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- Feb 1, 2015
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This shows the process with a little more clarity.
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Punching Square Holes
- Thread starter PHPaul
- Start date
- Joined
- Nov 23, 2014
- Messages
- 2,637
I've got a Roper Whitney #218 punch press and do lots of square holes. You'd have to do some heavy modifying of a #5 Junior style punch to do square holes as neither the die or the punch are rotationally constrained. My #218 locks the punch and die from rotating so once aligned, they don't turn and scrub the sides.
Another square hole option is a nibbler. Couple of photos of ones I use are below. The top photo is of a popular one that runs around $12-$15. Think you need a slightly over 1/4" hole to fit the punch through, the nibble the corners. Lots quicker than filing. The lower photo is of an Adel nibbler which is a heavier duty punch.
Do a Google search for "sheet metal nibbler" and you see plenty of sources for the upper one. I bought my Adel off eBay (NOS) and replacement punches/return spring though I'm still on the original.
Bruce
Another square hole option is a nibbler. Couple of photos of ones I use are below. The top photo is of a popular one that runs around $12-$15. Think you need a slightly over 1/4" hole to fit the punch through, the nibble the corners. Lots quicker than filing. The lower photo is of an Adel nibbler which is a heavier duty punch.
Do a Google search for "sheet metal nibbler" and you see plenty of sources for the upper one. I bought my Adel off eBay (NOS) and replacement punches/return spring though I'm still on the original.
Bruce