[zoltank]

I'm getting ready to upgrade the my mini mill with a KB driver. I see the KB boards are available in 90VDC out up to 125VDC out. The motor on my mill is labeled 110VDC, but it's also labeled 4/5HP and I know that's a joke.

Could someone please tell me if the stock mini mill motor is 90VDC or 110VDC?

[Al_The_Man]

The KB SCR bridge type are 90vdc and the PWM 125v PWM, if you are concerned about a motor that is 110vdc it is not problem as the drive can be set for max rpm.
Al.

[zoltank]

Well, the cheapest KBIC I found was a KBIC-125 uprated to 125VDC, so no worried there.

However, I'm now looking at upgrading my mini lathe with a KBIC as well, and would like your advice on which HP resistor to install. From the information on the label, I believe it's the 350W variety. I think that makes it just shy of 1/2HP (even though the label says 3/4HP). Would you recommend I use the KB 1/2HP resistor or the 1/3HP resistor?

Attachment 346128