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Author Topic: Drilling holes in sheet metal  (Read 14213 times)
KB1WSY
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« Reply #45 on: July 18, 2012, 01:10:45 PM »

Radio Daze has this set, or individual punches for $19.   I have seen no-name sets on Ebay, but didn't find one in a quick search.

Thanks, but what I'm looking for is much more specific. (I already have a selection of Greenlee punches for the basic round holes.)

--The chassis punch for Octal/Magnal (8- or 11-pin) is actually keyed (there is a little protruding "lip" in the edge of the hole) to prevent the male connector from rotating. I am told that this punch exists, but have had no luck finding it, so far. The alternative is to use a keyed metal flange and a "springy washer" to hold the plug to the chassis, and this works fine.

--The IEC punch is a different story altogether. This is an irregular shape: a six-sided hole with rounded corners and shouldered top edges. I am told by people who have made this hole using drills, nibblers and files that it is quite difficult to do -- one person told me it was a good occasion for inventing new four-letter words. Supposedly there is a Greenlee-type punch for it, but no one seems to know where to find it, plus it costs something like $200, maybe. Greenlee, on its website, does not explicitly offer such a punch although it does have a whole selection of rectangular punches. (IEC is the name given to the almost universal A/C socket that is found on the back of most electronic equipment nowadays.)

73 de Martin, KB1WSY
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G3RZP
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« Reply #46 on: July 19, 2012, 02:10:27 AM »

My suspicion is that such punches would be made for use on a flypress, possibly as a special in the toolroom. I can see how to make one with a lathe and a mill and doing some welding.....and probably a day's work. You would need to weld rather than braze because of the heat needed for hardening and tempering.

Unless you need to punch a lot of holes, hardly worth it.
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