Homebrew PCBs

A very long time ago commercial hand drilling was done with the drill
mounted under a table and a microscope with cross hairs was used on the top.
The drill was on an air cylinder so when things were lined up a footswitch
was pushed.  No parallax. A similar rig was also used to create a NC paper
tape so additional boards could be drill automatically.

Bertho

 

From: schenckcharles  Sent: Thursday, June 09, 2011 13:30



Hello Group
I have a quick question about precision drilling of home made PCBs.
Because of poor eyesight, I use a CCD microscope next to my Dremel
Model 300 drill press stand. Although this set up is a big improvement
over doing thing solely 'by eye', there is a parallax error introduced
between the location of the retracted drill tip and where it eventually
comes in contact with the PCB. Once I saw a milling machine where one
was able to sight straight down into a bulls eye. Is there a way to 
rig mirrors to do this? 
P.S. Sincle sided boards are no problem, as I can hold them up to
strong light and position a hand held rotary tool with good enough 
accuracy. 
Any suggestions would be appreciated.
Cheers
Chris 



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