Re: [CAD_CAM_EDM_DRO] Encoders on stepper motors.

Dan,

Please comment on this configuration:

EMC outputting step/direction, driving a gecko 340 drive, with the encoder
feeding both the gecko drive and your emc/encoder feedback board.

Thanks,

Tom Eldredge

----- Original Message -----
From: Dan Mauch <dmauch@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, March 25, 2001 11:45 AM
Subject: Re: [CAD_CAM_EDM_DRO] Encoders on stepper motors.


> In a properly constructed driver, with the properly set software
> configuration and a proper machine you shouldn't lose any steps, however,
> in addition to what other folks have mentioned there is stepper motor
> resonance problems to content with. Just take some steppers and lay them
on
> the bench and do a G02x1.y1.i2 command and watch the motors as the
> transition from one direction to the other. That is generally when you
will
> note stepper motor resonance. The use of encoders and the software that
can
> utilize encoders helps, if not eliminates this problem. Deskncrt and EMC
> both use the Kulaga/Mauch DRO boards to take encoder feedback and compare
it
> to values set in the .ini files. If the error is greater than the
> zero(error) it tries to speed up the motor and if successful continues the
> toolpath. If the error is greater than the set value then the program stop
> all three axis and an error message is displayed. If you want to add
encoder
> feedback to your program MC5 then I would be willing to donate an
assembled
> board for the task. I guess the source code can be found in EMC
> Dan
> -----Original Message-----
> From: Art Fenerty <fenerty@...>
> To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
> Date: Sunday, March 25, 2001 8:31 AM
> Subject: [CAD_CAM_EDM_DRO] Encoders on stepper motors.
>
>
> >Hi All:
> >
> > I might be missing something here. I have heard alot about encoders on
> stepper motor systems increasing accuracy. Am I wrong or is the only
purpose
> of an encoder in a stepper
> >motor system only used in the case of a stepper missing pulses? If the
> stepper never misses a pulse, the encoder does not do anything. The motor
> can only be positioned to a multiple of its stepping resolution, right? If
a
> motor misses pulses, isn't this an indication of a poorly powered stepper
> >system? I get the strange feeling I'm missing something obvious.
> >
> >Thanks,
> >Art
> >
> >
> >[Non-text portions of this message have been removed]
> >
> >
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