IanC

Thanks for your reply smiffy, im 100% the belts are not slipping.

I was wondering if one or both of the stepper motors could be faulty. Seem to be quite pricey so I was hoping to be certain since I dont have a working mac to try swapping the motors.

I'm erring on the side of the belt being loose. Whip the sides off and see whether the belts can be made any tighter.

 

HTH

 

Cheers

 

Smiffy

Thanks for your questions, I have added some answers if that helps any

In what way do they struggle? They can't get through the full range of motion?

With the fixture sat on its base. When they get to about 90^o the weight of the head pull against the motors

 

How fast are they moving? Really fast?

They are moving at full speed

 

Do they have to move so fast?

Yeah the problem happens when they are moving at there default speed

 

Are the belts tight?

I was under the impression the two springs set the tension to the rear of the stepper motors, then you just nip the screws up tight

 

Do the motors move freely without power or is it a bit tight?

Motors run free with power off

 

Are all the sensors clean and free from obstruction?

Encoders are free and sensors are clean no errors on display

How do they react on a slow cue? Will they always find the right position?

they keep trying till they find the right position

Do they calibrate properly?

When the fixtures are powered up they go through the start up sequence fine

 

Do they work fine initially and then after some time do they start to get iffy? Or is it straight away?

they show the fault immediatly when moving fast

 

Cheers

 

Smiffy

I have 4 martin mac 600`s which all have to same fault. When moving at slow speed the tilt works fine, but if they are tilting at full speed the stepper motors struggle.

All toothed belts are in tact and I have swapped the pan and tilt driver chips over and the problem is still they same.

Has anybody else experienced this problem? if so help would be much appreciated