G76 problem

andypugh wrote:

It travels at the G0 speed (MAX_VELOCITY from the INI file, in general)

Try lowering that a bit. But first try lowering the MAX_ACCELL

Also, do you have backlash compensation turned on?

 

I'll try to slow down like you said.
I don't know if I have the backlash compensation activated because I don't know how to activate it.
This is the code I'm using:

G76 P1.5 Z-10 I-0.2 J0.02 K1.3

I have corrected the backlash compensation and it was not the problem.

From the tests that I have been doing, the problem is that I lose steps in Z.

I have tried to lower the maximum speed in stepconf wizard, but whatever I put the motor moves just as fast with the G76 (very fast). with Z+ or Z- the motor moves much slower.

In the INI file the MAX_VELOCITY value is always = 36.5384615385 no matter what you put in the stepconf wizard.

The motor I use in the Z is nema 23 closed loop configured as a servo at 800 pulses per revolution. the pitch of the spindle is 2mm (I don't know if it's a good configuration). I'm hoping to mount a sfu1605 spindle.

I have attached some photos of the motor and controller. also the INI file.

if the Stepconf Wizard is not doing what you want, you should feel free to edit your INI file. The INI and HAL files are intended to be human-readable and user-edited.

andypugh wrote:

if the Stepconf Wizard is not doing what you want, you should feel free to edit your INI file. The INI and HAL files are intended to be human-readable and user-edited.

 

As you say, I have slowed down and it seems that I no longer lose steps and it makes a decent thread. but how is it possible to lose steps with a closed loop motor?

Ismacr63 wrote:

how is it possible to lose steps with a closed loop motor?

[/quote]

It certainly should notice...

Maybe your step timings (step and space) are a bit marginal but this is not noticed at low speeds (this might be linked to the step polarity not being what you think. Does the step pin connect to the top or the bottom of the drive input optocoupler? )

andypugh publicación = 259779 ID de usuario = 723

Ismacr63 publicación = 259778 ID de usuario = 33444
¿Cómo es posible perder pasos con un motor de circuito cerrado?


Sin duda debería notarlo...

Tal vez los tiempos de paso (paso y espacio) son un poco marginales, pero esto no se nota a bajas velocidades (esto podría estar relacionado con la polaridad del paso que no es lo que piensas. ¿El pin del paso se conecta al superior o inferior del optoacoplador de entrada del variador?)

Forgive me but I get a little lost with what you tell me.