CoreXY: Strange jerk on Y axis.

ikarisan

@phaedrux Yes, the flashing light is a piezo probe. The sensor is very sensitive.
And yes, I am using mesh bed compensation. I will disable the compensation and try again.

ikarisan

@phaedrux Okay, these are the result:

Disabling the mesh compensation solves the problem
Reducing the ammount of probe points solves the problem!
2a) On a 220x220 bed 11 probing points per axis results in the stuttering Y axis.
2b) If I use only 5 points per axis the movements are smooth

Phaedrux

@ikarisan said in CoreXY: Strange jerk on Y axis.:

Disabling the mesh compensation solves the problem

Then this is the problem.

@phaedrux said in CoreXY: Strange jerk on Y axis.:

You can see stuttering like that if the Z axis jerk is too low.

Can you post your config.g?

ikarisan

@phaedrux Sure.... 0_1557776986379_config.g

Phaedrux

Z20.00 E40.00

Try increasing your jerk values for Z and E. They are super low. Remember that it's in mm/min. Try at least Z60 and E1000

ikarisan

@phaedrux I got the E values from: https://zestytechnology.readthedocs.io/en/latest/nimble/tuning.html but I will try your Z values.

Phaedrux

Ah I see. In that case leavethee as it is recommended by zesty.

ikarisan

It seems that there is a problem with the movement if I configure many probing points.
On a 220x220 bed these parameters work fine and the Y axis does not stutter:

Xmin: 20, Xmax: 200, Distance: 45

But if I use

Xmin: 20, Xmax: 200, Distance: 20

the movements on Y stutters again.

Phaedrux

Can you post the images of your heightmap?

How fast are you traveling when it does this, and what did you end up changing your Z jerk to?

dc42

@ikarisan said in CoreXY: Strange jerk on Y axis.:

It seems that there is a problem with the movement if I configure many probing points.
On a 220x220 bed these parameters work fine and the Y axis does not stutter:

Xmin: 20, Xmax: 200, Distance: 45

But if I use

Xmin: 20, Xmax: 200, Distance: 20

the movements on Y stutters again.

Stuttering when bed compensation is enabled is a result of the Z jerk being set too low to permit the changes in Z speed that are demanded by changes in the height map.