 | Adjustable Backplate Ref: HK 117X
Self-centering chucks rarely run 'spot on'. Commercial chucks do exist, which feature inbuilt adjustment to correct for radial run out.
Our solution to the problem of run out is by means of an adjustable backplate, which uses your existing chuck backplate and an intermediate iron disc. The mechanism can be centred precisely under the control of 3 fine pitch screws. Not difficult to machine. Our Pratt Burnerd Ø5" chuck now repeats to within .0002", making collet set-ups seldom necessary.
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