robcas631
Well-Known Member
Has anyone attempted this on their lathe.......to make thin cylinder walls for a sterling engine? [ame]http://www.youtube.com/watch?v=77IN6UhGSZE[/ame]
Making a thin walled Cylinder
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Swifty
Well-Known Member
Rob, bear in mind that the video is a production machine using hydraulics to form the piece. A lot of pressure is required to form the parts. Did a lot of work years ago manufacturing the forms, or chucks as they call them, for some metal spinners.
When hand spinning, they used bars about 1mt long in order to get enough pressure, it was very interesting to watch. The material also thins out a lot, you can see that in the video when they spin the long cone, you would think that the blank material they used would be too small.
Tried spinning some end caps for a small boiler years ago, material was copper, used an old lathe at work. First tried a lever, then made a roller tool to mount in the toolpost. Very hard work, but eventually got there. Had to anneal the copper half way through. I would not try this on my lathe now for fear of damaging it with the pressure required.
Paul.
When hand spinning, they used bars about 1mt long in order to get enough pressure, it was very interesting to watch. The material also thins out a lot, you can see that in the video when they spin the long cone, you would think that the blank material they used would be too small.
Tried spinning some end caps for a small boiler years ago, material was copper, used an old lathe at work. First tried a lever, then made a roller tool to mount in the toolpost. Very hard work, but eventually got there. Had to anneal the copper half way through. I would not try this on my lathe now for fear of damaging it with the pressure required.
Paul.
Here's some good info on home metal spinning. http://aardvark.co.nz/pjet/spinning1.shtml
Make sure you check out his other projects. He's a kinda interesting bloke.
Make sure you check out his other projects. He's a kinda interesting bloke.
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Never seen it done but had to order spun lids for pressure vessels,up to 20mm thick now that must be some machine BAZMAK
robcas631
Well-Known Member
Ah now I see why it is not used in earnest on lathes. TY Paul
robcas631
Well-Known Member
Dinkum....he creates good work. TY for the link.
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Swifty
Well-Known Member
Metal spinning is a very old method, yet still relevant in this modern age. Makes the manufacture of some items very easy to produce, where by other means it would be impossible.
Manufactured some metal spinning "chucks" once, that we're in segments, to allow the removal of parts once spun. The parts were spun back on themselves making it impossible to get it off the chuck when finished. Once each piece was finished, the chuck was removed and pulled out piece by piece through a small opening left on the end of the part. The parts were for the top of lightning conductors being installed in Indonesia.
Paul.
Manufactured some metal spinning "chucks" once, that we're in segments, to allow the removal of parts once spun. The parts were spun back on themselves making it impossible to get it off the chuck when finished. Once each piece was finished, the chuck was removed and pulled out piece by piece through a small opening left on the end of the part. The parts were for the top of lightning conductors being installed in Indonesia.
Paul.
Yes I did, but did not succeed.
The aluminum got to hard to proceed. Instead of a cylinder I got a nice cone shaped thing. Annealing is the key I suppose.
During my first trial I worked with a fixed stud to do the pushing work. For the next trial I made myself a rotating tool, with a roller bearing inside. The fixed tool damaged the aluminum severely. I will continue in a few weeks when all other projects are finished.
Chris
