Need help for better configuration Setting

Hi

I work now since about two years with my cnc machine. The stepper configuration works just fine but all the numbers for Microstepping and so on I used are more or less set by trial and error method. Now I begann to engrave some huge parts and I saw that the engraved lines are not as the should be. They are a little angularly and not always straight as the should.

The problem should be on the rotational axis.

I use a nema32 Stepper motor from longs motors with 1,8° per stepp -> 200 steps per revolution
On the motor i have a belt gear with a ratio of 5:1
On my driver longs DM860A i have choosen 12800 Pulses/rev.

What type of setting should i use that the machine works just fine?

I have tried this one (red letters). But did not work as it should.




For some help I would be grateful.

Kind regards

Sergio

Driver Microstepping is not steps per revolution but Microsteps per full step
So if you have a 200 step per revolution motor and 12800 steps per revolution
this means your Drivers Microstep setting is 64

Ok thank you for this Information.
So I need to use:

200 Motor steps per rev.
64 Driver Micro Stepping
5:1 Pulley teeth (five turns of my stepper is one turn on my A Axis)
72° per rev (5:1 gear)

The problem is that this configuration did not work. There is something wrong with the scale.

My Setup is:

DM860A stepper driver set to 12800 steps/rev
Nema 34 Stepper Motor
Step Angle: 1.8 degree
Current: 4A
Rated Voltage: 3.2V
Resistance: 0.8 Ohm/phase
Inductance: 3.5 mH/phase
Holding torque: 1100 oz-in (7N.m)

If someone can help me I would be greatful.

Kind regards

Sergio

I think for a rotary axis the scale should be in steps/degree.
So if you have 200step motor X 64 microstepping X 5:1 / 360deg. should be = 177.7778 steps/degree
In Stepconfig your entries would be like this.

I think you will have to change the 1/360 to the decimal equivalent for your actual entry.

why do you need to run such high microstepping resolution?

from my experiance, anything greater than 10uSteps is a waste as it does not bring accuracy and your torque figure drops off drastically (but I guess it depends what you are machining and what your machine setup accuracy is like + drive mechanism accuracy) [you mention "huge" parts + those drives are not exactly top of the range)

www.geckodrive.com/support/step-motor-ba...-and-resolution.html

www.micromo.com/technical-library/steppe...-myths-and-realities

I think modern stepper drivers are smarter today than previous generations. I know Gecko maintains that 10:1 is as far as you should go but I've not observed any loss in torque at higher step rates. I have wondered if the drivers I have alter the step rate from the controller to the drive based on velocities etc to maximise torque.