Re: [CAD_CAM_EDM_DRO] Re: 4th Axis Concept (long)

Roger,

You've hit this issue in it's entirety: After "Lathe Mode" you need to
*reset* part 0. That is precisely what needs to be eliminated to """automate
the process""". It is possible to use a servo, but still with the clutch and
2 motor scenario.

keep the ideas rollin' !

Chris

vrsculptor@... wrote:

> --- In CAD_CAM_EDM_DRO@y..., datac@l... wrote:
> > In the following explanation, picture in your minds 2 motors
> driving a Sherline or similar Lathe spindle, First motor: a dis-
> engagable stepper, The Other: A traditional spindle drive motor....
>
> Chris,
> Interesting idea. If I where to do this I would use a servo motor
> instead of a stepper. A servo motor with encoder can be controlled
> with a Gecko 340 using step and direction input just like a stepper.
> When in lathe mode just switch out the controller and apply DC
> directly to the servo. You could get the RPM you need without having
> to clutch a motor in an out.
>
> There is still the problem reseting the piece to zero. I think this
> could be handled by turning off the power and rotating the shaft by
> hand to a known position. A fixed position could be established by
> resting an arm, attached at a right angle to the 4th axis shaft, on
> the top of a 1-2-3 block or some such.
>
> Roger
>
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