Re: [CAD_CAM_EDM_DRO] Minertia Servos on RF-31 mill?

Alan Marconett KM6VV wrote:

> Hi to the list,
>
> I have been doing some "background thinking" on adding motors (stepper?
> servo?) to my recently purchased RF-31 mill (happens every time I run
> it, and have to crank the X axis back and forth). I happened to think
> of the servos on the Daisy Wheel printers I have stashed in the garage,
> and some similar ones I bought at an auction for robot projects, about
> 12 or so years ago.
>
> I have half a dozen or so MinertiaMotor T06M-Qu12 21v, 1300 rpm, 61
> oz/in servo motors, some used in daisy wheel printers. They are 3.25"
> dia, by 3.25" long. The ones from the printers have an analog shaft
> encoder, but not my new ones. I'd have to figure out a mount for them,
> and the biggest problem would be to get the cable pulley off the motor
> shaft (some kind of straight knurls), and a proper pulley installed. I
> think they will make good servos.

These are pretty good motors. I have used some Yaskawa proprietary
motors from Qume daisy printers. I cut the pulley through one side
with a broken-off hacksaw blade. (I may have milled most of the way
down to the shaft first. I drove a large screwdriver into the slot, and
the pulley came off rather easily. I adapted a standard encoder to the
back.

>
> OF COURSE, I'll want Gecko G3xx drivers! Do I need to use a encoder to
> initially drive them (just having a "power drive" of the X axis would be
> a great help)? I have a pair HEDS 6100 shaft encoders, but they take
> 1/4" shafts. How to mount them? Or how to interface the "analog"
> encoders present on some of the motors? This project may take a while!

You could turn the back shaft down to fit a HEDS encoder wheel.

Jon