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Converting a Grizzly G8689 Mini Mill to 3-axis CNC, Part 3:

Grizzly G8689 CNC Conversion

And then, after lunch, I found a suitable block for the ballnut mount, and drilled and bored a hole to fit.

Grizzly G8689 CNC Conversion

That will go on like so.

Grizzly G8689 CNC Conversion

Locate and tap four 8-32 holes...

Grizzly G8689 CNC Conversion

And bolt 'er together with four 8-32 buttonhead screws.

Grizzly G8689 CNC Conversion

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.

Grizzly G8689 CNC Conversion

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.

Grizzly G8689 CNC Conversion

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.

Grizzly G8689 CNC Conversion

Fortunately I'm very good at "winging it", and drilled and countersunk a couple of convenient mounting holes for the block.

Grizzly G8689 CNC Conversion

Those holes got carefully transferred over to said block, which was in turn drilled and tapped.

Grizzly G8689 CNC Conversion

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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