On 2010-07-26, Ignoramus1880 wrote:
Yes, the spindle is a splined, two part thing and the hollow top of
the spindle stays in place, regardless of the Z axis position (bottom
part).

This means that mounting an encoder on the top is very easy, just a
little machining exercise to make something that I can stick inside
and make it stay connected to the spindle, with some little top piece
to mount encoder wheel.

Great!

Enjoy,
DoN.

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