| Gallery, Projects and General > How do I?? |
| Making an accurate spindle with an innacurate chuck. |
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| Fergus OMore:
It is some time since I accessed Mr Morans's site but he goes into how he made a couple of spindles- using two different techniques. He used ball races but I notice that he was also making something more solid- on the lines of the Cleeve steady which I have mentioned. N |
| The Steamer:
Is the 4 jaw self centering or independent? |
| S. Heslop:
--- Quote from: AdeV on November 20, 2013, 05:40:14 PM --- --- Quote from: S. Heslop on November 20, 2013, 03:33:26 PM --- but I figure my problem is that my 4 jaw chuck is too wobbly. I was reading a 0.10mm wobble over 90mm of the bar. --- End quote --- That's a hell of a wobble... have you got a bit of swarf trapped between the lathe spindle & the back of the chuck perhaps? Was it a brand new chuck? i.e. any chance of returning it as not fit for purpose? --- End quote --- No swarf as far as I can tell. It's been this way for a while. Come to think of it, one of the first things I made on the lathe was the 4 jaw backplate. I should probably take a closer look at it to see if I made any obvious mistakes like leaving a burr on or if any of the cap head screws are sticking out. But after my attempt at grinding the thing, i've probably already messed the chuck up enough to make that pointless. --- Quote from: Fergus OMore on November 20, 2013, 05:49:21 PM ---Probably your lathe is bending under the weight and strains- like his was. --- End quote --- There's a good chance the bed is twisted. The lathe isn't mounted very solidly for starters. I bought a precision level at a car boot sale so if I ever get around to making a proper stand for the lathe I should hopefully have everything i'd need. In all honesty I don't use the lathe that much. Not enough to justify spending so much time getting it working perfectly. It's even rarer that I require much accuracy from it. --- Quote from: The Steamer on November 20, 2013, 06:20:47 PM ---Is the 4 jaw self centering or independent? --- End quote --- It's independant. |
| lordedmond:
bingo what did you make that back plate of ? I will bet its warped/stress relieved itself pop off the chuck and reface your back plate and mark it some way as to get it back on the same position I bought some back plate for my myford big bore from the new myford machined them up all good about six months later chuck run out did the face again ( it was out ) they did it again six months on this this they are OK . They do not age the castings in china or wherever they get them from Stuart |
| S. Heslop:
It's made from 5 inch diameter EN8 steel. It took me two days to saw through it! I didn't imagine such metal would warp. So I took the chuck off and measured the runout on the backplate and it was about 0.02mm, which was a fair bit. So I refaced it, put the chuck back on, and chucked something in the jaws... ...and now the bar wobbles 0.37mm over 90mm! That might be the result of my stupid grinding attempt. I'd say lesson learned but I think my only option now would be to try grind the jaws again. Or I could try reversing them to see if that improves any. |
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