On Mon, 15 Oct 2007 12:52:26 -0700 (PDT), you wrote:
>
>I have done lots of photo resist stuff in the past.
>Pre 1995. But in about 1997 I picked up some supplies
>at a local dealer that served the retail/hobby
>community. The stuff I got from him did not work well.
>But beleive I did not expose it with a UV lamp. It did
>not say it needed UV. And I think it may have been
>DATAK stuff.
I think that stuff has improved a bit since then in terms of the
photoresist stuff.
>
>I have not done any PCBs since then.
>
>But next month I am going to try the stuff from MG
>Chemicals. Since I have to buy more board stock I
>might just as well buy the MG pre-coated stock. I only
>have one more un-cut 4X6 1/32" panel sot that's no
>great loss.
I've used MG chemicals stuff, it's good and works. Make sure you use
the proper exposure time as determined by a good exposure test.
Also, if you have any way of controlling the exposure on your laser
printer (assuming as if...) set it to as dense as possible. If you're
using something like kodalith or getting the negative made outside,
then that's not going to be a problem.
For the MG stuff, you'll need a positive pattern and a good way of
registering top to bottom, of course, if doing double sided.
>
>I am reluctant to invest much int the TT process as I
>already have an investment in the photo stuff. All I
>need is the board stock and developer. Everything else
>is the same.
Your investment in TT stuff would be a laminator of some sort. T-shirt
laminators are probably best, but I haven't used them. Next would be
a laminator you could modify and be wide enough for your board.
That could be as little as cheap at a salvage store or 150 dollars or
so.
The pulsar paper is 1.50 per sheet (roughly), or you could try various
other avenues for paper. YMMV a lot....
Photo produces nicer boards, but is more difficult to do, depending on
your resources.
There's some stuff at www.dragonworks.info on toner transfer as well
as the MG chemicals that you might want to look at.
Harvey
>
>Bob Macklin
>Seattle, Wa.