11-25-2016, 08:22 PM
1) Make dimples on the face of the protrusion very close to the edge with a center punch. I recommend 8 dimples fairly equally spaced. You'll probably have to "turn" the diameter again to avoid a excessively tight press fit.
2) Use .0005" thick shim stock about 1/2" wide and place 3 pieces equally spaced to "tighten up" the diameter.
3) Try some Loctite for bearings to improve the fit.
4) Build it up with silver solder as that should not be hot enough to warp the plate, then turn to size. You'd need to pre-heat the plate.
BTW, I second the idea of cutting off the existing protrusion and repeat the process. Personally I've had the best results simply making sure the spindle nose and the back of the plate are as clean as possible. Then rough it in 050" or so oversize. Leave it on the lathe until it has cooled down to room temp then take the finish cuts.
I also typically make an undercut in the corner using a grooving/parting tool with the compound set at 45 degrees and the same for the cutting tool before making the final cuts.
2) Use .0005" thick shim stock about 1/2" wide and place 3 pieces equally spaced to "tighten up" the diameter.
3) Try some Loctite for bearings to improve the fit.
4) Build it up with silver solder as that should not be hot enough to warp the plate, then turn to size. You'd need to pre-heat the plate.
BTW, I second the idea of cutting off the existing protrusion and repeat the process. Personally I've had the best results simply making sure the spindle nose and the back of the plate are as clean as possible. Then rough it in 050" or so oversize. Leave it on the lathe until it has cooled down to room temp then take the finish cuts.
I also typically make an undercut in the corner using a grooving/parting tool with the compound set at 45 degrees and the same for the cutting tool before making the final cuts.