Crankorgan,
Putting bluing on the whole board, then scratching it off with a
carbide metal scratch tip is the method I'm currently using to do boards. I
tape the copper down on a piece of paper, then run it through my HP plotter
(7550A). I get very clean lines and can get down to 10mil space 10mil line
with a bit of practice, double sided. I've written custom software to take a
Eagle board file and create HPGL which I then output to the plotter. This
method really works well since you can use a standard plotter (I just built
a special 'pen' with the carbide scratch tip) plus some software. Anyway,
the bluing/scratching method is alive and well . . .
∗Brian
-----Original Message-----
From: crankorgan [mailto:
john@...]
Sent: Saturday, September 14, 2002 6:41 AM
To:
Homebrew_PCBs@yahoogroups.comSubject: [Homebrew_PCBs] Re: Inkjet printing PC boards
Larry,
I sell plans for a PCBmill (Brute) and I just finished a
machine that will mill or draw simple boards. (Morph)
Months ago I brought up the idea of Scratch and Etch. This
idea is not dead. First I developed a super simple CNC plotter. Now
I have a machine strong enough to drag a scribe through the blueing.
Several people tried Scratch and Etch With good results. Coating the
whole board and then scribing and isolation between pads for etching
seems easier.
Crankorgan John