Problem about endstop setting for A B or C axis

[Dark-Guan]

Actully,The endstop can be setted for A b or C axis , The motor will stop when the endstop is triggered ,but when G28 is runing ,the triggered endstop of A B or C will block the hole progress, untill I release the endstop by hand.
I think that means there is no walking-back move when running G28.
I want to know how to fix it.

[hzeller]

So the code actually should move back for any axis, essentially going back until the switch is un-triggered again (but I have never tested this on a real A, B, C axis, so maybe something is off).

Maybe it is going too slow ?

What are your settings for the A/B/C axis in your configuration file, and what are endstop switch settings there ?

[bigguiness]

Also, are the endstops properly mapped?

What is the DEBUG output when you start machine-control?

From: Henner Zeller [mailto:notifications@github.com]
Sent: Wednesday, September 07, 2016 9:00 AM
To: hzeller/beagleg
Subject: Re: [hzeller/beagleg] Problem about endstop setting for A B or C axis (#20)

So the code actually should move back for any axis, essentially going back until the switch is un-triggered again (but I have never tested this on a real A, B, C axis, so maybe something is off).

Maybe it is going too slow ?

What are your settings for the A/B/C axis in your configuration file, and what are endstop switch settings there ?

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[Dark-Guan]

Sorry for apply so late.
I am not working on this problem , I think I should read all the code to solve this problem.

[hzeller]

From the code, things should be working if the switches are properly mapped as pointed out by @bigguiness
(start looking at move_to_endstop()).
My suspicion is that the homing speed for the axes might not be properly chosen for rotational axes, and should possibly be made configurable ... for which there is already a TODO:

beagleg/src/gcode-machine-control.cc

Lines 927 to 928 in 4693e81

	const float kHomingMM = 0.5; // TODO: make configurable?
	const float kBackoffMM = kHomingMM / 10.0; // TODO: make configurable?

Not sure if this is still a problem right now; since there was no activity on this issue for a while I'd lean towards closing it.