D1-3 Camlock Backplate Fix

[ronboult]

Hi John
Thanks for a very interesting post.
My interest is in why the D lock mechanism did not accurately locate in the first place.
It is my understanding that with a D lock mount it is the taper that actually locates the chuck BP and that there should be a small gap behind the BP when locked up to allow the taper to produce the location.
Could it be that your problem was not the gap but that the taper in the BP did not exactly match your spindle hence the slight wobble?

If the taper is over enlarged then the BP will locate against the flange of spindle but the taper will not prevent radial runout

Any thoughts?
Ron