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Old 03-29-2006, 12:15 PM
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Hood is Warped from Sandblasting

I have a 55 ford trk. hood that is warped from sand blasting, off to the left of the center of the hood. Problay about a good 16 in. area, you know it pops in and out.
What would be the best way to tackle this? Being I would like it to look good from under the hood also. Thank You for your time
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Old 03-29-2006, 12:45 PM
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A shrinking disc sounds like the tool you'll need to tackle this area, it should tighten up the dished area and pull it flat again.
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Old 03-29-2006, 12:51 PM
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in my auto class we usually just heat it up with torches and then poor water on it to make in contract but never done an area quite that big before.
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Old 03-29-2006, 01:13 PM
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Quote:
Originally Posted by blackjackbender
in my auto class we usually just heat it up with torches and then poor water on it to make in contract but never done an area quite that big before.
At the risk of sounding like a smart *****,that is not shrinking,and the metal will return to the same state that it was before it was heated after it cools down.The shrinking disc and a shrinking dolly sounds like the way to go.JMO,and Im sure some one will prove me wrong.
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Old 03-29-2006, 01:51 PM
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Quote:
Originally Posted by blackjackbender
in my auto class we usually just heat it up with torches and then poor water on it to make in contract but never done an area quite that big before.
yeah, torch shrinking will work but working on a hood is a touchy area. There's many ways to do it. A stud gun can be used. Drilling 1/8" holes and mig welding them shut plus cooling with water works. For severely stretched areas I've even cut slits in an x shape with a body saw and welded them back up.

A shrinking disc would make for less chance of damage.
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Old 03-29-2006, 03:21 PM
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Quote:
At the risk of sounding like a smart *****,that is not shrinking,and the metal will return to the same state that it was before it was heated after it cools down.The shrinking disc and a shrinking dolly sounds like the way to go.JMO,and Im sure some one will prove me wrong.
How is that not shrinking? Thats the way I was originally taught to shrink in school, heat a small area cherry red and cool right away with a wet rag, but there is usually a quick hammering on dolly before quenching with the rag, really could use more then two hands when doing all this. I use the attachment on my stud welder now to do the job, since I haven't got a set of torches for home yet. Hoods are usually a pita to straighten a decent size area, because the normally are realitively flat with very little crown to them.
Wouldn't sandblasting tend to shrink the metal rather then stretch it though? (but oil canning would be an indication of being stretched)Maybe I am off base, but would think the sand with pressure would be like taking a bunch of microscopic pick hammers and beating on the metal.
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Old 03-29-2006, 03:31 PM
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You are exactly right, the particles of sand are like a microscopic pick hammers dinging the metal. Those dings are pushing metal around, stretching it.

Personally, unless you are a master, this hood is likely toast.

Brian
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Old 03-29-2006, 03:32 PM
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heat & quench...as done by a professional. When i saw the process being done on my hood, i nearly shat
when it was all said & done....hood is smooth.....careful application of bondo
as for the underside, i sprayed a coat of Gator Guard....looks good & hides all the burn marks.
just my .02
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Old 03-29-2006, 03:32 PM
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Quote:
Originally Posted by baddbob
A shrinking disc sounds like the tool you'll need to tackle this area, it should tighten up the dished area and pull it flat again.
how does a shrinking disc work, what do they look like?
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Old 03-29-2006, 03:50 PM
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55, If the complete hood was sandblasted are you sure that spot is the only one? I am no expert on repairing sandblasted metal but after blasting on a Mustang deck lid and door I became a MASTER at warping them I too thought at first I could repair the damage but after chasing high and low spots all over the place I finally decided the entire deck lid was warped and tossed it for a new one, not saying yours can't be repaired but look closely. Sandblasting body panels
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Old 03-29-2006, 03:51 PM
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A shrinking disk is a..least mine is..a smooth disk of stainless steel which goes on your drophead grinder in place of the grinding wheel..it is applies to the metal and heats thru the friction of the spinning disk..when the metal is hot then one applies the wet rag to the metal which shrinks it..the secret to the shrinking disk is that the disk is much more controllable than the torch or other methods of shrinking..and one is not as likely to destroy the workpiece..

Sam
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Old 03-29-2006, 04:10 PM
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thanks , i understand now
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Old 03-29-2006, 05:39 PM
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You can find a lot of shrinking disc information by doing a google search.

John
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Old 03-30-2006, 03:10 AM
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Thanks for all the input, I'm going to try to start on this mess tonight after work.
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Old 03-30-2006, 07:27 AM
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Quote:
Originally Posted by MARTINSR
You are exactly right, the particles of sand are like a microscopic pick hammers dinging the metal. Those dings are pushing metal around, stretching it.

Personally, unless you are a master, this hood is likely toast.

Brian
I made the same mistake about 30 years ago with a hood for a 56 Ford. IMHO, save yourself a lot of grief and expense by getting another hood.
ZAPPER
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