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Old 01-17-2005, 09:31 AM
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Stretched metal.

I have a fender from a 52 buick super that I sent out to be glass beaded but the butthead used sand and warped it. The metal bulges out slightly but I'm afraid to hammer it in case I stretch it out more . Can metal be shrunk and if so how and can a novice do it? I have done other body work before but I don't want to bang it in and fill it will bondo. Any advise will be greatly appreciated. thax.

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Old 01-17-2005, 11:45 AM
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Yes, more hammering will stretch the metal more. The best method to shrink metal is with a torch and body hammer. Heat the center of the bulge with a red hot spot about 1/2" dia. which will expand that spot even higher. Take the body hammer and gently tap down the red spot in a circular motion from the outside in 'til it is at the level of the surrounding metal again. Quench the spot with a wet rag and check to see if it needs to be repeated elsewhere. Often takes two or three spots spread around a stretched bulge to get it back in shape. The combination of natural shrinkage of metal that has been heated and cooled and the hammering the hot metal to a smaller space quickly shrinks metal. Go slowly 'cause it is easy to over shrink. If you do, no bug deal, just use hammer-on-dolly method to stretch it back. Takes practice but is a pretty easy skill to become fairly proficient.
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Old 01-17-2005, 05:34 PM
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Another way to shrink the metal would be to use a shrinking disk. Randy Ferguson provides a tutorial at the beginning of the body exterior on removing dents that might provide a bit of an overview on using a shrinking disk.
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Old 01-17-2005, 07:40 PM
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I have had a shrinking disk for 20? years but have only used it a couple of times. I still trust the good old torch method the best!!
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Old 01-17-2005, 09:30 PM
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I certainly couldn't argue with success and experience! I've just seen Randy use the disk so often with great success wanted to offer it as an option as well.
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Old 01-18-2005, 12:59 AM
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Torch shrinking is extremely unpredictable in my opinion.

The shinking disc is the most controllable method for shrinking sheet metal.

I've absolutely ruined panels with the old torch shrinking method, so for me, it's a distant memory, THANK GOODNESS!!!!

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Old 01-18-2005, 05:54 AM
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Hi Willys36,

You must have one of the old sunchaser discs. They work great..just not as good as a the flat ones with a safety edge (my biased opinion). You should try using it again. You will find it to be a very nice tool. I will never go back to torch shrinking. Since you purchased yours, Ken at sunchaser has made a video as part of his kit...he might sell it separately to a past customer. I plan on making short video to go with mine soon. They are really easy to use though. The key is to look for steam when quenching to know you are getting a shrink.

Darkside,

The disc alone will probably not be enough, unless all you have is a smooth swell in the panel. You will probably have to bump the metal or smooth it with hammer and dolly, or both....the disc will take away the fear of hammer and dolly work since you now have a way to correct mistakes. You can do a lot of hammer and dolly smoothing using medium blows, then a shrinking disc for tune up. Very simple once you've done it a little.

John
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Old 01-18-2005, 07:32 AM
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Thanx for the encouragement. I'll drag out the old disk next project and try it again.
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Old 01-18-2005, 10:06 AM
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stretched metal

O.K. I'll give it a try. Where do I get one and how does it work?Is this disc something you hit with a hammer or put on your air chissel or grinder or what.
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Old 01-18-2005, 11:12 AM
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My understanding is that we are not to post links here? I make shrinking discs. You can contact me directly at: ghiafab@msn.com

The disc goes on a grinder or sander much like a sanding or grinding disc. I have several albums I can point you towards.

John
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Old 01-19-2005, 07:33 AM
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swell

The swell I have is about 2" wide and about 10" long .It s about 1/4" high. It's about 3" below and slightly back of the portholes on the fender. I watched the video and the disc looks like the tool to use.I will be contacting you to find out more.thax guys. As always your all a great help to the less skilled.
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Old 01-19-2005, 08:17 AM
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Quote:
Originally posted by John Kelly
My understanding is that we are not to post links here? I make shrinking discs. You can contact me directly at: ghiafab@msn.com

The disc goes on a grinder or sander much like a sanding or grinding disc. I have several albums I can point you towards.

John
It isn't that you can't post a link here, it is that you can't be "pushing" a product here. If you are "selling" too much, you will be told to stop or locked out. It is a shame being your product is so relevant, but you understand how easy it is for this stuff to get out of hand.
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Old 01-19-2005, 09:03 AM
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I think your offer to 'help' is justified since it is a great solution to the guy's problem. Our dandruff would be up if you came on here with a sales banner for the disk, @ [color=orange]"$19.95, and only $35 shipping and handling if you call within the next 30 seconds"[/color] with a [color=orange]"But WAIT!"[/color] sweetener, type thread.
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Old 01-22-2005, 08:26 AM
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Thanks guys.

John www.ghiaspecialties.com
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