#41
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So I finished the steel forming plates. Radius is about the same as on the wood plate, and it seems to work very well. I sanded the radius with 240 grit and it's very smooth.
A few things needed before I'm finish. I need a backing plate with an oversize hole for the half sphere to protrude into, the mark on the part is from inaccurate placement on the plates on the hydraulic press. It would also be nice to have a thick plate on top of the upper plate, with a hole that will fit the punch and keep it vertical and centered before pressing. And a stop mark is also needed, I over-pressed by about 10mm. The blank was 90mm. I think I can go smaller, I'll check it out when the other stuff is done. Boring the holes to size in the steel plates: DSCF4228.jpg Lower plate radius: DSCF4237.jpg 90mm blank and 0.5mm spacers: DSCF4229.jpg Plates assembled with blank in place: DSCF4230.jpg On the press. See how I could use a guide for the punch and the black plates on the press has a V-cut in them, giving a hole, but the sphere hit on edge during forming: DSCF4231.jpg Sphere protruding from bottom plate after pressing: DSCF4232.jpg Got the correct shape from the punch: DSCF4234.jpg See the mark on the left - it made the part sit tightly on the punch: DSCF4235.jpg Finished part with a bit of over-pressing but it looks mighty fine to me: DSCF4236.jpg
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Martin |
#42
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very awesome
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#43
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mission accomplished
Very well done. I love the evolution.
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Bill Funk |
#44
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Fantastic work there, Martin! Thanks for posting the pictures
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#45
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Thanks, and thank you all for your help. I'm on my way to bed now, and it's work day tomorrow, so I can finish this tomorrow evening, and start making some spheres and I'll post some pictures for you of that also
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Martin |
#46
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Thanks for documenting your process! It's very helpful.
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Ezekiel |
#47
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Quote:
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Lee. If it itches,......you just got to scratch it! |
#48
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It's done!
Lower protrusion plate to the left, punch guide from hard wood mounted on the upper steel plate to the right: DSCF4238.jpg Punch guide mounting screws: DSCF4246.jpg Setup in the hydraulic press: DSCF4241.jpg 70mm steel blank turned into a half sphere: DSCF4247.jpg Video of the press gauge while making the above half sphere (it's a cheap press but it works):
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Martin |
#49
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Quote:
No lube needed. O-ring and a pressure washer - but reloading might take more time ...
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#50
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Yeah, the grain print was expected, I got a lot of different mahogany pieces with different hardness and density and that one was not good. The first punch was real good in terms of wood quality, but I just forgot that the sanding after turning, would decrease diameter so it got just a tiny bit too small which is showing in the final part. I do have a limited amount of both nylon, aluminium and steel to make the punch from, but I would rather save those pieces to make a part that can't be replaced with wood. I have more wood to try out before I'm 100% satisfied. Maybe I'll even upgrade the ball turning tool post I made along the way.
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Martin |
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