Sanitycheck my plan: ethercat + stepperonline A6

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6 months 2 weeks ago #345635 by rodw
 
 re homing, read the homing configuration chapter in the docs.  linuxcnc.org/docs/stable/html/config/ini-homing.html
In fact read it about 3-5 times so it sinks in as its not a light read! Both sides need a home switch that remains triggered to the end of travel. When HOME_SEQUENCEs are set up correctly, the first side to hit a home switch stops and waits for the other one to catch up then homing continues in unison. Setting  HOME_OFFSETs allows you to square the  gantry on the final move with no need to physically adjust home switch position.
 
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6 months 2 weeks ago #345647 by andrax
I've equipped the A6 with a battery-powered encoder cable.
No homing, no problems.
However, I would also recommend the following thread:
forum.linuxcnc.org/ethercat/58103-etherc...fix?start=160#345453

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6 months 2 weeks ago #345658 by andypugh
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6 months 2 weeks ago - 6 months 2 weeks ago #345660 by fer662
I hit buy on the servos this morning! My order was at the weight limit so i couldn't even add couplings to it and i'll have to place another for the extras, but i can use the us store for that and reship as well. Regarding the cables, of which i need at least 2 longer ones than they come with the motors, i'm guessing i can't chain them and i just have to replace with the longer version, right? Also, is the one for the servo with the break completely different?
Last edit: 6 months 2 weeks ago by fer662.
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5 months 4 weeks ago - 5 months 4 weeks ago #346115 by fer662
Update:
I've got a draft electronics panel with all the ethercat stuff working with linuxCNC, including the servos which i'm able to jog around, which is a great start! it'll be a while until they are mounted physically on the machine, but i want to get started better understanding the process of tuning them, specially since i'm basically blocked from continuing with the physical part of the build until a few more things arrive.
I was able to get the stepperonline software running on a windows 10 vm within qemu and perform the inertia autotune part( which i'll obviously have to do again when they are really mounted ). I understand after that comes a manual part in which you tune the gain along with other stuff, basically testing movements and see what minimizes the error, but i've no idea about how this is done concretely, like what steps in which pieces of software, and specially how it is done for the 2 motors that share an axis.
Last edit: 5 months 4 weeks ago by fer662.

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5 months 4 weeks ago #346124 by andrax
How did you manage to connect to the drives?I’ve installed the software, but I can’t get a connection

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