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Post subject:Die Punching...??
 Posted: Apr 09, 2007 - 07:22 PM #6189
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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Hi. Bear with me, this is my first post here!
What would be the least expensive way to punch a clean hole 1.5"dia - 2"dia in 20ga Stainless Steel? Thanks a lot for any help!  |
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Post subject:RE: Die Punching...??
Posted: Apr 10, 2007 - 10:58 AM #6200
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Power User
Joined: Feb 19, 2006
Posts: 132
Location: Texas
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Post subject:RE: Die Punching...??
Posted: Apr 10, 2007 - 12:20 PM #6201
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Webmaster
Joined: May 13, 2003
Posts: 1316
Location: Waukesha
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| I might have this unit at the shop? I'll look and if so I do have some stainless to try it on:) |
_________________
"If you make your job important it is quite likely to return the favor" Author Unknown
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Post subject:RE: Die Punching...??
Posted: Apr 10, 2007 - 11:48 PM #6204
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Power User
Joined: Apr 04, 2007
Posts: 93
Location: Florida
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Its not cheap but depending on the amount of holes I might try something like an Edwards Ironworker. Ours does a clean .375" hole in .125" stainless steel bar stock. Its a 55 ton unit. I have to work with some 18 Ga. SS here shortly so we will see how it behaves. The best test I can do now is 22 ga. I will try that tomorrow.
Geesh! I hate Stainless steel! |
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Post subject:RE: Die Punching...??
Posted: Apr 12, 2007 - 09:01 PM #6215
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| Has anyone tried what they were talking about yet? Thanks! |
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Post subject:RE: Die Punching...??
Posted: Apr 12, 2007 - 09:04 PM #6216
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| For that knock out punch is it used with a hydraulic punch or what? Thanks |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 02:27 AM #6218
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Power User
Joined: Feb 19, 2006
Posts: 132
Location: Texas
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| For the knock out in the link that I gave, you drill a hole the size of the bolt in the center, insert the bolt with the cup attached through the hole then thread the punch onto the bolt on the other side and tighten untill it cuts through. We have a hydraulic one with a hand pump in our tool room. |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 04:19 AM #6219
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| Do you think that it would punch through 20ga stainless? Is there something like that you could use with a press? Thanks for your help |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 04:36 AM #6220
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| I'm looking at a GREENLEE HYDRAULIC HAND PUMP #767 on Ebay. Could someone explain how it works? Thanks for your help |
Last edited by toofazt on Apr 13, 2007 - 04:47 AM; edited 1 time in total
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 04:45 AM #6221
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| And is there something like this that isn't portable? Seems like it would add to the price because of the portability...? |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 11:02 AM #6222
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Power User
Joined: Sep 03, 2003
Posts: 172
Location: edinburgh
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| You could use a fly press and two short pieces of pipe to protect the bolt, you should be able to punch the 20 swg using these punches using the vice and an allen key i regularly cut holes in 16 swg up to 2"dia by hand . aw ra best Marky |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 07:24 PM #6224
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| Looks like I'm going to get either a Roper Whitney No. 118 or a Greenlee Slugbuster Knockout #767. What one would be better for punching 1.5" & 2" holes in 20ga stainless? Looks like they both cost about the same... I think the dies for Greenlee are conduit size. Is there a chart that shows what size hole they will actually punch? THANKS! -Steve |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 10:48 PM #6225
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Power User
Joined: May 16, 2005
Posts: 176
Location: Atlantic, Iowa
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| The roper 118 or 218 (which I have) will do a very nice job. The punch of that size will be a split cut punch....this will make the cut much easier. I have not punched 20 ga. stainless but have done several 24 ga. I have also punched 2" holes in 16 ga. cold roll with ease....so I think it will do the stainless 20 ga. I would give Roper a call and ask. You can find the 118 & 218 on Ebay quite often....but I would buy the punches new from Roper. Current price is 83.00 for the 2" punch & die. Hope this helps. |
_________________
Stickman,
The thin tinman.
www.martinsheetmetal.com
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 11:01 PM #6226
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| So would you recommend the Roper 118 over the Hydraulic Greenlee Knockout? Thanks |
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Post subject:RE: Die Punching...??
Posted: Apr 13, 2007 - 11:34 PM #6227
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Power User
Joined: May 16, 2005
Posts: 176
Location: Atlantic, Iowa
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Post subject:RE: Die Punching...??
Posted: Apr 14, 2007 - 05:22 AM #6231
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Joined: Apr 09, 2007
Posts: 39
Location: Upland, CA
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| Anyone here use a Greenlee punch? |
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Post subject:RE: Die Punching...??
Posted: Apr 14, 2007 - 06:31 AM #6234
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Power User
Joined: Apr 04, 2007
Posts: 93
Location: Florida
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| Sorry my hard drive died. I did punch a 1.0625" in 22 Ga. SS. It was very clean. The backside might, depending on your usage, need to be smoothed out I had a slight bur.. My machine only goes to that dia. and I can't break into my 18 Ga just yet for a better test, sorry. |
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