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Tool Talk Discussion Forum

punching square holes for carriage bolt heads

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Wayne M Kittler

10-01-2003 06:32:06




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What is used for punching square holes for carriage bolt heads in sheet metal ?




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Wayne Woods

10-02-2003 09:31:22




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 Re: punching square holes for carriage bolt heads in reply to Wayne M Kittler, 10-01-2003 06:32:06  
If you have access to a plasma cutter, that's the real easy way. Make yourself a pattern to follow. You can then place the pattern over the place you want the hole, then plasma cut by letting the tip follow the pattern. Depending upon make and size of cutting nozzle, your pattern will be bigger than the finished hole. Sure is the easy way to get those square holes for carrage bolt heads, etc.

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john d

10-01-2003 20:24:04




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 Re: punching square holes for carriage bolt heads in reply to Wayne M Kittler, 10-01-2003 06:32:06  
The Greenlee punches are great. You can even put them in an arbor press for some applications.

Another option is to mark the outline of the corners, put it on a piece of solid steel for backing, and attack it with a small SHARP cold chisel and the hammer of your choice. Wear your safety glasses when doing this.



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buck

10-01-2003 17:20:24




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 Re: punching square holes for carriage bolt heads in reply to Wayne M Kittler, 10-01-2003 06:32:06  

If the edge of the hole can stand a little rounding I usually just clamp a piece of wood in the vice so I can drive against the end grain, lay the sheet metal over it and punch the hole. Any punch or piece of square or round stock will work.



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Art

10-01-2003 09:02:28




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 Re: punching square holes for carriage bolt heads in reply to Wayne M Kittler, 10-01-2003 06:32:06  
Try a Greenlee punch. You can get them at an electrical supply store, but the easist way is to drill a hole, and just use a small three corner file to square it up....Had a friend use a sabre saw w/ a small square file, but you have to rework the file tang so it will stay in the saw...Good luck



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George

10-01-2003 22:38:32




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 Re: Re: punching square holes for carriage bolt he in reply to Art, 10-01-2003 09:02:28  
Art,

Just a minor point -- you wrote, "... drill a hole, and just use a small three corner file to square it up ...". After having just made 24 each 5/16 square holes in 1/8 steel, a square file works a lot better than a triangular one.



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T_Bone

10-01-2003 09:33:41




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 Re: Re: punching square holes for carriage bolt he in reply to Art, 10-01-2003 09:02:28  
Hi Wayne,

Like Art said greenlee builds some fine punchs. You can also buy punch and die sets for using in a press brake. If you can find a machinest, they can also make them and alot do week-end work pretty reasonable.

You can also make your own.

T_Bone



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