DIYbanter - View Single Post

wrote:

This is a pretty good technique. It's perhaps
worth emphasising that it removes the length uncertainty
that's always present when turning between centre points.
With centre points the bar pivots about a point a bit inside
the pivot hole so the effective length is always an
uncertain bit less than the overall bar length.

With balls this is not a problem. The measurement
of overall length with both balls in place less 1/2d +1/2d
(d=ball dia) precisely defines the effective length.

With this checked with a decent vernier and the
offset set by gauge blocks pretty precise tapers are
possible.

Exactly!
thanks,

Ken

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take da "ma" offa dot com fer eemayl