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Hitachi has WJ200 series VFDs that will run on single phase and output 3 phase.

I finally milled some steel today with my modified spindle drive.
I made some changes to the original design.
I am now using an Arduino Mega board with 2 additional boards.
1 x Mega protoshield...

I hit upon the same solution on my own. I made an adapter plate to mount the motor, Bored out the old pulley, plugged it, re-bored to 0.625 and re-cut a keyway.
I am using an Arduino to measure the...

I used the old pulley. I had some 1 1/4 bearing bronze. I bored out the old pulley, made a bronze plug and bored it to 5/8. I cut a new keyway with a broach from Travers.

I have a Mikini 1610. When I got it the coupler was loose on the x axis drive and also on the z axis drive. While fixing the z axis I looked at the top of the ball screw. It looked like someone had...

You might try installing Linux on your PC as a dual boot with windows. Then download CNCLinux. It takes some patience to configure. I wonder if someone out there is using it on a Tormach. If so they...

I am using LinuxCNC to drive my Mikini, it took me a few hours to configure but works perfectly. Also it is free as well as Linux. I use Linux Mint. Regarding the Mikini, it arrived with several...

You can always use a calculator.

Seems odd that it is exactly double the second time. What is the pitch of your ball screw?
I was going to ask also if you are using a center cutting end mill and whether you have checked the...