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

Hi Bob,

The steppers are 200 steps/inch in 1/2 step mode. i.e. 400 steps/rev. that
gives me .01mm/step

The servos are 250 ppr. That gives me .016mm/Step

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

> -----Original Message-----
> From: Bob McKnight [mailto:bobmcknight@...]
> Sent: Thursday, 15 January 2004 2:17 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: 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?
> Send reply to: CAD_CAM_EDM_DRO@yahoogroups.com
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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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