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Post subject:Using a brake to flatten a hem
 Posted: Oct 04, 2008 - 04:04 AM #7876
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Joined: Aug 21, 2007
Posts: 4
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The only decent way I have found to flatten a long hem on 22ga stainless is to use my Chicago 818 brake. I would assume this is not recomended by brake manufacturers but I have done it for years and it works marginally OK for the purpose.
The question is if a heavier brake like an 814 would be able to apply more force to make the hem flatter or would a Roper Whitney style combination brake where the top leaf is stationary and the bending leaf moves up work better for this purpose?
I have never used a Roper Whitney but the tightening action looks like it has better leverage than a Chicago Style. Thanks |
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Post subject:RE: Using a brake to flatten a hem
Posted: Oct 06, 2008 - 08:14 PM #7892
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Contributing Tinner
Joined: Nov 27, 2006
Posts: 31
Location: Omaha, NE
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I would be leary of using an old Chicago hand brake to hem stainless steel. The clamp handles are cast iron and break easy. To replace one is around $500.00 or you have to have it brazed.
Yes, a heavy rated brake will be able to apply more force since it is built stronger with larger parts (ie. handles, apron, upper apron, etc..)
The best way that i know to flatten the hem is to bend it in the brake as far as you can, then remove the metal, clamp down the upper apron and set the metal against the nosebar and raise the lower apron as far as it will go. |
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Post subject:RE: Using a brake to flatten a hem
Posted: Oct 09, 2008 - 02:12 AM #7910
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Serious Tinner
Joined: Nov 13, 2007
Posts: 141
Location: Omaha, NE
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| In the automated brakes you can offset the flattening step. Instead of smashing the hem at the bend it backs off and puts the pressure on the flap. This is much easier on the machine. See the illustration: |
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Post subject:RE: Using a brake to flatten a hem
Posted: Oct 09, 2008 - 11:10 PM #7914
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Joined: Aug 21, 2007
Posts: 4
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Thats actually how I do it now with my apron brake. I usually make a .500 inch hem and in 22 gauge it flattens OK . A little radius is what I prefer as it gives more strength to the edge than a completely crushed hem.
The main thing I want is for the hem to be flattened as evenly as possible mainly just for appearance. I would imagine a press brake would do a great job but I don't see one in my near future. A heavier brake may be justified and I was just wondering if any one style of brake would be better for doing this with. |
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