Suggestion for behavior of G30



  • Hi,

    Under some circumstances (wrong settings I believe) my Z-probe crashes into the bed.

    I think this is because while moving down to the dive height as specified in M558 the activation of the Z-probe is ignored.

    IF that is the case I would like to see ANY activation of the Z-probe, during ANY phase of the movement, halt the motion and the reason reported.

    It's very disconcerting to watch my z-probe crashing into the bed.

    Frederick


  • administrators

    Do you really mean G30 S-1? That command starts probing from the current height, so the dive height setting is not used. Perhaps you are using G30 S-1 within a macro that moves the head first?



  • @dc42 said in Suggestion for behavior of G30 S-1:

    Do you really mean G30 S-1? That command starts probing from the current height, so the dive height setting is not used. Perhaps you are using G30 S-1 within a macro that moves the head first?

    My apologies. I should learn to not trust my memory at my age.

    I just checked the form G30 P0 X0 Y0 Z-9999.

    It started moving but did not respond to Z-probe activation while moving at the faster speed.

    Once it switched to the slower speed then it did respond.

    It is during the initial movement phase you can have a bed crash if your settings are messed up.

    I was just thinking it would be nice if the Z-probe was monitored from the start a bed crash could be avoided and a warning of some sort issued pointing out the likely problem.

    Thanks.

    Frederick


  • administrators

    It's not quite as simple as that, because the Z probe might be triggered at the start of the move, for example if you send the G30 command when the head is below the dive height (so that it moves up not down), or because the Z probe is also used ot home X and the head is at the X homing position. But something along the lines you suggest may be possible.



  • @dc42 said in Suggestion for behavior of G30 S-1:

    It's not quite as simple as that, because the Z probe might be triggered at the start of the move, for example if you send the G30 command when the head is below the dive height (so that it moves up not down), or because the Z probe is also used ot home X and the head is at the X homing position. But something along the lines you suggest may be possible.

    I was only thinking of those cases where the Z-probe was being used to probe the bed and was moving towards the bed.

    Frederick


  • administrators

    @fcwilt said in Suggestion for behavior of G30 S-1:

    I was only thinking of those cases where the Z-probe was being used to probe the bed and was moving towards the bed.

    Sure; but in general the movement to the probe point is an XYZ move.


 

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