Re: [CAD_CAM_EDM_DRO] dual function lathe spindle

Hi John,

My Asian 7x14 CNC ready lathe came with a 2000 ppr quadrature encoder on the
spindle.

Cheers,

Peter.

Jon Elson wrote:

> scyvt wrote:
>> An Emco CNC lathe with live tooling that was in a school shop I had access to a few years ago seemed to mechanically switch between these two drive systems to alternate functions, perhaps with electromagnetic clutches. However, lately there seem to be videos on the web showing both lathe and 4th axis spindles making this switch between functions seamlessly. The only sort of drive that I can possible imagine doing both would be a servo drive, but holding a static position would be problematic, as the servo motor, unlike a stepper, would be constantly hunting, wouldn't it?
>>
>>
> Servos ARE constantly hunting, anyway. The trick is to make sure the
> hunting is of such small magnitude it doesn't bother what you are trying
> to do. Often just a higher resolution encoder is needed to reduce the
> magnitude of the movement.
>
> Jon
>
>
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