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| Turning concentric bearing pockets |
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| Lykle:
OK, I am making a stainless steel cylinder that has two bronze bearings on both ends, inserted in pockets. Overall size is round 55 mm and length is 60 mm, pockets are 30 mm diameter and 17 mm deep. There is a through and through hole of 22 mm. Now, I did the outside and it seems to be nice and clean and straight. Then I kept it in the chuck and drilled and bored the 22 mm through hole. Now, to keep left and right pockets concentric I decided to mount on a expanding mandrel. So I made one and tested it out, it works and with the bolt tightened, the outside is nice and parallel and 22 mm. So I mounted the part on the mandrel, held in a collet chuck. What a wobble! It really is wobbleing (hmm spell check does not like that word, neither do I), but why? I will go back and dismantle everything and recheck everything but I don't get it. All was straight and aligned when I started. Any ideas or suggestions where to look? For now I think I will simply mount my normal chuck again and align the shaft. It is nice and thick and not too long, so I should be OK. Brings me to another question I have, but that is the next post. Lykle |
| RussellT:
--- Quote from: Lykle on March 20, 2013, 11:03:21 AM ---It really is wobbleing (hmm spell check does not like that word, neither do I), but why? --- End quote --- Try it without the "e". Russell |
| sparky961:
Pictures would help here. I can't quite envision what you're describing. |
| BillTodd:
Best to line-bore this sort of thing: This is how I bored the motorcycle headstock for the frame of my brother's HL500 replica |
| Jasonb:
When you made & tested the mandrel was it in the same collet chuck or did you make it in the 3 jaw and then use it in a collet? How good a fit is the cylinder on the unexpanded mandrel, if you are having to expand it too much by a bolt a t one end then it will mean teh ctylinder ios flapping around at the chuck/collet end. |
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