[78-L] My way of flattening warped shellac78s (was Clamp Them

[Ron L]

Maybe the flattening device shown allows the whole disk to expand and
flatten in the process, making a slightly larger but playable disk?  Someone
with the device should do the experiment.

Ron L

-----Original Message-----
From: 78-l-bounces at klickitat.78online.com
[mailto:78-l-bounces at klickitat.78online.com] On Behalf Of Steven C. Barr
Sent: Sunday, April 26, 2009 11:56 PM
To: 78-L Mail List
Subject: Re: [78-L] My way of flattening warped shellac78s (was Clamp Them

----- Original Message ----- 
From: "Nipper" <nipper at infionline.net>
> Yep.  Can work nicely for shellac though I haven't tried it with vinyl. 
> I'd
> think that it would help although the "groove guard" and/or "raised label"
> profiles of most US 12 and 7 inch releases would hinder perfect results in
> most cases.
>
Flattening warped vinyl records is effectively impossible (AFAIK, anyway)!
Vinyl discs physically expand when heated...so that the "warping" is 
actually
caused by expansion that had nowhere else to go, except raising a section
of the vinyl disc. Since the vinyl does NOT shrink when cooled, this warpage
is effectively permanent...!!

OTOH, shellac discs "warp" when stored in conditions that neccessitate the
record bending (aka "warping") when the disc becomes malleable due to
inappropriate heat (like, in my case, leaving a dozen or so 78's on the
black-upholstered seat of a convertible ['58 Impala, BTW!!]on a sunny
Florida afternoon!!). Fortunately, they were still malleable when I 
discovered
the "damage"...!

...stevenc 

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