Re: [CAD_CAM_EDM_DRO] Milling Machine info needed

R Petersen wrote:

>Jon,
> The stepper motors control the bed in/out,
>left/right, up/down, spindle speed, spindle up/down.
>The motors measure 7 1/4" long, 4 1/8 dia.,
>

OK, those are known as NEMA size 42 motors.

> 8 wires
>hooking up in the back in a "U" shape configuration
>numbered from left, 71562438. Back cover is flat.
>Color is blue/grey.
>

The blue/grey is the central cylindrical section, with bare aluminum
end covers? That VERY strongly suggests Superior Electric motors.
Those should be fairly easy to figure out the specs for.

> No nameplate at all nor sticker.
>The machine nameplate is Autonumerics Inc, Positool
>Model# S-2. I'll be getting photos of the machine and
>motors today. BTW, what's VFD?
>

Variable Frequency Drive. It takes in single- or 3-phase power, converts to
DC, and then generates a synthetic 3-phase output of varying voltage and
frequency. You can run standard motors from about 20-30% of rated
speed up to 150% or more if you dare. If you have a belt drive with step
pulleys, you can often leave the belt in one place and dial the speed up
and down
with the VFD for most purposes. I'm guessing you have a belt-type
variable speed drive, with the stepper driving the belt up and down.
EMC doesn't directly support this, but it would be pretty easy to
throw together some external circuits to pulse a stepper driver from
the speed-up/speed-down signals that EMC does provide.

Jon