[sdiy] Help! What protective coating on older Buchla touch keyboards

[mark verbos]

I don't know what it is, but I have been told that it is old world toxic stuff that you can no longer buy. Of course, that is hear-say.

:)


Mark




On Nov 13, 2012, at 10:30 PM, Jay Schwichtenberg wrote:

> Dave,
> 
> I was wondering about something simular. I have some clear, matt (dull surface) contact paper (adheasive on one side) that is used to cover photos, posters and things like that. While it would wear out after a while at least it would be replacable.
> 
> Might see if Mark Verbos might know what the coating is on the keyboards. He has done a lot of restore work and cloning of Buchla gear.
> 
> Jay S.
> 
> -----Original Message-----
> From: Dave Leith [mailto:dave.leith at gmail.com] 
> Sent: Tuesday, November 13, 2012 6:05 PM
> To: jays at aracnet.com
> Cc: SDIY
> Subject: Re: [sdiy] Help! What protective coating on older Buchla touch keyboards
> 
> Thanks for the replies.
> 
> Yes, it does seem to be very hard and like an epoxy and I would like
> to "paint once calibrate twice" rather than have to try and remove a
> wrong material which would probably be impossible. I am almost
> wondering if something like a baked on lazertran (for doing front
> panels)  might be a good substitute. A sheet of overhead slide
> transparency seems to have the right characteristics and gives both a
> good sensitivity and triggering.
> 
> I wonder if any of the Buchla experts knows the answer.
> 
> Dave
> 
> On Mon, Nov 12, 2012 at 11:39 AM,  <jays at aracnet.com> wrote:
>> To me it seems more like some form of resin/epoxy. On the 112 that I
>> have (in the process of being refurbished) it looks to be something that
>> is about 1/32 to 1/16 thick and is solid.
>> 
>> Jay S.
>> 
>> 
>> On Mon, 12 Nov 2012 09:58:54 -0800, Dave Leith <dave.leith at gmail.com>
>> wrote:
>>> Does anyone know what coating was painted over an older Buchla Touch
>>> Keyboard (like the 216 or 112)?
>>> 
>>> The circuit seems to be sensitive to what material was used. Too thick
>>> is OK for pressure sensitivity but poor for triggering, no coating has
>>> good triggering but no real finger pressure range.
>>> 
>>> Thanks Dave
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>> 
>> 
> 
> 
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