[chbot] PCBs again

[Andrew Errington]

Hi everyone,

After the recent excitement about PCB milling machines I have to add some more 
comments about the toner-transfer method.

I made five more small boards this afternoon, and the toner adhesion was much 
better.  I have dropped the iron temperature a little, and I am putting less 
pressure on it.  Also, I used a tip I found on the Internet: after cleaning 
the copper-clad board drop it into the etching solution for a few seconds.  
This etches the surface of the copper and makes the toner stick better.

I still had to fix a few traces with a Sharpie, but last time I had to clean 
the toner off several times and start over.  This time, a quick touch-up and 
ready for etching.

So, if you want to make a PCB milling machine, then go ahead.  If you want to 
make PCBs, then make PCBs.

Best wishes,

Andrew