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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tin Ware Restoration
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<blockquote data-quote="ClassicBiker" data-source="post: 113726" data-attributes="member: 1632"><p>My father was a sheet metal model maker. One trick he taught for repairing dents where the metal had been stretched, particularly good when the item had a lot of shape to it or strength like a mud guard, was to heat the affected area with an acetylene torch red hot and drive the metal from back side while support the front side with a dolly. This will shrink the metal and create a flat spot that has plenty of metal to shape back the original direction without the risk of splitting it because it has become to thin.</p><p>Doing this on flat panels will work as well, but if you don't get all the metal driven back it may 'oil can' which is that it pops back and forth not knowing which way to be. So you have to reheat and do it some more.</p><p>Depending on the size of the dimple, access to it, and the amount of stretch already present a set of welding clamps like this</p><p>[ATTACH=full]30701[/ATTACH] with the feet removed and a stack of washers brazed to one side and a suitably sized ball bearing on the other side will allow you to raise the dimple little by little. Then you dress back the raised metal with a file. This method will definitely thin the material though. The benefit is it is quicker and quieter than using pick hammer.</p><p>[ATTACH=full]30702[/ATTACH]</p><p>Steven</p></blockquote><p></p>
[QUOTE="ClassicBiker, post: 113726, member: 1632"] My father was a sheet metal model maker. One trick he taught for repairing dents where the metal had been stretched, particularly good when the item had a lot of shape to it or strength like a mud guard, was to heat the affected area with an acetylene torch red hot and drive the metal from back side while support the front side with a dolly. This will shrink the metal and create a flat spot that has plenty of metal to shape back the original direction without the risk of splitting it because it has become to thin. Doing this on flat panels will work as well, but if you don't get all the metal driven back it may 'oil can' which is that it pops back and forth not knowing which way to be. So you have to reheat and do it some more. Depending on the size of the dimple, access to it, and the amount of stretch already present a set of welding clamps like this [ATTACH type="full"]30701[/ATTACH] with the feet removed and a stack of washers brazed to one side and a suitably sized ball bearing on the other side will allow you to raise the dimple little by little. Then you dress back the raised metal with a file. This method will definitely thin the material though. The benefit is it is quicker and quieter than using pick hammer. [ATTACH type="full"]30702[/ATTACH] Steven [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Tin Ware Restoration
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