[dan_the_welder]

This is the after shots, too many perhaps, but maybe it will help someone.

[dan_the_welder]

Zay7032g came from harbor freight. Got the CNC a while ago but I just upgraded the z axis recently.

The old z setup had about .250 of stick slip and slop. Not surprising, given the two pulleys, worm and gear, and then rack and pinion that the motion had to travel through.

The x and w mounts are pretty crude but they work fine.

[dan_the_welder]

Piece of 1/2" cold rolled steel cross drilled for a bit. Just a little sharpened piece high speed Steel. The black thing clamped to the quill with the vice grips is just a weird chunk of stuff with two half inch bearings in it. I can slide the boring bar up and down. I made a couple passes. I was less worried about a creating a particular dimension than creating a clean bore because I could turn the inner piece to fit it exactly. Later when I was doing the upper and lower face I made that bronze bushing to keep the boring bar centered.

I also I also turned that piece of aluminum which I'm using to sand the bore. I put little pieces of sticky back sandpaper on it and cleaned up the scoring. I turned it a little bit under-sized to allow for the Sandpaper and I could adjust the fit by the width of the Sandpaper strip. I'm also using a sanding drum to clean up the faces, that didn't actually work at all.

The faces were the hardest part and in the end I was forced to resort to a big facing cutter I have. The single point (edge?) cutter was bouncing up and down making those lines. Thinking about it afterwards perhaps a clamp on the boring bar and a spring would have allowed me to even things out. I just put the facing cutter on the sanding arbor after I turned it down, in the cordless drill and used the bronze pilot to center it.

[dan_the_welder]

Okay, turned that bronze pivot pin that I got from the flea market down so it fit in my newly bored hole. Threaded the end, made a nut, bored it out and tapped an Acme thread, turned the head to take an XL pulley.

Later I decided on a larger pullly and I had to cut back the cast iron a bit. I used a thin abrasive wheel on a grinder. No big deal and the lock still works fine. If necessary I could have around the corners of the Lock Pins a little bit.

The rest is just mounting the motor with a little bit of 8020 and some aluminum plate. I need to make a new Nema 34 plate, a symmetrical one and reattach the front cover and put a high limit switch on that Acme screw nut.

Conclusion? It kicks ass it's a hundred times better than the old setup it was a huge pain in the butt to build particularly the boring but completely worth it. Hit me up if you got any questions.