wr4t
Aluminum
- Joined
- Dec 23, 2008
- Location
- Cincinnati, Ohio
Greetings,
I recently purchased a new Bison 5" 5C Set-Tru collet chuck with an L00 backplate. Took a skim-cut on the face of the back plate to eliminate about .001 of axial runout when mounted on my spindle. The chuck was mounted and zeroed for < a tenth of run out on the inner 5C taper. Mounted a 3/4" test bar in a collet with less than 2 tenths TIR 1" from the nose.
Now my question, after unmounting and remounting the chuck on the spindle I typically measure about .0007 of runout on the 5C taper, worst case about a thou and 2 thou TIR on the test bar. This is good enough for about 80% of the work I do, but not when I need to flip and re-chuck a part.
Is this repeatability typical for this setup? Am I going to need to redial this in every time I mount the chuck and have one of these re-chuck jobs or, is there a possible issue with the taper mount on the spindle or chuck? TIR on my spindle is < a tenth, no burrs, super clean.
Ted
I recently purchased a new Bison 5" 5C Set-Tru collet chuck with an L00 backplate. Took a skim-cut on the face of the back plate to eliminate about .001 of axial runout when mounted on my spindle. The chuck was mounted and zeroed for < a tenth of run out on the inner 5C taper. Mounted a 3/4" test bar in a collet with less than 2 tenths TIR 1" from the nose.
Now my question, after unmounting and remounting the chuck on the spindle I typically measure about .0007 of runout on the 5C taper, worst case about a thou and 2 thou TIR on the test bar. This is good enough for about 80% of the work I do, but not when I need to flip and re-chuck a part.
Is this repeatability typical for this setup? Am I going to need to redial this in every time I mount the chuck and have one of these re-chuck jobs or, is there a possible issue with the taper mount on the spindle or chuck? TIR on my spindle is < a tenth, no burrs, super clean.
Ted