I made a small (6" x 8" x 12-14" tall) inverted drill press with a bolt together frame out of 8020 aluminum extrusions. The table is a 1/8" x 6" x 6" piece of "flat bar" steel. I used steel so it could be held to the frame with magnets to allow quick removal for easier access to change the drill bit. Two magnets on top of the PCB adequately hold it in place for drilling. The drill motor is an inexpensive 12V hobby motor. The drill is moved via a lever rotating?a cam (the "cam" is a 1.5" fender washer from the hardware store). It drills to an accuracy of about 0.001".
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I use a machinist's centering scope to view and center the PCB however, I think a video camera setup would be less awkward to use and I would be interested in a link or other information about one that would not require a computer to drive it and the display.
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Pictures of the drill are in the photos section in an album labeled Craig L's Photos. Some further details are in messages #34018, #34039 and #34088 of a rather long discussion that sometimes got sidetracked into an argument about the safety of autotransformers;
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Craig L
On Sat, Mar 9, 2019 at 02:06 PM, Harvey White wrote:
On Sat, 09 Mar 2019 14:39:37 -0500, you wrote:
I borrowed Harvey's idea for an upside down drill press and made this:
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Nice job. Your's is more buildable by the average hobbiest, because
not only did you explain the steps, but you didn't really throw
technology at it.
I did, and could. Granted, it was technology I *had*, but it can be a
bit more.... hmmm.... complex than most want to do.
thanks for the credit, too. My idea came from a completely mechanical
setup I saw a picture of, once. Lots of lenses, mirrors, ground glass
screen, and so on. I hesitate to even imagine the price.
Harvey
