Configurate Slave Axis
Does anyone have this two drives one axis set up working on a gantry router? Which I suspect would be the most common situation. I wont have anything I could test with until I have a project that needs/forces me to put the router together. (Stored, space limitations) It had a central screw driving the gantry. But that is going away, many issues. So I am while the winter is slowing things down, I am getting up to speed on LinuxCNC. I have to remember that change too.
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Does anyone have this two drives one axis set up working on a gantry router?
I don't, but many people do.
You can experiment with how it "feels" using the supplied sample configs.
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- viesturs.lacis
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Does anyone have this two drives one axis set up working on a gantry router?
I have built/retrofitted 2 gantry machines for myself and built 3 gantry machines for my customers. What kind of advice is needed?
Basically setting up LInuxCNC for gantry machine is easy. The only difference is loading appropriate kinematics module. Gantrykins is already included, but you always can create your own module to have whatever axis <--> joint mappings you need.
For gantrykins this might be useful to take a look at:
linuxcnc.org/docs/html/man/man9/gantrykins.9.html
Using gantrykins is not that easy. There are several things to take into account for safe use of the machine:
1) pay _special_ attention to remember to switch to world mode after homing not to accidentaly jog machine in joint mode only one of the gantry joints, which, depending on machine, can cause some damage;
2) executing MDI commands by triggering HALUI pins will leave machine in joint mode after command is completed; see previous point for potential consequences; switching to world mode is always available.
I myself have done these mistakes so many times that now I check for 3 times that machine is in correct mode after any of these 2 actions - homing or mdi though halui.
I think that there was something else, but these are things that annoy me most.
Other than that gantrykins does its job nicely.
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Using gantrykins is not that easy. There are several things to take into account for safe use of the machine:
1) pay _special_ attention to remember to switch to world mode after homing not to accidentaly jog machine in joint mode only one of the gantry joints, which, depending on machine, can cause some damage;
2) executing MDI commands by triggering HALUI pins will leave machine in joint mode after command is completed; see previous point for potential consequences; switching to world mode is always available.:
This alone would put me off if it can't be solved with Linuxcnc as it is an accident waiting to happen. It has to be automatic surely ..Clive
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I just slave the two axis together in hal, I have solid stops that can be checked to make sure it has not drifted and the machine is parked against them when shutting down.
Rick G
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