Re: [CAD_CAM_EDM_DRO] Re: G320 Keeps Losing Position!!!!

Most encoders specs have a limits on how much axial movement is allowed. For instance a US digital E2 encoder has a maximum axial play of +/-.010" and the maximum eccentricity of the shaft be not more than .004". A problem with either of those two parameters could cause disk to encoder read head error.
Dan Mauch
economical 3D scanner software and kits
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch

----- Original Message -----
From: shadi_salhab_78
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Saturday, April 26, 2008 8:19 PM
Subject: [CAD_CAM_EDM_DRO] Re: G320 Keeps Losing Position!!!!



Dan ,
What do you mean by " there isn't excessive end play in the motor" ?

Ive been driving the same motor with Rutex board Successfully, when I
faced same issue then I switched to G320 !

Shadi

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dan Mauch" <dmauch@...> wrote:
>
> Your description of "I suspect
> noise problem : the only observation I can tell is that the motor
> sounds like hurt pulsing when it stops , If I move it a little the
> pulsing sound stops for several seconds then restarts !!!! Is That due
> noise ? "
> Sounds like normal dithering .
> I would make sure the X motor and encoder cable are seperated by
several inches. Make sure the encoder cable shield is only grounded on
one end.
> Last take a lok at the X motor and make sure that there isn't
excessive end play in the motor. You will need to check the specs of
your motor to check that.
>
>
> Dan Mauch
> economical 3D scanner software and kits
> low cost stepper and servo motors.
> cases for Gecko drives
> kits and assembled 3-4 axis drives
> www.camtronics-cnc.com
> www.seanet.com/~dmauch
> ----- Original Message -----
> From: shadi_salhab_78
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: Saturday, April 26, 2008 1:39 PM
> Subject: [CAD_CAM_EDM_DRO] G320 Keeps Losing Position!!!!
>
>
> Hi all ,
> Recently I've installed two G320 drivers on identical x and y axis DC
> motor ,
> the Y work perfectly but the x axis motor loses position I suspect
> noise problem : the only observation I can tell is that the motor
> sounds like hurt pulsing when it stops , If I move it a little the
> pulsing sound stops for several seconds then restarts !!!! Is That due
> noise ?
> I grounded the shield at the driver side , and shorted the cable to
> minimum (about 5 feet) but no effect , I replaced the encoder also no
> effect !!! , I switched the drivers it keeps with the x axis motor !!!
>
> What other factors I'm missing here Is it noise or maybe a faulty
> motor?!!!
> Can I put a pull up resistors for the AB encoder channels? does this
> supports the signal ?!!!
>
> I'm totally lost and this machine has to be working soon So pleas help
>
> Thanks,
> Shadi
>
>
>
>
>
> [Non-text portions of this message have been removed]
>





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