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

[Dave Leith]

It does not look like conformal coating and it seems much thicker....I
was looking at one where part of it had worn through.

On Tue, Nov 13, 2012 at 7:47 PM, Dave Manley <dlmanley at sonic.net> wrote:
> Is it nothing more than soldermask?
>
> -Dave
>
> -------- Original Message --------
>  From: Jay Schwichtenberg <jays at aracnet.com>
>  Sent: Tue, Nov 13, 2012 07:30 PM
>  To: 'SDIY' <synth-diy at dropmix.xs4all.nl>
>  CC:
>  Subject: Re: [sdiy] Help! What protective coating on older Buchla touch        keyboards
>
>>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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