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Are there any methods to remount soft jaws without boring them yet holding under 10microns concentricity?
Mark them 1, 2 & 3 and put them back in the same place. Note the chuck pressure too. Should be close to last time.
The serrations do a good job locating the jaws radially and axially, but the jaw nuts do all of the side to side locating. Nuts need clearance, and that clearance translates into azimuthal positioning error. It's not much, but to consistently get under 10um, you would need tighter fitting jaw nuts than standard. It doesn't help that on a lathe, positioning error gets doubled when measuring diametric runout.
If you don't have a lot of parts to make and can spend a few extra minutes, chuck the part under low to medium pressure and tap it into position with a brass hammer and test indicator, then set the chuck to working pressure.
I've had good results by:
1. turn the chuck pressure way down.
2. just barely tighten the t-nut screws.
3. chuck a part.
4. tighten the screws you have access too.
5. remove part and tighten all the jaw screws.
6. turn up chuck pressure to normal.
Just bore them, that's why they are called soft jaws. Repeatability to .0004" would be interesting, amazing, unlikely, fantastical, unrealistic or just a waste of time. I can bore jaws in about 2 minutes, I have a jaw boring macro that I input the starting diameter and the depth and the chucking diameter, away I go.
Robert my ±2
You need to clearance the corner for a sharp part?
You need to clamp on more than one diameter?
At the same time? That's a "machining 101 no-no".
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