On 22 February 2018 at 18:27, Chris Albertson <albertson.ch...@gmail.com> wrote:

> That is what I'm making too.  A rotating ball nut.   I looked at all the
> ways there are to lift the head of a Siege X2 mini mill and I think the
> question comes down to the location of the screw.  I think I will use the
> space occupied by the factory installed column mounted rack.

I put the screw inside the column:
https://photos.app.goo.gl/HoPVUgjsAEOLwd293
With a shim strip in a tunnel to cover the slot:
https://photos.app.goo.gl/B8maY510qUPx00Qw1
It looked quite neat but was a terrible idea. Cutting the slot in the
middle of the dovetail massively reduced the torsional rigidity of the
column.
So don't do that :-)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916

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