Gantry

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07 Jun 2024 02:49 #302503 by rajsekhar
Gantry was created by rajsekhar
I am in middle of a XYYZABC machine. It may require another C after trial run is made. Board=7i92+7i76+7i78+7i84

I have physically connected Y (joint 1) to stepgen1 of 7i76 and Y(joint 4) to stepgen4 of 7i76.

With PNC config, XYZA configuration is made. HAL and INI attached.

As per my understanding of GANTRY component, Y motion command to be attached to stepgen1 and stepgen4 and both joint will perform similarly except when homing and there will be no joint mode (only world mode) in Gmoccapy. Am I right?

And in actual, I got confused. Which pin to be connected to whom, motion and limit and home?
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07 Jun 2024 03:11 #302504 by tommylight
Replied by tommylight on topic Gantry
No.
Use PncConf, create a new config, set the Y axis for stepgen 1, then set stepgen 4 as Axis>Tandem Axis>Y2 Tandem Stepgen

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07 Jun 2024 08:00 #302516 by rajsekhar
Replied by rajsekhar on topic Gantry
ok.

But then what is the use of gantry component, request for explanation for my understanding at least.

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07 Jun 2024 08:18 - 07 Jun 2024 08:18 #302518 by Aciera
Replied by Aciera on topic Gantry
Not positive but I think 'gantry.comp' is an outdated solution (2014) to drive multiple joints which was necessary before joints/axes were separated in Linuxcnc Version 2.8+.
Last edit: 07 Jun 2024 08:18 by Aciera.
The following user(s) said Thank You: tommylight

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08 Jun 2024 09:39 #302617 by andypugh
Replied by andypugh on topic Gantry
Indeed, the gantry.comp should not be used on new configurations, the correct behaviour is now built-in to LinuxCNC.

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