This is a little something I made the other night. I needed to transfer a bunch of countersunk holes for a day job project. I didn't have time at work, and just made it at home. It will probably come in handy for some of my shop stuff, so I had no problem doing it on my own time.
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| Excuse the long thumb screw, I just didn't feel like trimming it. |
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| The inner piece is .375" OD, with a .187" ID. The ID fits a .187" transfer punch. The outer piece is reamed to a nice sliding fit with the inner piece. The thumb screw, obviously, locks them together. |
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| I can place it against the hole and press the inner piece in to mate with the existing counter sink. then I can lock the outer piece. The face of the outer piece is there to make sure that the punch is held square. |
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| Bam! A perfectly placed punch mark! |
This version will do #8, and #10 holes. It might be able to do smaller holes, I haven't checked. The idea is that a couple of these punches would cover a wide range of holes by sliding the inner piece up or down within the outer part in order to seat in the counter sink.
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