I take no credit for the design - I am simply posting the information for others to share.
Note that the drill pivots slightly as it lowers, but this should not be a problem for thin material (such as PCB's).
And a big thank you to Ken for the original idea
Step 1: Gather Materials
- back support
- two arms
- front piece
- four hinges
The wood I chose was from an Ikea shelf system, approx 18mm (3/4") thick, and 90mm (3 1/2") wide. I had several candidates for the wood, but chose this because it was slightly wider than the hinges, and also sturdy.
I guessed the sizes, making the base longer than the arms. Approximate sizes are:
base - 450mm (18")
back - 270mm (10 1/2")
arms - 310mm (12")
front - 90mm (3 1/2")