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

To: <CAD_CAM_EDM_DRO@yahoogroups.com>
From: "Peter Homann" <peter.homann@...>
Date sent: Thu, 15 Jan 2004 12:22:24 +1100
Subject: [CAD_CAM_EDM_DRO] Is a reduction drive
necessary for servo motors?
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Peter

It looks like you would have to know the number of steps
per revolution of both the stepper and the Servo. I am
not sure how the servos are rated , but the steppers are
usually rated in degrees per step or steps per revolution.
I have been led to believe that steppers tend offer a smaller
incremental movement than Servos

Bob McKnight
Hi,

I'm looking at upgrading a CNC lathe that currently has 210 oz/in
steppers to servo motors.

The servo motors are rated at just over 300 oz/in.

The current stepper set-up is direct coupled using zero backlash
flexible couplers. The ball screws have a lead of 4mm/turn.

As the servos appear to be more powerful than the steppers, I feel I
should be able to do a direct replacement, but have not used servos
before.

Do I need to use any gear reduction, or can I direct couple the servos
via the flexible coupling as is done with the existing steppers.

Any help or comments appreciated.

Thanks,

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


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