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Converting a Grizzly G8689 Mini Mill to 3-axis CNC, Part 3:
And then, after lunch, I found a suitable block for the ballnut mount, and drilled and bored a hole to fit.
That will go on like so.
Locate and tap four 8-32 holes...
And bolt 'er together with four 8-32 buttonhead screws.
After that, I dropped a parallel across the top to make sure it was square to the saddle,
and marked the bottom edge of the saddle casting.
After a couple careful cut-and-try cycles, I got the fit close enough
that the saddle just scratched
the top of the block as I slid it over
the top.
cranking the nut to the far end of the screw, I basically butted it up
against the inside of the casting, which showed pretty
much the absolute
maximum travel. I lined up the saddle with
its max-rearward
position, aaaand... had to make some
educated guesses, since it was very
hard to actually properly measure anything under there,
and virtually
impossible to accurately even just scribe a line.
Fortunately I'm very good at "winging it", and drilled and countersunk a couple of convenient mounting holes for the block.
Those holes got carefully transferred over to said block, which was in turn drilled and tapped.
After that, I wiped everything off, blew out all the schmutz, and popped
it all back together.
I dropped the gib in and one adjuster (since
that's all I could find ) and tried 'er out. Everything
seems to move
smoothly with no binding at any point in its travel. So far, so good.
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