how to jog dual gantry before homing
- Pieter69
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02 Aug 2025 14:18 #332670
by Pieter69
how to jog dual gantry before homing was created by Pieter69
Hi,
I am new here, just rebuild an existing router and swapped the old electronics out for a mesa 7i96s with linuxcnc 2.9.4. everything went smooth except one thing.
The old router configuration had a single home sensor for a dual gantry. So i added an extra sensor for the second driver to be able to home. The problem is that it is impossible for me to add the sensor at the exact right spot (both are on opposite side of the machine.) So i managed to get the sensors roughly at the same spot (within 1mm) Now i would want to put the gantry manually square before powering up (it is a very sturdy bridge which automatically squares out if run by hand) and then i would like to power up the machine and jog incrementally up to the sensors. with the hal watch i could see which one lights up first and i could also check how much extra jogs i have to make to light up the other sensor. this would give me the offset i need to square out the bridge with homing. Now i am forcing the gantry out of square with the error in my sensor placement
SO here my queation: Is there a way to force linuxcnc to jog both joints simultaneous before homing
I am new here, just rebuild an existing router and swapped the old electronics out for a mesa 7i96s with linuxcnc 2.9.4. everything went smooth except one thing.
The old router configuration had a single home sensor for a dual gantry. So i added an extra sensor for the second driver to be able to home. The problem is that it is impossible for me to add the sensor at the exact right spot (both are on opposite side of the machine.) So i managed to get the sensors roughly at the same spot (within 1mm) Now i would want to put the gantry manually square before powering up (it is a very sturdy bridge which automatically squares out if run by hand) and then i would like to power up the machine and jog incrementally up to the sensors. with the hal watch i could see which one lights up first and i could also check how much extra jogs i have to make to light up the other sensor. this would give me the offset i need to square out the bridge with homing. Now i am forcing the gantry out of square with the error in my sensor placement
SO here my queation: Is there a way to force linuxcnc to jog both joints simultaneous before homing
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- PCW
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02 Aug 2025 14:51 #332673
by PCW
Replied by PCW on topic how to jog dual gantry before homing
Maybe setup a test ini file with immediate homing so no
home move is done and then you should be able to jog the
gantry axis after you hit the home-all button.
linuxcnc.org/docs/html/config/ini-homing.html#_configuration
home move is done and then you should be able to jog the
gantry axis after you hit the home-all button.
linuxcnc.org/docs/html/config/ini-homing.html#_configuration
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02 Aug 2025 15:13 #332675
by Pieter69
Replied by Pieter69 on topic how to jog dual gantry before homing
the problem is i want to be able to jog the gantry before the home all, so i can find out what the physical misalignment of my sensors is. if i home first the homing will force my gantry according the sensors and so misalign my gantry and see it as homed and square
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02 Aug 2025 15:25 - 02 Aug 2025 15:26 #332676
by PCW
Replied by PCW on topic how to jog dual gantry before homing
No, if you setup immediate homing, no home move or sensors are involved,
LinuxCNC simply takes the current position as home.
LinuxCNC simply takes the current position as home.
Last edit: 02 Aug 2025 15:26 by PCW.
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02 Aug 2025 15:48 - 02 Aug 2025 16:33 #332680
by Pieter69
Replied by Pieter69 on topic how to jog dual gantry before homing
ok, thanks i check it out.
worked perfectly. 1,5mm difference. Is there a way to compensate for this directly in pncconf. the Y2 sensor is reached 1.5mm faster then Y, so Y2 should move 1.5mm further in the homing sequence?
worked perfectly. 1,5mm difference. Is there a way to compensate for this directly in pncconf. the Y2 sensor is reached 1.5mm faster then Y, so Y2 should move 1.5mm further in the homing sequence?
Last edit: 02 Aug 2025 16:33 by Pieter69.
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