Override limits

Nico2017
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6 years 7 months ago #159053 by Nico2017

Override limits was created by Nico2017

Hi all,

is there a command equivalent to

Code:

self.c.override_limits()

but to disable the override limits.
When jogging away from a hard limit switch not being homed, the override get disable automaticly as soon as I move away. However when the machine is homed, I cannot disable the override if it has been enabled with self.c.override_limits().

Thank you,

Nicolas

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bbsr_5a
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6 years 7 months ago #159077 by bbsr_5a

Replied by bbsr_5a on topic Override limits

overriding the limits or setting this off is by far the WORST Case as it then can travel to the Hard limits and that kills the Liniaraxis tread ballscrew
or damage the machine at all
what are you trying to do as you want no Homing
10 Cherry switches is 5USD that gives you 3Per axis REF/MIN/MAX

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andypugh
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6 years 7 months ago #159265 by andypugh

Replied by andypugh on topic Override limits

Nico2017 wrote: to disable the override limits.

There is a hint here that calling the function again will re-enable the limits
github.com/LinuxCNC/linuxcnc/blob/263115.../code-notes.txt#L521

But I have a feeling that actually you need to pass a negative number to un-override
github.com/LinuxCNC/linuxcnc/blob/345688...ask/taskintf.cc#L701

This is the code that is run when you use the Python function:
github.com/LinuxCNC/linuxcnc/blob/ee816b...s/emcmodule.cc#L1068

And I don't see a way to pass a negative number from that.

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cmorley
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6 years 7 months ago #159280 by cmorley

Replied by cmorley on topic Override limits

In Qtvcp I looked up it's convenience function:

Code:

    # if called while on hard limit will set the flag and allow machine on
    # if called with flag set and now off hard limits - resets the flag
    def TOGGLE_LIMITS_OVERRIDE(self):
        if STATUS.is_limits_override_set() and STATUS.is_hard_limits_tripped():
            STATUS.emit('error',linuxcnc.OPERATOR_ERROR,'''Can Not Reset Limits Override - Still On Hard Limits''')
        elif not STATUS.is_limits_override_set() and STATUS.is_hard_limits_tripped():
            STATUS.emit('error',linuxcnc.OPERATOR_ERROR,'Hard Limits Are Overridden!')
            self.cmd.override_limits()
        else:
            STATUS.emit('error',linuxcnc.OPERATOR_TEXT,'Hard Limits Are Reset To Active!')
            self.cmd.override_limits()

Chris

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