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shrinking metal how to.

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jnewark

04-06-2005 06:28:20




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greetings.. I need a little info on shrinking metal, I had an over zelous student with a planishing hammer, now I have a super c hood with a bubble in it. How do I use a torch to shrink the bubble back out.. seems like this is becomming a lost art. thanks in advance
jack




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osterhaus

04-08-2005 21:53:00




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 Re: shrinking metal how to. in reply to jnewark, 04-06-2005 06:28:20  
If you have a planishing hammer, a hand body hammer, dollie and a small torch, you have everything you need to get that dent out. I personally do not do the heat and cool quickly deal, not enough control. The way I would do this is "trap" the excess metal with the hammer and dollie. To do this warm the metal slightly and work from the outer edges in, going all the way around. What you are trying to do is get all the excess metal into the smallest area possible. You may have to heat and work, heat and work. Do not over heat, orange is to hot. When you get it into a small area, heat only the dent and wack it down on top of its self. Use the dollie to back up the hood and quickly drive the dent down on top of its self. Do not over work the dent or you will stretch the metal again. Do this with the metal warm to hot. At this point you should be be able to go back to the planishing hammer and work out the wrinkles. Good luck, This will work just take your time.

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EX-pro

04-06-2005 10:11:05




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 Re: shrinking metal how to. in reply to jnewark, 04-06-2005 06:28:20  
You can get alot out with a shrinking hammer and a dolly. Most of the new spot weld stud pullers come with a shrinking tip also. They are easier to control than a torch.



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dr.sportster

04-06-2005 08:17:34




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 Re: shrinking metal how to. in reply to jnewark, 04-06-2005 06:28:20  
Ive had this on a Harley rear fender right by a hinge.After reading up,lighting torch trying to shrink it with heat and a wet rag,I ended up going to a pro who probably wished I had never touched it.Although he didnt complain he fixed it perfectly.You need a body shop with skilled old guys.The younger bodymen are no longer are adept at these skills.If you try it I would practice on a scrap metal piece first.Good Luck.

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rustyj14

04-06-2005 18:17:08




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 Re: shrinking metal how to. in reply to dr.sportster, 04-06-2005 08:17:34  
The advice given in the previous letter is good! If you try to shrink it yourself, you'll probably screw it up! But--With a finishing body hammer, and a round nose hand dolly, a welding torch, and some patience, it can be done. first, go over to the local auto body shop and get a junk hood or fender, take it home, and practice on it first! Put a similar dent in the used part! Grind off any paint or primer. Grind lightly, don't warp the metal! Then heat a spot about 3 inches in diameter, using the dolly nose, bump up on the dent, and hammer off the dolly as you bump the hot metal up, or down. now, if the dent or bump is in the middle of a large flat area, better to get professional help! by: Rustyj
Note: It will be handy to have something to hang the lit torch on, so you don't have to keep lighting it up each time, or turning it off to do the work! This holds true, unless you have 3 hands!

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