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@...> 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