- Joined
- Dec 25, 2011
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- 10,513
Now that's what I would call good luck! Although with a 4-jaw, it isn't that critical, I would check the runout on the OD of the chuck body with it mounted to the back plate in each of the n possible orientations (n = the number of mounting holes, assuming that they are all evenly spaced on a single circle). Then use the position with the least chuck body runout. And match-mark the chuck and plate in case you ever need to remove the plate for any reason. Do the same for the 3-jaw in case you ever need to go back and use it, except that the runout measurement should be made on an accurately ground test bar (NOT on something turned in the chuck) and not on the chuck body.