Chance of CD melting in hot climates?

Typically I will constantly forget to remove a CD from the player. In
my past the player was located at the bottom of the dash.
On the Sienna 06 it is near the top!
Any case of a CD melting or damaging the player in the hot south or
even north?

j

joe wrote:
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?

The melting point of polycarbonate is about 250 degrees C. Not to
worry.

"joe" <nospam@invalid.com> wrote in message
news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?
>
> j
>

Yes, a slim one.
--

Ray O
(correct punctuation to reply)

On Tue, 30 May 2006 19:34:47 GMT, "Travis Jordan" <no.one@no.net>
wrote:

>joe wrote:
>> Typically I will constantly forget to remove a CD from the player. In
>> my past the player was located at the bottom of the dash.
>> On the Sienna 06 it is near the top!
>> Any case of a CD melting or damaging the player in the hot south or
>> even north?
>
>The melting point of polycarbonate is about 250 degrees C. Not to
>worry.
>

Attempting to recall my properties of materials classes ...
I frequent Palm Springs, CA and 105 deg F is a rule and not the
exception. Air temp inside a car can get well over 150deg F and a
dark dash SHOULD NOT BE TOUCHED without welding type gloves - I will
make a wild guess north of 200degF.
So we have a melting point of 250 - 200 = a small spread. Between
solid and melting we have a very pliable stage ...
Perhaps there is no problem but a check in the real world is generally
a sound idea. If all else fails - ask the mechanic who has lived with
all the design mistakes <grin>.

j

joe wrote:
> Attempting to recall my properties of materials classes ...
> I frequent Palm Springs, CA and 105 deg F is a rule and not the
> exception. Air temp inside a car can get well over 150deg F and a
> dark dash SHOULD NOT BE TOUCHED without welding type gloves - I will
> make a wild guess north of 200degF.

> So we have a melting point of 250 - 200 = a small spread. Between
> solid and melting we have a very pliable stage ...

Um, no, the melting point is about 250 degrees C. As in Centigrade. Do
the math.

"joe" <nospam@invalid.com> wrote in message
news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?
>
> j
>

It is theoretically possible that the CD could warp just a bit on a very hot
day depending on how it is stored internally in the CD player. CD's spin a
very high speeds and even a slight warp could cause a problem.

Hopefully the CD player manufacturer has taken this into account, and the CD
is evenly supported so as not warp. I leave mine in all the time and have
never had a problem.

"Travis Jordan" <no.one@no.net> wrote in message
news:GY1fg.28067$Mg2.5952@fe08.news.easynews.com.. .
> Um, no, the melting point is about 250 degrees C. As in Centigrade. Do
> the math.
>

Melting point is not the same as bending point.

On Tue, 30 May 2006 14:35:48 -0600, "Mark A" <nobody@nowhere.com>
wrote:

>"joe" <nospam@invalid.com> wrote in message
>news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
>> Typically I will constantly forget to remove a CD from the player. In
>> my past the player was located at the bottom of the dash.
>> On the Sienna 06 it is near the top!
>> Any case of a CD melting or damaging the player in the hot south or
>> even north?
>>
>> j
>>
>
>It is theoretically possible that the CD could warp just a bit on a very hot
>day depending on how it is stored internally in the CD player. CD's spin a
>very high speeds and even a slight warp could cause a problem.
>
>Hopefully the CD player manufacturer has taken this into account, and the CD
>is evenly supported so as not warp. I leave mine in all the time and have
>never had a problem.
>

Travis you are correct C is not F sorry.
Mark - I have an "El Chepo" CD player at my desk where I can observe
the CD rotating. My guess is - very slowly in that I can almost read
the text on the CD as it is rotating.
What is the rpm - anybody?
j

"joe" <nospam@invalid.com> wrote in message
news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?
>
> j
>

Some here have said it's a hazard, but I used to live in Arizona, the
California desert, as well as my native Florida. I left CDs in the player
all the time, and never had a problem. The only time a CD melted was
outside the player.

Having said that, you should never use original CDs in your car; not only
because of the potential for damage, but also theft, should your car/truck
be stolen. A friend of mine's F-150 was stolen, along with about $300
worth of CDs. She was more heartbroken about that. (Even I think the
truck was more important...)

Natalie

It hasn't happened to me. I left a CD in the player of my motorhome without
any problem at all.





"joe" <nospam@invalid.com> wrote in message
news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?
>
> j
>

The speed of a CD varies depending on the diameter being read - faster
near the center and slower at the outer edge. I'm not sure but I think
it goes from 200 to 600 RPM.


---MIKE---
>>In the White Mountains of New Hampshire
>> (44° 15' N - Elevation 1580')

joe wrote:
> What is the rpm - anybody?


Not positive, but I think 1X for a CD is between 150 and 160 RPM.

"joe" <nospam@invalid.com> wrote in message
news:958p72lk3hckqu4nj4rh4nl03c8a4gqfa5@4ax.com...
> On Tue, 30 May 2006 19:34:47 GMT, "Travis Jordan" <no.one@no.net>
> wrote:
>
>>joe wrote:
>>> Typically I will constantly forget to remove a CD from the player. In
>>> my past the player was located at the bottom of the dash.
>>> On the Sienna 06 it is near the top!
>>> Any case of a CD melting or damaging the player in the hot south or
>>> even north?
>>
>>The melting point of polycarbonate is about 250 degrees C. Not to
>>worry.
>>
>
> Attempting to recall my properties of materials classes ...
> I frequent Palm Springs, CA and 105 deg F is a rule and not the
> exception. Air temp inside a car can get well over 150deg F and a
> dark dash SHOULD NOT BE TOUCHED without welding type gloves - I will
> make a wild guess north of 200degF.
> So we have a melting point of 250 - 200 = a small spread. Between
> solid and melting we have a very pliable stage ...
> Perhaps there is no problem but a check in the real world is generally
> a sound idea. If all else fails - ask the mechanic who has lived with
> all the design mistakes <grin>.
>
> j

It's safe to assume that the INSIDE of the CD player does not get to 250F.

"joe" <nospam@invalid.com> wrote in message
news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
> Typically I will constantly forget to remove a CD from the player. In
> my past the player was located at the bottom of the dash.
> On the Sienna 06 it is near the top!
> Any case of a CD melting or damaging the player in the hot south or
> even north?
>
> j
>

You're more likely to screw things up if you don't know there's a CD in the
player already.

mark_

"Mark A" <nobody@nowhere.com> wrote in message
news:0cOdnahUCLx-MOHZ4p2dnA@comcast.com...
> "Travis Jordan" <no.one@no.net> wrote in message
> news:GY1fg.28067$Mg2.5952@fe08.news.easynews.com.. .
>> Um, no, the melting point is about 250 degrees C. As in Centigrade. Do
>> the math.
>>
>
> Melting point is not the same as bending point.

250 C is over 480 F. Even if it could somehow get up to 250 F inside a
car CD player (way more than hot enough to boil water, and the parts of the
car in direct sunlight would have to be much hotter) it would still be 230
degrees colder than the melting point of polycarbonate. Usually, warping or
bending points are relatively close to melting points. I doubt it would
ever get up to 250C in the CD player, even in the middle of the Sahara on
summer solstice. Heat radiation and convection of the air (even if the air
is 130 degrees) would be very significant. But even if it did, the CD is
still 230 degrees cooler than melting point, so it probably hasn't even
started to soften at that point.

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:lPqdnQonq6hWfeHZnZ2dnUVZ_tidnZ2d@ez2.net...
>
> "joe" <nospam@invalid.com> wrote in message
> news:958p72lk3hckqu4nj4rh4nl03c8a4gqfa5@4ax.com...
>> On Tue, 30 May 2006 19:34:47 GMT, "Travis Jordan" <no.one@no.net>
>> wrote:
>>
>>>joe wrote:
>>>> Typically I will constantly forget to remove a CD from the player. In
>>>> my past the player was located at the bottom of the dash.
>>>> On the Sienna 06 it is near the top!
>>>> Any case of a CD melting or damaging the player in the hot south or
>>>> even north?
>>>
>>>The melting point of polycarbonate is about 250 degrees C. Not to
>>>worry.
>>>
>>
>> Attempting to recall my properties of materials classes ...
>> I frequent Palm Springs, CA and 105 deg F is a rule and not the
>> exception. Air temp inside a car can get well over 150deg F and a
>> dark dash SHOULD NOT BE TOUCHED without welding type gloves - I will
>> make a wild guess north of 200degF.
>> So we have a melting point of 250 - 200 = a small spread. Between
>> solid and melting we have a very pliable stage ...
>> Perhaps there is no problem but a check in the real world is generally
>> a sound idea. If all else fails - ask the mechanic who has lived with
>> all the design mistakes <grin>.
>>
>> j
>
> It's safe to assume that the INSIDE of the CD player does not get to 250F.


And even if it did, 250F is still 230F cooler than 250C.

"---MIKE---" <twinmountain@webtv.net> wrote in message
news:15672-447CD953-175@storefull-3251.bay.webtv.net...
The speed of a CD varies depending on the diameter being read - faster
near the center and slower at the outer edge. I'm not sure but I think
it goes from 200 to 600 RPM.


The RPM is the same for every part of the CD. If the outer edge of the CD
is at 600 RPM, the inner edge is also turning at 600 RPM.

The speed of the outer tracks is quite a it higher, even though they are
turning the same number of times per minute, because they have farther to go
to make one rev.

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5i42u.3uk.1@news.evilcabal.org...
>
> "joe" <nospam@invalid.com> wrote in message
> news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
>> Typically I will constantly forget to remove a CD from the player. In
>> my past the player was located at the bottom of the dash.
>> On the Sienna 06 it is near the top!
>> Any case of a CD melting or damaging the player in the hot south or
>> even north?
>>
>> j
>>
>
> Some here have said it's a hazard, but I used to live in Arizona, the
> California desert, as well as my native Florida. I left CDs in the player
> all the time, and never had a problem. The only time a CD melted was
> outside the player.


Where was that CD when it was melted?

Ernie Sty wrote:

>The RPM is the same for every part of
> the CD. If the outer edge of the CD is at
> 600 RPM, the inner edge is also turning
> at 600 RPM.

You are confused. Of course at any given time the whole CD is turning
at the same speed. My point is that at the beginning of the CD, when
the laser is reading the innermost track, the CD is turning much faster
than it will be when the laser is reading the last (outer) track. This
allows the size of the pips to stay the same over the entire disc.


---MIKE---
>>In the White Mountains of New Hampshire
>> (44° 15' N - Elevation 1580')

"---MIKE---" <twinmountain@webtv.net> wrote in message
news:26667-447E1A35-204@storefull-3255.bay.webtv.net...
Ernie Sty wrote:

>>The RPM is the same for every part of
>> the CD. If the outer edge of the CD is at
>> 600 RPM, the inner edge is also turning
>>at 600 RPM.

>You are confused. Of course at any given time the whole CD is turning
>at the same speed. My point is that at the beginning of the CD, when
>the laser is reading the innermost track, the CD is turning much faster
>than it will be when the laser is reading the last (outer) track. This
>allows the size of the pips to stay the same over the entire disc.

Which I said in the part of my post you chose not to quote. And you call ME
confused, LOL! :-)

"Ernie Sty" <fake_email@yahoo.com> wrote in message
news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
> news:e5i42u.3uk.1@news.evilcabal.org...
>>
>> "joe" <nospam@invalid.com> wrote in message
>> news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
>>> Typically I will constantly forget to remove a CD from the player. In
>>> my past the player was located at the bottom of the dash.
>>> On the Sienna 06 it is near the top!
>>> Any case of a CD melting or damaging the player in the hot south or
>>> even north?
>>>
>>> j
>>>
>>
>> Some here have said it's a hazard, but I used to live in Arizona, the
>> California desert, as well as my native Florida. I left CDs in the
>> player all the time, and never had a problem. The only time a CD melted
>> was outside the player.
>
>
> Where was that CD when it was melted?
>
On the seat

That happened in AZ. To be fair, it was a copy CD, not a factory one.
Maybe those are much cheesier

Natalie

"Ernie Sty" <fake_email@yahoo.com> wrote in message
news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>
>
> Where was that CD when it was melted?
>
In the oven, with the cookies.

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:4eednaRYRemL3OPZRVn-qA@ez2.net...
>
> "Ernie Sty" <fake_email@yahoo.com> wrote in message
> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>
>>
>> Where was that CD when it was melted?
>>
> In the oven, with the cookies.
>
>
>

*fwap*

Natalie

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5l4bl.1j0.1@news.evilcabal.org...
>
> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> news:4eednaRYRemL3OPZRVn-qA@ez2.net...
>>
>> "Ernie Sty" <fake_email@yahoo.com> wrote in message
>> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>>
>>>
>>> Where was that CD when it was melted?
>>>
>> In the oven, with the cookies.
>>
>>
>>
>
> *fwap*
>


Sticks and stones
can break my bones
but whips and chains
excite me.

"Ernie Sty" <fake_email@yahoo.com> wrote in message
news:Ldadndq1i65svePZnZ2dnUVZ_t6dnZ2d@giganews.com ...
>
> "---MIKE---" <twinmountain@webtv.net> wrote in message
> news:26667-447E1A35-204@storefull-3255.bay.webtv.net...
> Ernie Sty wrote:
>
>>>The RPM is the same for every part of
>>> the CD. If the outer edge of the CD is at
>>> 600 RPM, the inner edge is also turning
>>>at 600 RPM.
>
>>You are confused. Of course at any given time the whole CD is turning
>>at the same speed. My point is that at the beginning of the CD, when
>>the laser is reading the innermost track, the CD is turning much faster
>>than it will be when the laser is reading the last (outer) track. This
>>allows the size of the pips to stay the same over the entire disc.
>
> Which I said in the part of my post you chose not to quote. And you call
> ME confused, LOL! :-)
>

What part wasn't quoted? Mike's own statement you cut and pasted in your
first reply?mark_

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5kth1.3fc.1@news.evilcabal.org...
>
> "Ernie Sty" <fake_email@yahoo.com> wrote in message
> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>
>> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
>> news:e5i42u.3uk.1@news.evilcabal.org...
>>>
>>> "joe" <nospam@invalid.com> wrote in message
>>> news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
>>>> Typically I will constantly forget to remove a CD from the player. In
>>>> my past the player was located at the bottom of the dash.
>>>> On the Sienna 06 it is near the top!
>>>> Any case of a CD melting or damaging the player in the hot south or
>>>> even north?
>>>>
>>>> j
>>>>
>>>
>>> Some here have said it's a hazard, but I used to live in Arizona, the
>>> California desert, as well as my native Florida. I left CDs in the
>>> player all the time, and never had a problem. The only time a CD melted
>>> was outside the player.
>>
>>
>> Where was that CD when it was melted?
>>
> On the seat
>
> That happened in AZ. To be fair, it was a copy CD, not a factory one.
> Maybe those are much cheesier
>
> Natalie
>

Next you'll be telling us the pavement was so hot you could fry a CD on it,
which would be closer to reality than your dream.

mark_

"mark_digital©" <xxx976@comcast.com> wrote in message
news:ppSdnWHyqY8NH-PZnZ2dnUVZ_vydnZ2d@comcast.com...
>
> "Ernie Sty" <fake_email@yahoo.com> wrote in message
> news:Ldadndq1i65svePZnZ2dnUVZ_t6dnZ2d@giganews.com ...
>>
>> "---MIKE---" <twinmountain@webtv.net> wrote in message
>> news:26667-447E1A35-204@storefull-3255.bay.webtv.net...
>> Ernie Sty wrote:
>>
>>>>The RPM is the same for every part of
>>>> the CD. If the outer edge of the CD is at
>>>> 600 RPM, the inner edge is also turning
>>>>at 600 RPM.
>>
>>>You are confused. Of course at any given time the whole CD is turning
>>>at the same speed. My point is that at the beginning of the CD, when
>>>the laser is reading the innermost track, the CD is turning much faster
>>>than it will be when the laser is reading the last (outer) track. This
>>>allows the size of the pips to stay the same over the entire disc.
>>
>> Which I said in the part of my post you chose not to quote. And you call
>> ME confused, LOL! :-)
>>
>
> What part wasn't quoted? Mike's own statement you cut and pasted in your
> first reply?mark_


The part he didn't quote from my post he responded to was:

> The speed of the outer tracks is quite a it higher, even though they are
> turning the same number of times per minute, because they have farther to
> go to make one rev.

You can see it if you go back to my post.

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5kth1.3fc.1@news.evilcabal.org...
>
> "Ernie Sty" <fake_email@yahoo.com> wrote in message
> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>
>> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
>> news:e5i42u.3uk.1@news.evilcabal.org...
>>>
>>> "joe" <nospam@invalid.com> wrote in message
>>> news:ct6p72549icpcm6p2ueksvs977vnlkkaji@4ax.com...
>>>> Typically I will constantly forget to remove a CD from the player. In
>>>> my past the player was located at the bottom of the dash.
>>>> On the Sienna 06 it is near the top!
>>>> Any case of a CD melting or damaging the player in the hot south or
>>>> even north?
>>>>
>>>> j
>>>>
>>>
>>> Some here have said it's a hazard, but I used to live in Arizona, the
>>> California desert, as well as my native Florida. I left CDs in the
>>> player all the time, and never had a problem. The only time a CD melted
>>> was outside the player.
>>
>>
>> Where was that CD when it was melted?
>>
> On the seat
>
> That happened in AZ. To be fair, it was a copy CD, not a factory one.
> Maybe those are much cheesier


I think they're made of a completely different type of plastic. Not 100%
sure though.

>> Where was that CD when it was melted?
>>
> On the seat
>
> That happened in AZ. To be fair, it was a copy CD, not a factory one. Maybe those are much cheesier
>
> Natalie


We spend a lot of time at the river in Parker Arizona. In the summer it is not safe to leave a CD anywhere
in a car with the windows up there. Anything like that has almost no chance. Well maybe in a nice hard back case under the seat and
some luck.

Keep in mind 120F degree days are not unusual there.

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:kpidnRYam6Ku0uPZ4p2dnA@ez2.net...
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
> news:e5l4bl.1j0.1@news.evilcabal.org...
>>
>> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
>> news:4eednaRYRemL3OPZRVn-qA@ez2.net...
>>>
>>> "Ernie Sty" <fake_email@yahoo.com> wrote in message
>>> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>>>
>>>>
>>>> Where was that CD when it was melted?
>>>>
>>> In the oven, with the cookies.
>>>
>>>
>>>
>>
>> *fwap*
>>
>
>
> Sticks and stones
> can break my bones
> but whips and chains
> excite me.

Deviant

Natalie

"mark_digital©" ..
>
> "Wickeddoll®" ...
>>
>> "Ernie Sty" ...
>>>
>>> "Wickeddoll®" ...
>>>>
>>>> "joe" ...
>>>>> Typically I will constantly forget to remove a CD from the player.
>>>>> In
>>>>> my past the player was located at the bottom of the dash.
>>>>> On the Sienna 06 it is near the top!
>>>>> Any case of a CD melting or damaging the player in the hot south or
>>>>> even north?
>>>>>
>>>>> j
>>>>>
>>>>
>>>> Some here have said it's a hazard, but I used to live in Arizona, the
>>>> California desert, as well as my native Florida. I left CDs in the
>>>> player all the time, and never had a problem. The only time a CD
>>>> melted was outside the player.
>>>
>>>
>>> Where was that CD when it was melted?
>>>
>> On the seat
>>
>> That happened in AZ. To be fair, it was a copy CD, not a factory one.
>> Maybe those are much cheesier
>>
>> Natalie
>>
>
> Next you'll be telling us the pavement was so hot you could fry a CD on
> it, which would be closer to reality than your dream.
>
> mark_

What dream? The thing melted.

Natalie

"Danny G." <dandog@pacbell.net> wrote in message
news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>> Where was that CD when it was melted?
>>>
>> On the seat
>>
>> That happened in AZ. To be fair, it was a copy CD, not a factory one.
>> Maybe those are much cheesier
>>
>> Natalie
>
>
> We spend a lot of time at the river in Parker Arizona. In the summer it
> is not safe to leave a CD anywhere
> in a car with the windows up there. Anything like that has almost no
> chance. Well maybe in a nice hard back case under the seat and some luck.
>
> Keep in mind 120F degree days are not unusual there.
>
>
>
Maybe you can convince Mark D that they really do melt there.

*rolling eyes*

Natalie

Ernie Sty wrote:

>The part he didn't quote from my post he
> responded to was:

>>The speed of the outer tracks is quite a
>> it higher, even though they are turning
>> the same number of times per minute,
>> because they have farther to go to
>> make one rev.

>You can see it if you go back to my post.

You are still confused. The speed of the outer tracks is LOWER when
being read because the RPM of the disk is slowed down (200 RPM?). The
inner tracks are read at a higher speed (600 RPM?). Effectively,
because of the speed change, the size and frequency of the pits
representing the data stays constant throughout the disc. The speed
change occurs gradually as the disc is being read.


---MIKE---
>>In the White Mountains of New Hampshire
>> (44° 15' N - Elevation 1580')

This was copied from google-

The disc is rotated by a drive system that regulates the speed of
rotation so that data is read at the same speed regardless of the laser
detector's position. This means that rotation speed decreases as the
laser detector slowly traverses from the center to the periphery of the
disc in order to maintain a constant rate of data acquisition


---MIKE---
>>In the White Mountains of New Hampshire
>> (44° 15' N - Elevation 1580')

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5nb2l.1pg.1@news.evilcabal.org...
>
> "Danny G." <dandog@pacbell.net> wrote in message
> news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>>> Where was that CD when it was melted?
>>>>
>>> On the seat
>>>
>>> That happened in AZ. To be fair, it was a copy CD, not a factory one.
>>> Maybe those are much cheesier
>>>
>>> Natalie
>>
>>
>> We spend a lot of time at the river in Parker Arizona. In the summer it
>> is not safe to leave a CD anywhere
>> in a car with the windows up there. Anything like that has almost no
>> chance. Well maybe in a nice hard back case under the seat and some luck.
>>
>> Keep in mind 120F degree days are not unusual there.
>>
>>
>>
> Maybe you can convince Mark D that they really do melt there.
>
> *rolling eyes*
>
> Natalie
>

I did a little research and here's what I found:

"Polycarbonate has outstanding dimensional stability up to 130oC. For glass
fibre reinforced grades this value is raised to 140oC. Above these
temperatures polycarbonate begins to soften. From about 220oC melting
commences, reaching a state of flow at 240-260oC, which permits processing
by injection moulding or extrusion."
Ok, 130 C is 266F. I think I could see a direct surface inside a glassed-in
area like a car getting up to that temperature when exposed to direct
sunlight. It's a bit of a stretch, though. Even if it's 130 degrees
outside, that's still 136 degrees over ambient air temperature, but I will
not rule it out because I have never been in Arizona in the summer so I
don't have enough experience to really know.

Now, the report says that outstanding dimensional stability up to 130oC, so
that means that at 266 degrees it has not started to soften yet. Above that
temperature it starts to soften.

How hot do flat surfaces exposed to the sun get in Arizona? Has anyone
gathered data on this? 266 degrees is more than hot enough to boil water,
you'd think there would be nothing to setting up a solar-powered
steam-driven electricity generator.

When you guys say that the CDs melted, do you mean they got soft and warped
or wilted out of shape, or that they turned to liquid? I can buy them
getting soft enough to bend or warp but actually melting completely into
free-flowing liquid would take a lot more heat than I'd believe could be
generated by the sun (without help like lenses or mirrors.)

"---MIKE---" <twinmountain@webtv.net> wrote in message
news:20128-447F68BC-1067@storefull-3252.bay.webtv.net...
Ernie Sty wrote:



>You are still confused. The speed of the outer tracks is LOWER when
>being read because the RPM of the disk is slowed down (200 RPM?). The
>inner tracks are read at a higher speed (600 RPM?). Effectively,
>because of the speed change, the size and frequency of the pits
>representing the data stays constant throughout the disc. The speed
>change occurs gradually as the disc is being read.


---MIKE---
>>In the White Mountains of New Hampshire
>> (44° 15' N - Elevation 1580')


I see! In your post, "you're confused" means "you misunderstood what I was
trying to say." After I re-read and eventually deciphered your original
post, I realize that we are both saying basically the same things.

"Ernie Sty" <fake_email@yahoo.com> wrote in message
news:gZ6dnd81xKvm5uLZnZ2dnUVZ_smdnZ2d@giganews.com ...
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
> news:e5nb2l.1pg.1@news.evilcabal.org...
>>
>> "Danny G." <dandog@pacbell.net> wrote in message
>> news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>>>> Where was that CD when it was melted?
>>>>>
>>>> On the seat
>>>>
>>>> That happened in AZ. To be fair, it was a copy CD, not a factory one.
>>>> Maybe those are much cheesier
>>>>
>>>> Natalie
>>>
>>>
>>> We spend a lot of time at the river in Parker Arizona. In the summer it
>>> is not safe to leave a CD anywhere
>>> in a car with the windows up there. Anything like that has almost no
>>> chance. Well maybe in a nice hard back case under the seat and some
>>> luck.
>>>
>>> Keep in mind 120F degree days are not unusual there.
>>>
>>>
>>>
>> Maybe you can convince Mark D that they really do melt there.
>>
>> *rolling eyes*
>>
>> Natalie
>>
>
> I did a little research and here's what I found:
>
> "Polycarbonate has outstanding dimensional stability up to 130oC. For
> glass fibre reinforced grades this value is raised to 140oC. Above these
> temperatures polycarbonate begins to soften. From about 220oC melting
> commences, reaching a state of flow at 240-260oC, which permits
> processing by injection moulding or extrusion."
> Ok, 130 C is 266F. I think I could see a direct surface inside a
> glassed-in area like a car getting up to that temperature when exposed to
> direct sunlight. It's a bit of a stretch, though. Even if it's 130
> degrees outside, that's still 136 degrees over ambient air temperature,
> but I will not rule it out because I have never been in Arizona in the
> summer so I don't have enough experience to really know.
>
> Now, the report says that outstanding dimensional stability up to 130oC,
> so that means that at 266 degrees it has not started to soften yet.
> Above that temperature it starts to soften.
>
> How hot do flat surfaces exposed to the sun get in Arizona? Has anyone
> gathered data on this? 266 degrees is more than hot enough to boil
> water, you'd think there would be nothing to setting up a solar-powered
> steam-driven electricity generator.
>
> When you guys say that the CDs melted, do you mean they got soft and
> warped or wilted out of shape, or that they turned to liquid? I can buy
> them getting soft enough to bend or warp but actually melting completely
> into free-flowing liquid would take a lot more heat than I'd believe
> could be generated by the sun (without help like lenses or mirrors.)
>

Mine only warped, but it may has well have turned to liquid, since it was
unplayable

:-)

Natalie

"Ernie Sty" <fake_email@yahoo.com> wrote in message news:gZ6dnd81xKvm5uLZnZ2dnUVZ_smdnZ2d@giganews.com ...
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message news:e5nb2l.1pg.1@news.evilcabal.org...
>>
>> "Danny G." <dandog@pacbell.net> wrote in message news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>>>> Where was that CD when it was melted?
>>>>>
>>>> On the seat
>>>>
>>>> That happened in AZ. To be fair, it was a copy CD, not a factory one. Maybe those are much cheesier
>>>>
>>>> Natalie
>>>
>>>
>>> We spend a lot of time at the river in Parker Arizona. In the summer it is not safe to leave a CD anywhere
>>> in a car with the windows up there. Anything like that has almost no chance. Well maybe in a nice hard back case under the seat
>>> and some luck.
>>>
>>> Keep in mind 120F degree days are not unusual there.
>>>
>>>
>>>
>> Maybe you can convince Mark D that they really do melt there.
>>
>> *rolling eyes*
>>
>> Natalie
>>
>
> I did a little research and here's what I found:
>
> "Polycarbonate has outstanding dimensional stability up to 130oC. For glass fibre reinforced grades this value is raised to 140oC.
> Above these temperatures polycarbonate begins to soften. From about 220oC melting commences, reaching a state of flow at
> 240-260oC, which permits processing by injection moulding or extrusion."
> Ok, 130 C is 266F. I think I could see a direct surface inside a glassed-in area like a car getting up to that temperature when
> exposed to direct sunlight. It's a bit of a stretch, though. Even if it's 130 degrees outside, that's still 136 degrees over
> ambient air temperature, but I will not rule it out because I have never been in Arizona in the summer so I don't have enough
> experience to really know.
>
> Now, the report says that outstanding dimensional stability up to 130oC, so that means that at 266 degrees it has not started to
> soften yet. Above that temperature it starts to soften.
>
> How hot do flat surfaces exposed to the sun get in Arizona? Has anyone gathered data on this? 266 degrees is more than hot
> enough to boil water, you'd think there would be nothing to setting up a solar-powered steam-driven electricity generator.
>
> When you guys say that the CDs melted, do you mean they got soft and warped or wilted out of shape, or that they turned to liquid?
> I can buy them getting soft enough to bend or warp but actually melting completely into free-flowing liquid would take a lot more
> heat than I'd believe could be generated by the sun (without help like lenses or mirrors.)
>
>



I don't actually remember the CD so maybe not. I don't even have a car CD player.
I did melt my damm portable radio it was in but so many things meet that fate.



I can hardly believe that I still remember this from so long ago. So don't hold me to it.

Solar energy from the sun into a black surface, right angle's, at the equator.
Energy 330 Btu per hour. per sq. ft.
Temperature direct 250f degree
Temperature trapped behind glass 620f degree

Dan

> Mine only warped, but it may has well have turned to liquid, since it was unplayable
>


I should have said warped or some word other than melt as well.

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5nlcr.3mo.1@news.evilcabal.org...
>
> "Ernie Sty" <fake_email@yahoo.com> wrote in message
> news:gZ6dnd81xKvm5uLZnZ2dnUVZ_smdnZ2d@giganews.com ...
>>
>> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
>> news:e5nb2l.1pg.1@news.evilcabal.org...
>>>
>>> "Danny G." <dandog@pacbell.net> wrote in message
>>> news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>>>>> Where was that CD when it was melted?
>>>>>>
>>>>> On the seat
>>>>>
>>>>> That happened in AZ. To be fair, it was a copy CD, not a factory one.
>>>>> Maybe those are much cheesier
>>>>>
>>>>> Natalie
>>>>
>>>>
>>>> We spend a lot of time at the river in Parker Arizona. In the summer it
>>>> is not safe to leave a CD anywhere
>>>> in a car with the windows up there. Anything like that has almost no
>>>> chance. Well maybe in a nice hard back case under the seat and some
>>>> luck.
>>>>
>>>> Keep in mind 120F degree days are not unusual there.
>>>>
>>>>
>>>>
>>> Maybe you can convince Mark D that they really do melt there.
>>>
>>> *rolling eyes*
>>>
>>> Natalie
>>>
>>
>> I did a little research and here's what I found:
>>
>> "Polycarbonate has outstanding dimensional stability up to 130oC. For
>> glass fibre reinforced grades this value is raised to 140oC. Above these
>> temperatures polycarbonate begins to soften. From about 220oC melting
>> commences, reaching a state of flow at 240-260oC, which permits
>> processing by injection moulding or extrusion."
>> Ok, 130 C is 266F. I think I could see a direct surface inside a
>> glassed-in area like a car getting up to that temperature when exposed to
>> direct sunlight. It's a bit of a stretch, though. Even if it's 130
>> degrees outside, that's still 136 degrees over ambient air temperature,
>> but I will not rule it out because I have never been in Arizona in the
>> summer so I don't have enough experience to really know.
>>
>> Now, the report says that outstanding dimensional stability up to 130oC,
>> so that means that at 266 degrees it has not started to soften yet. Above
>> that temperature it starts to soften.
>>
>> How hot do flat surfaces exposed to the sun get in Arizona? Has anyone
>> gathered data on this? 266 degrees is more than hot enough to boil
>> water, you'd think there would be nothing to setting up a solar-powered
>> steam-driven electricity generator.
>>
>> When you guys say that the CDs melted, do you mean they got soft and
>> warped or wilted out of shape, or that they turned to liquid? I can buy
>> them getting soft enough to bend or warp but actually melting completely
>> into free-flowing liquid would take a lot more heat than I'd believe
>> could be generated by the sun (without help like lenses or mirrors.)
>>
>
> Mine only warped, but it may has well have turned to liquid, since it was
> unplayable
>
> :-)
>
> Natalie
>

Well, that certainly didn't take long. I was about ready to ask if you like
soft butter in your popcorn or would you really like it thoroughly melted.

mark_

"mark_digital©" <xxx976@comcast.com> wrote in message
news:vrqdna0BiJsgtR3ZnZ2dneKdnZydnZ2d@comcast.com. ..
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
> news:e5nlcr.3mo.1@news.evilcabal.org...
>>
>> "Ernie Sty" <fake_email@yahoo.com> wrote in message
>> news:gZ6dnd81xKvm5uLZnZ2dnUVZ_smdnZ2d@giganews.com ...
>>>
>>> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
>>> news:e5nb2l.1pg.1@news.evilcabal.org...
>>>>
>>>> "Danny G." <dandog@pacbell.net> wrote in message
>>>> news:75Ifg.32824$fb2.27400@newssvr27.news.prodigy. net...
>>>>>>> Where was that CD when it was melted?
>>>>>>>
>>>>>> On the seat
>>>>>>
>>>>>> That happened in AZ. To be fair, it was a copy CD, not a factory
>>>>>> one. Maybe those are much cheesier
>>>>>>
>>>>>> Natalie
>>>>>
>>>>>
>>>>> We spend a lot of time at the river in Parker Arizona. In the summer
>>>>> it is not safe to leave a CD anywhere
>>>>> in a car with the windows up there. Anything like that has almost no
>>>>> chance. Well maybe in a nice hard back case under the seat and some
>>>>> luck.
>>>>>
>>>>> Keep in mind 120F degree days are not unusual there.
>>>>>
>>>>>
>>>>>
>>>> Maybe you can convince Mark D that they really do melt there.
>>>>
>>>> *rolling eyes*
>>>>
>>>> Natalie
>>>>
>>>
>>> I did a little research and here's what I found:
>>>
>>> "Polycarbonate has outstanding dimensional stability up to 130oC. For
>>> glass fibre reinforced grades this value is raised to 140oC. Above these
>>> temperatures polycarbonate begins to soften. From about 220oC melting
>>> commences, reaching a state of flow at 240-260oC, which permits
>>> processing by injection moulding or extrusion."
>>> Ok, 130 C is 266F. I think I could see a direct surface inside a
>>> glassed-in area like a car getting up to that temperature when exposed
>>> to direct sunlight. It's a bit of a stretch, though. Even if it's 130
>>> degrees outside, that's still 136 degrees over ambient air temperature,
>>> but I will not rule it out because I have never been in Arizona in the
>>> summer so I don't have enough experience to really know.
>>>
>>> Now, the report says that outstanding dimensional stability up to 130oC,
>>> so that means that at 266 degrees it has not started to soften yet.
>>> Above that temperature it starts to soften.
>>>
>>> How hot do flat surfaces exposed to the sun get in Arizona? Has anyone
>>> gathered data on this? 266 degrees is more than hot enough to boil
>>> water, you'd think there would be nothing to setting up a solar-powered
>>> steam-driven electricity generator.
>>>
>>> When you guys say that the CDs melted, do you mean they got soft and
>>> warped or wilted out of shape, or that they turned to liquid? I can buy
>>> them getting soft enough to bend or warp but actually melting completely
>>> into free-flowing liquid would take a lot more heat than I'd believe
>>> could be generated by the sun (without help like lenses or mirrors.)
>>>
>>
>> Mine only warped, but it may has well have turned to liquid, since it was
>> unplayable
>>
>> :-)
>>
>> Natalie
>>
>
> Well, that certainly didn't take long. I was about ready to ask if you
> like soft butter in your popcorn or would you really like it thoroughly
> melted.
>
> mark_

This is all too deep for me, my Toyota manual said remove the disc when
not in use. I don't do it either.
>
>

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5nauv.vk.1@news.evilcabal.org...
>
> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> news:kpidnRYam6Ku0uPZ4p2dnA@ez2.net...
>>
>> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
>> news:e5l4bl.1j0.1@news.evilcabal.org...
>>>
>>> "Jeff Strickland" <crwlr@yahoo.com> wrote in message
>>> news:4eednaRYRemL3OPZRVn-qA@ez2.net...
>>>>
>>>> "Ernie Sty" <fake_email@yahoo.com> wrote in message
>>>> news:tcCdndsmEYOUY-DZnZ2dnUVZ_vmdnZ2d@giganews.com...
>>>>>
>>>>>
>>>>> Where was that CD when it was melted?
>>>>>
>>>> In the oven, with the cookies.
>>>>
>>>>
>>>>
>>>
>>> *fwap*
>>>
>>
>>
>> Sticks and stones
>> can break my bones
>> but whips and chains
>> excite me.
>
> Deviant
>
> Natalie


Crap! I was hoping you would treat me to a *double fwap*

"Jeff Strickland" ...
>
> "Wickeddoll®" ...
>>
>>>>> "Ernie Sty" ...
>>>>>>
>>>>>>
>>>>>> Where was that CD when it was melted?
>>>>>>
>>>>> In the oven, with the cookies.
>>>>>
>>>>>
>>>>>
>>>>
>>>> *fwap*
>>>>
>>>
>>>
>>> Sticks and stones
>>> can break my bones
>>> but whips and chains
>>> excite me.
>>
>> Deviant
>>
>> Natalie
>
>
> Crap! I was hoping you would treat me to a *double fwap*

Sure thing

*fwappity fwap*

Natalie, aiming to please

"Charlie" <tigerstwo-invalid@comcast.net> wrote in message
news:-rWdnZ3UErcIoh3ZnZ2dnUVZ_vydnZ2d@comcast.com...
> This is all too deep for me, my Toyota manual said remove the disc when
> not in use. I don't do it either.
>>

Many of my discs have no markings on them. They have to go back in their
storage cases or sleeves or things get out of hand.
mark_

"Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
news:e5q2me.3v4.1@news.evilcabal.org...
>
> "Jeff Strickland" ...
>>
>> "Wickeddoll®" ...
>>>
>>>>>> "Ernie Sty" ...
>>>>>>>
>>>>>>>
>>>>>>> Where was that CD when it was melted?
>>>>>>>
>>>>>> In the oven, with the cookies.
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> *fwap*
>>>>>
>>>>
>>>>
>>>> Sticks and stones
>>>> can break my bones
>>>> but whips and chains
>>>> excite me.
>>>
>>> Deviant
>>>
>>> Natalie
>>
>>
>> Crap! I was hoping you would treat me to a *double fwap*
>
> Sure thing
>
> *fwappity fwap*
>
> Natalie, aiming to please
>

Oh baby!

Shhh, my wife's coming. she's been to the Lorena Bobitt School of Conflict
Resolution.

On Tue, 30 May 2006 19:54:48 GMT, joe <nospam@invalid.com> wrote:

>On Tue, 30 May 2006 19:34:47 GMT, "Travis Jordan" <no.one@no.net>
>wrote:
>
>>joe wrote:
>>> Typically I will constantly forget to remove a CD from the player. In
>>> my past the player was located at the bottom of the dash.
>>> On the Sienna 06 it is near the top!
>>> Any case of a CD melting or damaging the player in the hot south or
>>> even north?
>>
>>The melting point of polycarbonate is about 250 degrees C. Not to
>>worry.
>>
>
>Attempting to recall my properties of materials classes ...
>I frequent Palm Springs, CA and 105 deg F is a rule and not the
>exception. Air temp inside a car can get well over 150deg F and a
>dark dash SHOULD NOT BE TOUCHED without welding type gloves - I will
>make a wild guess north of 200degF.
>So we have a melting point of 250 - 200 = a small spread. Between

the actual (black) surface might reach that temp, below it I am sure
it is not as hot. Here in Phoenix Arizona we have a looooooooong
hoooooot summer and I've never had cd's melt in the player. I think it
only happens if you leave them ON the dash or in direct sun light.


>solid and melting we have a very pliable stage ...
>Perhaps there is no problem but a check in the real world is generally
>a sound idea. If all else fails - ask the mechanic who has lived with
>all the design mistakes <grin>.
>
>j

"Jeff Strickland" <crwlr@yahoo.com> wrote in message
news:Ns-dnTl_GeXLeBzZnZ2dneKdnZydnZ2d@ez2.net...
>
> "Wickeddoll®" <wickeddoll1958DIEspammersDIE@yahoo.com> wrote in message
> news:e5q2me.3v4.1@news.evilcabal.org...
>>
>> "Jeff Strickland" ...
>>>
>>> "Wickeddoll®" ...
>>>>
>>>>>>> "Ernie Sty" ...
>>>>>>>>
>>>>>>>>
>>>>>>>> Where was that CD when it was melted?
>>>>>>>>
>>>>>>> In the oven, with the cookies.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>> *fwap*
>>>>>>
>>>>>
>>>>>
>>>>> Sticks and stones
>>>>> can break my bones
>>>>> but whips and chains
>>>>> excite me.
>>>>
>>>> Deviant
>>>>
>>>> Natalie
>>>
>>>
>>> Crap! I was hoping you would treat me to a *double fwap*
>>
>> Sure thing
>>
>> *fwappity fwap*
>>
>> Natalie, aiming to please
>>
>
> Oh baby!
>
> Shhh, my wife's coming. she's been to the Lorena Bobitt School of
> Conflict Resolution.
>
>
>

LOL - I think old Lorena should dole out punishment to sex offenders...

Natalie