On Sep 27, 12:38*am, Joseph Gwinn wrote:
In article
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*Vernon wrote:
At an internet auction a few days ago I bought a KBC bench mill. *The
model is Grip-16.

The pictures neglected to show a view of the mill that is clearly
stamped "3 phase". * I thought the motor was single phase because the
auction listed it as "230v". *Until today, apparently in error, I
thought that 3 phase motors were 208V.

However, the KBC tools web site for this mill almost leads me to
believe that the motor can be wired for single or 3 phase.

Will somebody help me out here? *A motor is either single or 3 phase
but can't be changed. *Yes?

I already understand that a 3 phase machine can be operated from
single phase with a phase converter. *And I may have to go in that
direction unless I can get a single phase replacement motor.

This mill was built in 1989. *Since even when new it wasn't a high end
precision machine would it be prudent to check the accuracy of the X Y
table? *As we get deeper into machining I'm sure I will join the quest
for split hair precision. *But for now, we just wanna play.

On Monday I will call KBC and look into my options. *But meanwhile,
any advice on how to logically approach the aftermath of a possibly
illogical purchase will be appreciated.

Buy a VFD to run the mill. *Three phase works very well. *Many VFDs can
be driven from 220 volt single phase, with a derating.

Joe Gwinn- Hide quoted text -

- Show quoted text -

Joseph,

I'm still trying to wrap my electrically challenged brain around the
differences / advantages / disadvantages between rotary converters and
VFDs. As soon as I'm able to articulate an intelligent question I'll
ask one!

V