Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Using my CNC machine, I made my first attept at resist scribing. For
a resist I used Dykem (commonly referred to as machinist bluing). I
then machined up a spring loaded scribe that would fit in my
spindle. From that point on, it works as if you are doing isolation
milling.

It didn't work as well as I had hoped, but that is not to say there
is any specific reason why it wont work. There were atleast two
problems I oberved from watching the process.

1) My machine is moving a bit too fast for it to complete each move
before moving onto the next position. This is a constant velocity
routine I need to tweak more in my motion control software. I also
had it moving at 40IPM during the motions. I will be trying lower
velocities to see how the motions differ from the higher velcities.

2) The scribe I machined up has just a bit too much slop in it. I
decided to go with a spring loaded scribe so that it would handle
variations in either the macines table or even the stock thickness.
The problem is I bored the mating hole a bit too big in the holder
so I will have to make another one or try to stake the hole so it
fits a bit tighter.

Chris