Homebrew PCBs

Rick

A while ago I had some samples of Auxetic foam gasket material that I used on a pumping system. It is peculiar stuff in that if you stretch it it grows in diameter and if you squash it, when using it as a gasket, it expands to fill all the voids. Clamped between the band and the transfer sheet it would ensure even pressure distribution.

See:
<http://www.youtube.com/watch?v=PLDbSWSm5i8> for an explanation.
I can't remember who made it but it was reasonably priced.

An alternative would be to use a rubber gasket material.

Malcolm

I don't suffer from insanity I enjoy it!
Mene, mene, tekel, upharsin
The writing is on the wall.
Ha-ktovet al ha-kir

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On Thu, 8/15/13, Rick Sparber <rgsparber@aol.com> wrote:

 Subject: RE: [Homebrew_PCBs] Re: Easy Fast Laser Print DIY Circuit  Boards - Dave's toner-transfer freezing technique
 To: Homebrew_PCBs@yahoogroups.com
 Date: Thursday, August 15, 2013, 3:07 PM
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
   
 
 
     
       
       
       Once I got into my shop I realized that the wax
 paper would stop any acetone
 
 vapor or even liquid. So I went with plan B and clamped the
 artwork with a
 
 hose clamp. Then I applied heat using an industrial heat
 gun. I used a scrap
 
 of paper with toner on it to tell me when the metal was hot
 enough. Then I
 
 put the copper pipe in the freezer for 30 minutes. The
 clamping force was
 
 not uniform. Most of the toner did not stick. In a few
 places it squished
 
 out and left fragments. Where the toner did stick, it is on
 securely. I
 
 really do not want to build a custom machine just to mimic
 what a laminator
 
 does so well. Suggestions?
 
 
 
 One rather distasteful idea is to put the artwork on a strip
 of copper, etch
 
 it, and then form it into a cylinder. Solder could be used
 to secure it.
 
 Even with a precision beveled joint, it would be obvious.
 
 
 
 Rick
 
 
 
 -----Original Message-----
 
 From: Homebrew_PCBs@yahoogroups.com
 [mailto:Homebrew_PCBs@yahoogroups.com]
 
 On Behalf Of Rick Sparber
 
 Sent: Wednesday, August 14, 2013 4:09 PM
 
 To: Homebrew_PCBs@yahoogroups.com
 
 Subject: RE: [Homebrew_PCBs] Re: Easy Fast Laser Print DIY
 Circuit Boards -
 
 Dave's toner-transfer freezing technique
 
 
 
 Mark,
 
 
 
 Excellent idea! I'm on it.
 
 
 
 Thanks,
 
 
 
 Rick
 
 
 
 -----Original Message-----
 
 From: Homebrew_PCBs@yahoogroups.com
 [mailto:Homebrew_PCBs@yahoogroups.com]
 
 On Behalf Of Mark Lerman
 
 Sent: Wednesday, August 14, 2013 2:13 PM
 
 To: Homebrew_PCBs@yahoogroups.com
 
 Subject: RE: [Homebrew_PCBs] Re: Easy Fast Laser Print DIY
 Circuit Boards -
 
 Dave's toner-transfer freezing technique
 
 
 
 Rick,
 
 
 
 You might want to try using an acetone vapor chamber. Wrap
 the toner around
 
 the pipe, perhaps taping it to the pipe, then let it sit in
 acetone vapor
 
 for a few minutes. Maybe from there into the freezer for a
 half hour. Just a
 
 thought.
 
 
 
 Mark