7i92-7i76 gantry 2 moptors on X key mappings

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04 Dec 2019 12:16 - 10 Dec 2019 12:54 #151982 by bevins
The keyboard jogging is weird and not right with tandem X config.

page-up/down moves the machine in Y. and before homing......
The rest shows you cant jog before homing. I would think page-up/down would do the same but on Z instead of Y.

I don't have drivers and steppers connected, I am trying to set this up before I go onsite this weekend.

Linuxcnc 2.9 running on linuxmint 18.3


INI file:
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HALFile:

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Last edit: 10 Dec 2019 12:54 by bevins.

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04 Dec 2019 12:46 - 04 Dec 2019 12:49 #151984 by bevins
Also I am trying to home with hitting the home/limit switches. Z works fine but when I go to hit the Y the first time I hit the home switch, it goes to 0 in the display and start Y moving again, and if I hit switch again I get "joint 2 on limit switch error"
Last edit: 04 Dec 2019 12:49 by bevins.

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04 Dec 2019 13:03 #151986 by bevins
I though you weren't allowed to jog in world mode with gantry.

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04 Dec 2019 13:27 #151989 by dgarrett
======================================================
Prior to homing:
When operating in joint mode prior to homing,
keyboard jog keys are assigned in a fixed sequence:
left/right: joint0, up/down: joint1, page up/page down:
joint2, left/right bracket: joint3

Ref: linuxcnc.org/docs/2.8/html/config/ini-co...tml#_display_section
======================================================

Disallowed jogging prior to homing (joint mode):
Joint mode jogging of joints having a negative
HOME_SEQUENCE is disallowed. In common gantry
applications, such jogging can lead to misalignment
(racking). Note that conventional jogging in world
coordinates is always available once a machine is
homed.
Ref: linuxcnc.org/docs/2.8/html/config/ini-homing.html

======================================================

Workaround:
System integrators can allow joint jogging prior
to homing with hal logic that switches the
[JOINT_N]HOME_SEQUENCE items. This logic should also
assert the motion.homing-inhibit pin to ensure that
homing is not inadvertently initiated when joint
jogging is enabled.
...
An example simulation config (gantry_jjog.ini) that
demonstrates joint jogging when using negative home
sequences is located in the: configs/sim/axis/gantry/
directory.

Ref: linuxcnc.org/docs/2.8/html/config/ini-homing.html

======================================================
For using keyboard jog keys with the axis gui before
and after homing, the most consistent
coordinate_letter-to-joint_number specification is
coordinates=xyzy.
======================================================
see also:
forum.linuxcnc.org/plasma-laser/36837-ne...tion?start=70#144976
forum.linuxcnc.org/plasma-laser/36837-ne...tion?start=80#145001
The following user(s) said Thank You: bevins

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08 Dec 2019 16:40 #152334 by bevins
I have all axis running homing manually. This machine has a really rigid gantry and only has one homing switch on the dual motor axis.

Can I 'home all" and have the dual motor axis home with both motors but with only one switch? Or would I have to install a switch on the other joint? This is a bigger deal, and wont be able to do it today onsite.

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08 Dec 2019 18:35 #152336 by bevins
I'm just going to install a switch on the other joint, and that will be that.

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27 Dec 2019 22:55 #153331 by andypugh

bevins wrote: Can I 'home all" and have the dual motor axis home with both motors but with only one switch?


Yes, gantries have been working that way for years, prior to the proper support offered in 2.8+

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