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How hot to heat when shrinking metal?

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Bob K

11-02-2001 05:49:52




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I started working on some warps on my JD 50 hood last night and was wondering about the heating-and-cooling method to shrink the metal per what I read on this forum. How hot is "hot" when heating metal? I brought a small spot up to cherry red and tapped the warp into submission with my hammer. On the larger warp (about 30" long along the bottom right side of the hood), how hot do I need to heat that area before applying the wet rag to shrink it? I did my first sheet metal work about 10 hours ago and am still wet behind the ears. Thanks for any two-bits of info.

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canadianbodyman

12-27-2001 10:04:13




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 Re: How hot to heat when shrinking metal? in reply to Bob K, 11-02-2001 05:49:52  
Bob,
You've got the right idea with the cherry red. What you want to do is have a dolly behind the area to shrink, hit the hot spot and then work from the outside to the middle with light taps.
When cooling just touch the rag to the metal first then remove, the amount of time that you hold the rag on the metal will control the amount of shrinkage, too much and it will get "oil-canny" on you. Good Luck.

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canadianbodyman

12-27-2001 10:03:51




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 Re: How hot to heat when shrinking metal? in reply to Bob K, 11-02-2001 05:49:52  
Bob,
You've got the right idea with the cherry red. What you want to do is have a dolly behind the area to shrink, hit the hot spot and then work from the outside to the middle with light taps.
When cooling just touch the rag to the metal first then remove, the amount of time that you hold the rag on the metal will control the amount of shrinkage, too much and it will get "oil-canny" on you. Good Luck.

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