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Configuring LinuxCNC
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Basic Configuration
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Homing A axis (I have a sensor for it)
Homing A axis (I have a sensor for it)
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15 Oct 2020 08:35 #186166
by JetForMe
I can't seem to find info on how to configure my 4th axis to support homing. I have a sensor for it, but it's not clear how to configure linuxcnc so that I can do an homing operation (the 4th axis isn't always installed), and also not trip just because the index went by the sensor.
What's the config to achieve this?
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15 Oct 2020 11:30 - 15 Oct 2020 11:48 #186184
by Aciera
I also have a detachable 4th axis. To manage homing correctly I have a hal-signal that defines whether the 4th axis is present or not. If it is present then it homes normally as setup in the ini if it is not present then I generate a homing pulse in classicladder to home the axis as soon as it starts the homing process.
Last edit: 15 Oct 2020 11:48 by
Aciera.
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15 Oct 2020 16:05 #186218
by Mike_Eitel
I can switch ON a fourth axis, normaly not plugged in. So homing is normaly set to no=0. In csse i use this axis i simply press homing-a in gmoccapy
Or you twi different projects.
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16 Oct 2020 05:32 - 16 Oct 2020 05:33 #186248
by JetForMe
To answer my own question: it seems it works as desired to simply configure homing, and to specify only a home switch input on the joint:
HOME = -1.7
HOME_SEARCH_VEL = 180
HOME_LATCH_VEL = -18
HOME_SEQUENCE = 0
HOME_USE_INDEX = 0
...
net max-limit-home-joint-4 joint.4.home-sw-in <= hm2_7i76e.0.7i76.0.0.input-15-not
As to avoiding the need to home when the axis is not present, I'll have to do something like what Aciera suggested, although I really don't want to.
Last edit: 16 Oct 2020 05:33 by
JetForMe.
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03 Mar 2021 10:54 #200883
by JetForMe
Update: I was wrong. I wish there was a way to tell LinuxCNC to ignore an axis for homing at run time (e.g. via user interface, or some signal the hardware can detect).
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03 Mar 2021 11:14 #200887
by Mike_Eitel
Or think the other way round...
This axis will never be homed automatically.. =0
Use a special button to home when you want nevertheless.
Gmoccapy can do so.
Mike
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03 Mar 2021 23:54 #200961
by andypugh
My A-axis is not in my home sequence.
And my A axis is not always fitted.
I don't actually see that much is gained by homing the A axis, as the workholding that fits it all allows the work to be mounted at any angle.
I suppose if you are in the habit of turning the machine off with part-finished work in the rotary axis then there might be some point.
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Configuring LinuxCNC
-
Basic Configuration
-
Homing A axis (I have a sensor for it)
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