RE: [CAD_CAM_EDM_DRO] Re: Z axis stepper motor getting lazy....

Oh, I did not mean ballast resistor. Even in the chopper driver, you would
set up maximum current to match the motor capacity. Gecko type drivers
require you to attach an external resistor to limit the current. There are
other drivers that would provide a potentiometer or a gang of resistors to
select from. A simple check could save you lots of trouble.

Dhiren Shah, Dir., Operations
Solustan, Inc.
165 Chestnut St., #200, Needham, MA 02492
PH: 781-449-7666 FAX: 781-449-7759
WWW.SOLUSTAN.COM
WWW.LINKMOTION.COM

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of lcdpublishing
Sent: Friday, June 03, 2005 10:22 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: Z axis stepper motor getting lazy....

Hi Dhiren,

Thanks for the suggestion but I am using a Chopper driver, no
ballast resistor. But I guess I should check the current setting to
see if that got changed somehow.

Thanks

Chris


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dhiren Shah" <dshah@s...>
wrote:

> Before you do anything else, you may want to check the current

limiting

> resistor on the step motor driver. If there is a problem, that

would be the

> cheapest thing to replace or tighten.
>
> Dhiren Shah, Dir., Operations
> Solustan, Inc.
> 165 Chestnut St., #200, Needham, MA 02492
> PH: 781-449-7666 FAX: 781-449-7759
> WWW.SOLUSTAN.COM
> WWW.LINKMOTION.COM
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]On Behalf Of lcdpublishing
> Sent: Friday, June 03, 2005 9:43 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Z axis stepper motor getting lazy....
>
> My Z axis stepper appears to have gotten lazy for some reason.

This

> stepper is an older slo-syn, 160 Oz-In stepper and is one of three
> on the same machine. The X and Y appear to be fine, but the Z axis
> has lost most of it's thrust power.
>
> As a comparison, the X & Y axis can push about 80 pounds of force
> against a scale before stalling. The Z axis can only push about 30
> pounds of force then stalls.
>
> I did disconnect the stepper mechanically to see if there is any
> binding etc. and the mechanical motion is free and smooth, the ball
> screw / nut rotates nicely etc. so it appears to be electrical.
>
> Anyone have suggestions?
>
> Could it simple be that the stepper is old and ready for the trash
> can?
>
> TIA
>
> Chris
>
>
>
>
>
>
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