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Old 02-07-2011, 07:48 AM
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Default Tipping an edge on a curve

What is the best way to fold an edge over when the metal makes a sharp curve? For example, I am making a piece out of 18 ga sheet metal, and wanted a 1/4" lip on the edge to stand 90 degrees to the plane of the metal. I also wanted a finished edge to this lip, so thought I'd fold a 1/4" edge over. However, I also had to make a 90 degree bend. So I'm folding over an edge on sheet metal that makes a 90 degree bend.

I tipped the edge and folded it over, and that required a little shrinking to get the edge to make the 90, but worked fine. However, when I tried to stand the folded edge up, it required a lot of shrinking in the corners. This makes sense, since there was double the metal. However, I think my technique is lacking, as I'm getting splits between the two layers in the curve.

I've been doing most of this with a hammer and either a metal dolly or a piece of wood I cut to match the inside curv. Does the split mean I used too much force? Would heat help?

Thanks for any suggestions,
Ian
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Old 02-07-2011, 08:01 AM
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Ian, on tighter corners like this, I often grab the torch to warm things up some to make it easier to crush the tucks that form when you make the corner. Not so much that the flat panel warps, but enough to make life a touch easier. I also crush these tucks on a metal dolly or stake, I have a few that I use just for this purpose.

I didnt see any split or cracks in your photo? To me, it looks like you just need to continue tucking and shrinking to finish.

Marty
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Old 02-07-2011, 08:05 AM
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Hi Marty,

Thanks for the heat suggestion, I'll break out the torch and see if that helps. The split is on the lower corner, between the folded inner edge and the outer.
Ian
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Old 02-07-2011, 08:40 AM
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A large piece of round stock placed in the corner would make a good "anvil" for you...


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