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Author Topic: Direction change makes the stepper motor run ruff.  (Read 3155 times)

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Direction change makes the stepper motor run ruff.
« on: June 10, 2008, 02:35:07 PM »
I am using the Probotix stepper motor controllers, and after tuning the axis motor, it runs smooth in one direction, but when I change direction, the motor runs ruff or stalls.  What am I doing wrong.

Need help please

Inivator

Offline da21

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Re: Direction change makes the stepper motor run ruff.
« Reply #1 on: June 10, 2008, 02:55:10 PM »
as a check disconnect the steppers / servos and turn the ballscrews by hand and see if you notice any binding or they being stiff more  in one direction etc , on the face it sounds as if you have some binding on slides or screws etc  ,or try reducing the tuning a small amount from what would be optimum .


Dave

Offline Chaoticone

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Re: Direction change makes the stepper motor run ruff.
« Reply #2 on: June 10, 2008, 03:10:30 PM »
Also, might want to check your backlash settings.

Brett
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Re: Direction change makes the stepper motor run ruff.
« Reply #3 on: June 10, 2008, 04:37:17 PM »
Inivator

How are you changing direction ?

If you go from one direction straight to the other using fast jog you will get a screaming sound from the motors and you will loose position

You must let the machine come to a rest before changing.

If you are changing direction in a gcode program you may have the motor acceleration too high again you will loose position.

The bigger/heavier the table the slower the acceleration must be. Time spent here getting it right is time well spent.

HTH
Phil_H
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