Need help with motor tuning mach 3 REX RHT34-640 Gecko 201 drive with camtronics box

[MAKESOMECHIPS]

I have a shopmaster eldorado bridgemill with REX RHT34-640 motors and Gecko 201 drives with a camtronics box for power (37.9 volts). the table moves ok but doesnt always go the right direction when changing direction using the jog feature without waiting a few seconds. and when using the circle wizard for boring a hole it comes out more egg/s shaped than round.

The direction is possessed and none of the 3 ways in the MACH3 Manual seem to fix it. While tuning, the UP ARROW Key should make the motors turn + and the DOWN ARROW Key should move the Motors -.

This is the case only 50% of the time. It is unreliable at best

A sample would be like below:

UP ARROW - Moves the motor +

DOWN ARROW - Moves the Motor -

UP ARROW - Moves the Motor +

DOWN ARROW - CONTINUES TO MOVE THE MOTOR +

They sometimes move in the direction they should, however after 3-4 movements in the correct direction, the motors WILL ALWAYS move in the WRONG direction when the opposite ARROW is pressed.

I have tried swapping a pair of wires on the motor as mach3 suggests and tried switching to the reverse setting using mach3 software have also tried one other thing suggested in mach3 but can't remember the specifics.

any thoughts would be greatly appreciated

thanks

Jamie

[ihavenofish]

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[dgapilot]

The first thing I would check is the direction outputs from the break out board. Get a multimeter and check that the direction inputs change when you make direction changes. Also check the voltage output from the computer. If less than about 3.3 volts, you may have to get a powered break out board to replace the one that came in the camtronics box. I went with a C11G and it works good.

Make sure you backlash compensation is off. I tried using backlash compensation and it gave me fits. The motors acted like they were stalling out, then starting up again.

Hope this helps.

David

[MAKESOMECHIPS]

i will try that you said "Get a multimeter and check that the direction inputs change when you make direction changes. " what should the voltage be and what will it change to when i am changing directions?

the power from the computer going to the drives is what i assume you are talking about is right at 5 volts on the nose

Thanks

Jamie