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Silly Chassis Punch Question...
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Old 21st November 2006, 09:32 PM   #11
Casey4s is offline Casey4s  United States
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Originally posted by vax9000
HomeDepot has those Greenlee punches. It may not be listed on the webpages, but you can find them in your local store. Then you can take a close look of the size v.s. the label.

vax, 9000

The punches at Home Depot and Lowes are definately CONDUIT PUNCHES.
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Old 22nd November 2006, 01:03 AM   #12
mitwrong is offline mitwrong  China
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Default Punches


There is another punch manufacturer called " Engineer and Tazan ". These two Co. are from Japan, Special make for tube sockets. most type of socket can fit!

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Old 22nd November 2006, 01:29 AM   #13
Sherman is offline Sherman  United States
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Originally posted by 375
I...A hole saw will be the exact size, but can discolor the surrounding area if not careful.
I have been using a 7/8" step drill for nine pin sockets and a 1 1/8" hole saw for octals. The trick is not to use too high a drill speed. A little cutting oil doesn't hurt either.

I found that the blu-mol bimetal hole saws work great and stay sharp. I have them in sizes from 1 1/8" to 2 1/2" and have used them on everything from Hammond steel and aluminum chassis boxes, to 1/8" thick aluminum plate.
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Old 22nd November 2006, 02:40 PM   #14
cbutterworth is offline cbutterworth  United States
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Great timing on this thread, as I am just about to put holes in my new chassis. I bought 20 gauge steel (17 x 12 inches). I have octal tubes and sockets that are around an inch diameter.

Someone told me that on such "thin" steel, hole punches can bend the metal. Is this likely to be true? Of course, I can easily invest in a hole saw of around this diameter, and drill slowly with a little oil.

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Old 22nd November 2006, 04:57 PM   #15
smoking-amp is offline smoking-amp  United States
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I have been punching holes up to 1-3/32 inch with the cheap Harbor-Freight conduit punches in thin steel bake pans without any bending problems.

Looking at the punch set, the clearance between the punch and die looks close up to the 1-3/8 hole size, but the 1.7 inch hole size has a noticeably larger clearance and would no doubt cause bending problems with thin material.

Looking at the Greenlee punches, I see close clearance up to 1- 3/8 inch size too. Don't have the bigger Greenlees here to check.

Probably will depend on the brand of punches and size of hole, with bigger holes more likely to cause bending problems. Older, used punches with dull punch edges, will be more likely to have bending problems too.

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Old 22nd November 2006, 07:01 PM   #16
zobsky is offline zobsky  India
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Default here's what i use

http://www.oselectronics.com/ose_p64.htm - i thought i paid a little less a few years ago, but still cheaper than a set of greenlees. These punches match up with most sockets (octal, 7 pin, 9 pin, 5 pin etc) that i've needed to use, as an occasional weekend warrior..

I'm considering a set of step drills sometime in the future, now that they're somewhat cheaper than a few years ago.
"Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein
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