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Backlash not working

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11 Mar 2020 06:29 #159749 by NKeller
Backlash not working was created by NKeller
HI Guys

Im very new to linux CNC i just converted one of my milling machines with steppers and linux CNC :)

but i'm having a problem the backlash its not working.
I can see the correction value in the HAL meter but the stepper motor is not responding to the backlash

I have attached the HAL and INI files

Thank you

Nick
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11 Mar 2020 07:21 - 11 Mar 2020 07:26 #159750 by BeagleBrainz
Replied by BeagleBrainz on topic Backlash not working
Maybe this [AXIS_1]
TYPE = LINEAR
HOME = -0.0
FERROR = 10.0
MIN_FERROR = 1.0
MAX_VELOCITY = 50
MAX_ACCELERATION = 70
# The values below should be 25% larger than MAX_VELOCITY and MAX_ACCELERATION
# If using BACKLASH compensation STEPGEN_MAXACCEL should be 100% larger.
STEPGEN_MAXVEL = 70
STEPGEN_MAXACCEL = 110

The docs say 1.5 to 2.0 times.

But there is a good chance I've not it right
Last edit: 11 Mar 2020 07:26 by BeagleBrainz.

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11 Mar 2020 07:24 #159752 by NKeller
Replied by NKeller on topic Backlash not working
i have tried making it larger up too 240

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11 Mar 2020 07:27 - 11 Mar 2020 07:31 #159753 by BeagleBrainz
Replied by BeagleBrainz on topic Backlash not working
How are you checking for backlash ?

Is that right for FERROR ?
Last edit: 11 Mar 2020 07:31 by BeagleBrainz.

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11 Mar 2020 07:30 #159754 by NKeller
Replied by NKeller on topic Backlash not working
so i'm moving the machine 2mm positive and 1mm negative and its leaving a difference

it seems like the stepper is not moving at all to compensate for the backlash

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11 Mar 2020 07:35 #159755 by NKeller
Replied by NKeller on topic Backlash not working
im not sure what you mean by
Is that right for FERROR ?

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11 Mar 2020 07:35 #159756 by BeagleBrainz
Replied by BeagleBrainz on topic Backlash not working
Before you are moving positive 2mm have you moved forward before that to take up any existing backlash in the positive direction ?

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11 Mar 2020 07:37 #159757 by NKeller
Replied by NKeller on topic Backlash not working
yes i have :)
The following user(s) said Thank You: BeagleBrainz

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11 Mar 2020 07:41 #159758 by BeagleBrainz
Replied by BeagleBrainz on topic Backlash not working

im not sure what you mean by
Is that right for FERROR ?


The value ?

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11 Mar 2020 07:42 #159759 by NKeller
Replied by NKeller on topic Backlash not working
10

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