Re: [CAD_CAM_EDM_DRO] Re: using a stepper motor for spindle on a lathe

Keith, Bob,

If you use a step/dir servo drive, then the step/dir signals could be
routed THROUGH a PIC or other uP from the CNC controller program, or the
PIC could generate it's own variable speed (and direction) steps,
adjusted by a pot.

I'M LOOKING for a servo motor w/ encoder of about 100 watts as a
replacement for a Sherline spindle motor on my lathe.

I already have a PIC program that can generate acceleration/deceleration
ramps and controlled by a pot, and Dave M. has milled a "piggy back"
board to fit on the back of my LCD to run the code. The LCD wouldn't be
necessary, but is useful.

A simple PB or switch will signal the PIC to change from "Stepper
Pulser" to "pass through" modes.

Alan KM6VV

Keith Clark wrote:

> Bob,
>
> At this point is seems like 2 motors might be necessary unless a servo
> motor could accomplish both. I am going to look at trying to control
> the existing spindle motor fist, then seek out a stepper or servo as a
> second motor. I'll have to figure how to do the wiring as you
> suggested. I might be able to control the switching with the computer
> through relays. The machine has great potential and might even be
> able to do hollowing.....
>
> Thanks,
> Keith
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, bobmcknight@c... wrote:
>
>>I think that you would definitely want two motors on the spindle.
>>I think I would have two configurations that could be hard wired
>>and switched manually or wired with patch cords.
>>With the router motor supplying the cutting power, the spindle
>>motor would basically just determine how fine the finish is.
>>With the stepping motor driving the spindle, you could do your
>>rope patterns, fluting and engraving. With a motor driving the
>>spindle you could do more conventional turning and bowl turning.
>>Do you ever do any hollow jug turning? Sounds like a real
>>versatile machine that can handle some large projects.
>>
>>bob mcknight

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