MadModder
The Shop => Metal Stuff => Topic started by: RussellT on August 10, 2015, 04:34:28 PM
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This is my first attempt at metal spinning (not counting the one 10 minutes before this where I overdid the annealing and the metal went too soft :doh:).
I have a car radiator which is leaking from the join with the filler neck - I've soldered it once and a professional has done it once and it's leaking again. This time the rest of the radiator is a bit tired so I plan to get it recored. I want to try and stop this leak properly and I think a flange that bridges the joint might give it sufficient extra strength. Here's a picture of the filler neck. In spite of the bracing piece it cracks the solder underneath the neck.
(http://www.hockerley.50webs.com/spinning/radiator.jpg)
I could turn a flange from a bit of bar but I haven't got any and it would be expensive. I have got some brass sheet though so I thought I'd try metal spinning.
Here is the setup to try it. The former is from the scrap box (a collet chuck which I took too much off). The brass sheet has been fitted to it with a hammer and a jubilee clip. I drilled it in the lathe.
(http://www.hockerley.50webs.com/spinning/drill2.jpg)
This is the lever arrangement. The toolholder isn't clamped to the toolpost and the toolpost has been oiled. The bar has a rounded end from a test of a ball turner. The bar is just resting on the toolholder slot.
(http://www.hockerley.50webs.com/spinning/lever.jpg)
This is the result. It took much less force than I expected. I annealed it twice.
(http://www.hockerley.50webs.com/spinning/spun.jpg)
And here it is parted off and cleaned up.
(http://www.hockerley.50webs.com/spinning/cleaned.jpg)
I'm encouraged by this experiment - it didn't feel like I was abusing the lathe much - and the result was OK.
The next step is to make a former the correct size.
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I've done a little bit of spinning. One tip I was given was to use a small ball bearing mounted on the toolpost as the pressure point.
Here's a couple of pics, material is 316 stainless...
(http://i87.photobucket.com/albums/k142/madluther/Turbine%202/th_t2_cc2.jpg) (http://s87.photobucket.com/user/madluther/media/Turbine%202/t2_cc2.jpg.html)
(http://i87.photobucket.com/albums/k142/madluther/Turbine%202/th_t2_cc3.jpg) (http://s87.photobucket.com/user/madluther/media/Turbine%202/t2_cc3.jpg.html)
(http://i87.photobucket.com/albums/k142/madluther/Turbine%202/th_t2_cc6.jpg) (http://s87.photobucket.com/user/madluther/media/Turbine%202/t2_cc6.jpg.html)
Regards,
Steve.
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Nice job...
look forward to the repair with interest.
Anthony.
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yo..
i looked through your complete library of the turbine you built.. you ought to think about publishing the build on here looks rather interesting.
Anthony.
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Thanks Anthony,
I did a build thread on HMEM a year or so ago, I assumed that most of the modding / machining community had seen it as I see participation by the same folks on all these sites.
Here's a link http://www.homemodelenginemachinist.com/showthread.php?t=17433
Apologies to Russel for the hijack :)
Regards,
Steve.
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No problem Steve. Thanks for the tip. Your setup makes mine look very crude.
Thanks Anthony.
I thought about using a bearing as Steve suggested but my test piece seemed OK so I tried the same way again. I made a former out of a bar and had another go. I annealed it twice and this time I made an effort to clean up the surface that will be soldered while the part was still in the lathe.
Here's the result.
(http://www.hockerley.50webs.com/spinning/side1.jpg)
(http://www.hockerley.50webs.com/spinning/side2.jpg)
There's a slight flat on one side but that's Ok as one side will need to be fitted against a seam. I left the clearance around the neck generous as that will hold a fillet of solder. I think this will work.
Russell