RE: [CAD_CAM_EDM_DRO] Is a reduction drive necessary for servo motors?

Hi Jan,

When I said Open-loop threading I meant that the Z axis is not coupled to
the spindle as happens on a manual lathe. Mach2 software controls the speed
of the Z-axis by measuring the spindle speed, then determining how fast to
move the Z-axis to get the commanded thread pitch.

The coarser the thread pitch, the faster the Z-axis needs to move. This is
why I am considering servos.

Sorry for the confusion.


Peter Homann
mailto:Peter.Homann@...
Adacel Technologies Limited,
250 Bay St, BRIGHTON, 3186, AUSTRALIA
http://www.adacel.com <http://www.adacel.com>
Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960
Mobile 0421-601 665

> -----Original Message-----
> From: JanRwl@... [mailto:JanRwl@...]
> Sent: Thursday, 15 January 2004 3:02 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Is a reduction drive necessary for servo
> motors?
>
>
> But servos are NECESSARILY "closed loop" (with shaft-encoders).
> It is the
> STEPPERS that are "open loop"! JRR
>
>
> [Non-text portions of this message have been removed]
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