[ Return to Main Page ] [ Return to Projects Index ] [Doc's Machine & TWB Store] [ Contact Us ] [ The Whiteboard Webcomic ]

Converting a Grizzly G8689 Mini Mill to 3-axis CNC, Part 11:



Once suitably bandsawed and milled square...



I marked a likely corner spot, and drilled and tapped two holes, and drilled through two other holes.
The center was also marked and drilled.



After some quick checking, the center was then drilled out and then finish bored with a 1" endmill to clear the clamping nut I'd made.



After the mounting block was milled down again to make up for the extra thickness of the new plate, it all goes together about like this.



After that quick check, the bearing block was removed, the center bearing hole located, and from there,
the lower two holes were measured off with the DRO and drilled & tapped.



Then, using a couple of countersunk screws to center and hold the new plate in place- and with a Vise-Grip to add a little extra security...



Two more countersunk holes were drilled and tapped, carefully to try and avoid the bolt and the bearing.



And finally, after a quick cleanup and blow-off, we were ready to assemble.



The bearing block goes back in place like usual, and the new plate bolts over the top of that like so.



The stepper is slipped into place, and the top two bolts thread into the plate, while the bottom two,
being slightly longer, pass through and thread into the bearing block.



Then, with a flashlight, one reaches up through the bottom slot in the mount to tighten the clamping screws on the coupler.



And Voila`! Nice and strong, closed to chips and junk, and should be concentric to within a few thousandths.

Next up, the X-axis mount!






All text, photos and graphics Copyright 1998- 2019, Doc's Machine & Airsmith Services. All Rights Reserved.
Information contained in these pages is for reference and entertainment purposes only.  Our methods are not always the best,
quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
Keep your fingers away from the spinny blades o' death and you should be all right.