Re: Machine Shop

On 3/4/2025 12:44 AM, AMuzi wrote:

 For a typical dent, this Waterford for example:
http://www.yellowjersey.org/wfd12a.jpg
 the tube is rolled to reform the greater part of the deformation:
 http://www.yellowjersey.org/wfd12b.jpg
 then the remaining low spots are filled with polyester bondo or with metal (brass, silver, lead. I use lead):
 http://www.yellowjersey.org/wfd12c.jpg
 and finished:
 http://www.yellowjersey.org/wfd12e.jpg

Could you explain what's meant by "the tube is rolled"? As I said earlier, I'd thought the first step would be pushing a mandrel through (if the dent was in the seatpost) to partially push out the dent. Of course, that wouldn't work except on a seat tube, and I suppose would still require filling. Are you skipping that step entirely?
BTW, my antique BMW has a slight dent in the top of the gas tank, apparently from something falling onto it. I've heard of "paintless dent repair" for car bodies and wondered about it, but never looked deeply into it. I gather that some skilled body workers can do pretty well at pushing dents back out from the underside.
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- Frank Krygowski