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| Fixing Ralph's Chucks |
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| Bogstandard:
John, Could you please elaborate a little. I couldn't understand where the ring is supposed to fit. Did you mean right down the hole, at the back, where the scroll is? I will always bow gracefully if a new and better way is shown to me. :bow: Sorekiwi, I would wait for John's answer first, his method might be a lot better. John |
| Stilldrillin:
John B. I was taught to nip on a ring/ disc, held behind the working area of the jaws, inside the chuck bore. Never thought to do it any differently....... David D |
| John Stevenson:
John, You need to get thru with the grinding wheel so you can't grip on the holding part of the jaws or you get a step so the only part you can grip in is the bottom of the teeth of the jaws, often these are relieved back a bit which makes it easier to slip a ring in. John S. |
| NickG:
I was thinking the same as any backlash in the scroll is taken up in the correct way it would normally work gripping on the inside of the jaws. You could grip something right at the back and relieve it afterwards but as Bogs said, you don't need to go mad with the tightness so I guess gripping with the teeth should be ok. Anyway, this way worked well and as bogs said, it only corrects it for the position you grip in, the rest is down to the accuracy of the scroll and Jaw teeth. Just over a thou run out is as good as it'll get I would have thought. Nick |
| Davo J:
--- Quote from: John Stevenson on January 09, 2011, 07:01:17 PM ---John, I was told when grinding chuck jaws you had to load up in the direction they are closing because of any differences in the scroll. Using a ring on the outside of the jaws is forcing the jaws open but you are grinding the part the is the closing element. We were told to put the ring inside on the bottom of the jaw teeth, doesn't matter if the ring doesn't run true the jaws will do. This way you still have clearance to get all the way thru to clean the jaws up. --- End quote --- That's the way I have always done it, though I see plenty doing it this way. Over here they sell these for CNC aplications. https://www.machineryhouse.com.au/Products?stockCode=L763 Dave |
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