jogging 3 axis works strange

Hi,
I am using 3 axis home build milling machine on steppers.
It runs on standard wizard configuration.

I have strange behaviour when jogging. The thing is when I want to jog 3 axis simultaneously sometimes only two of them move at a time, and sometimes all 3 go together.

Does anyone also had this kind of behaviour?
What can cause this.

Cris.

cradek wrote:

How are you jogging and with what GUI? Can you tell us how to reproduce the problem you see, using a sim configuration?

I am using AXIS GUI.

I do not know how to reproduce problem with sim configuration. (I am not familiar with sim configuration). Bu also I cannot tell how to reproduce problem, in a stable way, with my configuration. This problem shows up randomly.

Yes this is happening when jogging with keyboard.
I use standard arrows and PgUp, PgDN keys. If I use combination of three not always all three axis move in the same time. But always at least two are moving. If this happens there is no difference if I press all the keys simultaneously or one by one. I believe only vertical (joint 2) axis is being switched off.
So if for example I jog X and Z in the same time and press arrow key to jog Y in the same time, Z stops moving. (But this is not happening always).
I am peaty sure that right after switching on and homing all 3 axis are moving together, and that this problem shows up after I run a program.

Cris.

Is it that the Z axis is stalling (motor stops but DRO keeps moving) or is it as if you stopped pressing the Z jog button? (I must say I've never tried to jog 3 axis simultaneously.)

Hi,
I did some observations and it seems than situation is as follows:
1) When Z axis stops also it stops in EMC, so behaviour is consistent with what EMC expects machine to do
2) Previously I thought that this behaviour was random but it appears it is not the case. Z axis is stopped for only one combination of X Y moving directions. So if I go X+ Y+ I cannot move Z in the same time. If I relics any of X or Y jogging key Z starts to move. It stoops expediently if I hold this combination of arrows.

Cris.