Help with homing issue
24 Jul 2018 20:21 #114764
by MAG45
Help with homing issue was created by MAG45
Almost got this old beast going agan with a new PC and C10 BoB. I have X and Y homing fine, all 3 switches in series NC. But all 3 axis do this weird random stepping movement toward home rather then on smooth jog. And Z i cant seem to get to home no matter what settings I have tried. Always get the 'switch inactive before latch move' or something like that.
Here is a link to a video of the Z doing this stepping toward Z and failing to back off the switch before it errors out.
Thanks for any help
drive.google.com/open?id=17iw6w5ifycwJvoJip5REzNJ3bdpBuI27lw
drive.google.com/open?id=1mySmNIbbFdJpjZtOmIX3Q-WalYEEsXqz4Q
Here is a link to a video of the Z doing this stepping toward Z and failing to back off the switch before it errors out.
Thanks for any help
drive.google.com/open?id=17iw6w5ifycwJvoJip5REzNJ3bdpBuI27lw
drive.google.com/open?id=1mySmNIbbFdJpjZtOmIX3Q-WalYEEsXqz4Q
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24 Jul 2018 22:19 #114769
by JohnnyCNC
Replied by JohnnyCNC on topic Help with homing issue
I'm pretty new to this but these setting work for homing my Z. The setting of yours that I am wondering about is the negative value on the HOME_SEARCH_VEL. My HOME_SEARCH_VEL and HOME_LATCH_VEL are both positive values.
[AXIS_2]
TYPE = LINEAR
HOME = 0.0
FERROR = 0.5
MIN_FERROR = 0.05
MAX_VELOCITY = 1.0
MAX_ACCELERATION = 30.0
HOME_SEQUENCE=0
HOME_SEARCH_VEL = .90000
HOME_LATCH_VEL = .10000
# 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 = 1.25
STEPGEN_MAXACCEL = 37.50
P = 1000.0
I = 0.0
D = 0.0
FF0 = 0.0
FF1 = 1.0
FF2 = 0.0
BIAS = 0.0
DEADBAND = 0.0
MAX_OUTPUT = 0.0
# these are in nanoseconds
DIRSETUP = 200
DIRHOLD = 200
STEPLEN = 1000
STEPSPACE = 2000
STEP_SCALE = 13208.000
MIN_LIMIT = -14.0
MAX_LIMIT = 0.001
#HOME_OFFSET = -.9 This makes my home position above the home switch.
HOME_OFFSET = .5 This makes my home position below the home switch.
[AXIS_2]
TYPE = LINEAR
HOME = 0.0
FERROR = 0.5
MIN_FERROR = 0.05
MAX_VELOCITY = 1.0
MAX_ACCELERATION = 30.0
HOME_SEQUENCE=0
HOME_SEARCH_VEL = .90000
HOME_LATCH_VEL = .10000
# 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 = 1.25
STEPGEN_MAXACCEL = 37.50
P = 1000.0
I = 0.0
D = 0.0
FF0 = 0.0
FF1 = 1.0
FF2 = 0.0
BIAS = 0.0
DEADBAND = 0.0
MAX_OUTPUT = 0.0
# these are in nanoseconds
DIRSETUP = 200
DIRHOLD = 200
STEPLEN = 1000
STEPSPACE = 2000
STEP_SCALE = 13208.000
MIN_LIMIT = -14.0
MAX_LIMIT = 0.001
#HOME_OFFSET = -.9 This makes my home position above the home switch.
HOME_OFFSET = .5 This makes my home position below the home switch.
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24 Jul 2018 22:30 #114772
by MAG45
Replied by MAG45 on topic Help with homing issue
When i tried a positive value on search velocity it searched in the wrong direction. Found on the wiki to use a neg value.
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24 Jul 2018 22:38 #114774
by tommylight
Replied by tommylight on topic Help with homing issue
Probably you have to use home_offset at some value so it can move away from the limit switches after homing each axis. One of the switches ( on the second homed axis ) is remaining open so it can not home Z.
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24 Jul 2018 22:46 #114775
by MAG45
Replied by MAG45 on topic Help with homing issue
I have X and Y centered so completely off switches, homing Z alone. I have set the Z home offset to many different settings from .250 to -.250" and had no change in how it is acting. no mater what i have tried it clicks the switch and just barely backs off, then errors.
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24 Jul 2018 22:48 #114777
by MAG45
Replied by MAG45 on topic Help with homing issue
Just realized my video isnt working on here. gonna try to upload it to imgur.
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24 Jul 2018 22:49 #114778
by JohnnyCNC
Replied by JohnnyCNC on topic Help with homing issue
I was able to watch the video
The following user(s) said Thank You: MAG45
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24 Jul 2018 22:52 #114779
by MAG45
Replied by MAG45 on topic Help with homing issue
oh, okay, thanks
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25 Jul 2018 00:41 #114785
by MAG45
Replied by MAG45 on topic Help with homing issue
Anyone have any idea why is doesnt smoothly jog to home and does those seemingly random steps toward it like its scared to touch it?
Ill be back to messing with it in the morning, hope i have some things to try.
Ill be back to messing with it in the morning, hope i have some things to try.
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25 Jul 2018 05:09 #114792
by tommylight
Replied by tommylight on topic Help with homing issue
You have backlash compensation on so you have to set stepgen_maxaccel to twice the max_acceleration, in your case it should be 8, not 5.
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