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G28 w/ABL diagonal movement too fast

Posted by nonaym 
G28 w/ABL diagonal movement too fast
November 25, 2016 11:57AM
I've been struggling trying to find the bit of code inside Marlin that effects the speed of the X/Y movement from X0 Y0 to bed center when running G28. I have an ABL sensor installed and working fairly well, but the diagonal movement to the center of the bed is occurring way too fast and causes my Y-steppers to skip every time (maybe X too, but tough to tell). I have tried changing just about every part of the code that I could find that seemed like it might make a difference, but no dice! While it may not be the best illustration, I have a video of the issue here: [goo.gl]

This is more or less the copy of Marlin I am using: [bitbucket.org]

Does anybody have any definitive answers to how I might go about slowing that one movement down?

Thanks in advance!!

Edited 3 time(s). Last edit at 11/25/2016 12:04PM by nonaym.
Re: G28 w/ABL diagonal movement too fast
November 25, 2016 12:19PM
In RCBugFix:

// X and Y axis travel speed (mm/m) between probes
#define XY_PROBE_SPEED 8000

or it could be these lines:

// Homing speeds (mm/m)
#define HOMING_FEEDRATE_XY (50*60)
#define HOMING_FEEDRATE_Z (4*60)
Re: G28 w/ABL diagonal movement too fast
November 25, 2016 12:42PM
Thanks stephenrc,

I did already try adjusting the "HOMING_FEEDRATES," but these only seem to effect the initial X homing action and the Y homing action (moving X/Y both to 0). And changing the Z "HOMING_FEEDRATE" only seems to effect the Z movement after the problematic diagonal movement. The actual diagonal movement speed remains unaffected (still too fast!)... this is why I am so lost, because all the speed settings I can find are ignored by this one travel movement.

I'll have to research the RCBugFix section you mentioned, as the version of Marlin I am using does not have the "XY_PROBE_SPEED" variable. From the way it looks, this is the same as the "XY_TRAVEL_SPEED" from previous versions which only effects the movements that occur after running a G29 (i.e. ABL procedure).

Edited 3 time(s). Last edit at 11/25/2016 12:46PM by nonaym.
Re: G28 w/ABL diagonal movement too fast
May 05, 2017 07:55AM
nonaym,

did you actually find a solution to that problem?
I'm stuck exactly at the same point.

Cheers

mosci.to
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