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Issue Calibrating - "Pull chain tight and measure" doesn't stop pulling


#1

Hi.

I’m in my first week of trying to setup the maslow cnc. Amongst the many issues i’m having… the biggest is that I can’t measure the chain from motor to motor.

When I get to the step where i am ready to “pull chain tight and measure”… I click on the button only for the motors to pull the chain from both sides until the chain gets ripped off. The motors don’t stop… and they dont’ measure. What the fuck.

Has anyone else had this issue?

I tried to enter in the measurement manually, but when I enter “measure chain manually”, i click on the button and it says “chain measured successfully”.

Not too happy with this setup. But if anyone can help me get through this part I’d greatly appreciate it.


#2

Welcome to the Forum!
Sorry to read about your issues. To narrow this down, it needs to be taken step by step.

  • First, what GroundControl version are you using and on what operating system?
  • Second, is this your first calibration attempt or one of several?
    Errors like this i’ve seen in the past from incorrect entering of measurements and confusing ‘top-feed’ with ‘bottom-feed’. More information of your setup is required. A copy of your groundcontrol.ini from your ‘user-folder’ could also help.

Regards, Gero


#3

Hi Gero,

Thank you for the assist.

My GroundControl version is 1.25. I know there’s a 1.26 out there, but not yet for windows.

For the attempts, I’ve attempted many. I think I’ve run through the calibrated process nearly 10 times now, all failing to calibrate.

Here’s the Groundcontrol.ini data…

[Computed Settings]
distperrot = 63.5
kpposmain = 1300
kiposmain = 0
kdposmain = 34
propweightmain = 1
kpposz = 1300
kiposz = 0
kdposz = 34
propweightz = 1
kpvmain = 5
kivmain = 0
kdvmain = 0.28
kpvz = 5
kivz = 0
kdvz = 0.28
chainoversprocketcomputed = 1
fpwmcomputed = 3
kinematicstypecomputed = 2

[Maslow Settings]
bedheight = 1219.2
openfile = C:\Users\User\Desktop\Maker\Project Files\Maslow-Logo-master\Maslow-Logo-master\gcode\Maslow Logo.nc
motoroffsety = 368.2
sledwidth = 310
zaxissafeheight = 5
bufferon = 0
bedwidth = 2438.4
comport = COM3
macro1_title = Macro 1
sledheight = 139
macro2 =
macro1 =
zaxis = 1
sledcg = 79
macro2_title = Macro 2
colorscheme = Light
zdistperrot = 3.17
motorspacingx = 2937.05

[Advanced Settings]
rotationradius = 152.4
chainextendlength = 1650
kiv = 0
gearteeth = 10
spindleautomate = None
kdvz = 0.28
chainsagcorrection = 0
chainpitch = 6.35
chainlength = 3360
propweightz = 1
zencodersteps = 7560.0
maxfeedrate = 800
enablepospidvalues = 0
rightchaintolerance = 0
enablevpidvalues = 0
maxtouchprobeplungedistance = 0.0
kpvz = 5
kdposz = 34
chainoversprocket = Top
kpposz = 1300
fpwm = 490Hz
kdpos = 34
encodersteps = 8113.73
truncate = 0
homex = 0.0
homey = 0.0
kinematicstype = Triangular
kipos = 0
kdv = 0.28
kiposz = 0
digits = 4
kppos = 1300
kpv = 5
propweight = 1
positionerrorlimit = 2.0
kivz = 0
leftchaintolerance = 0

[Ground Control Settings]
zoomout = pagedown
centercanvasonresize = 0
viewscale = .45
zoomin = pageup
validextensions = .nc, .ngc, .text, .gcode

[Background Settings]
backgroundfile =
manualreg = []


#4

bedheight = 1219.2
bedwidth = 2438.4
motoroffsety = 368.2
motorspacingx = 2937.05
rotationradius = 152.4

Looks normal for me. Your slack chains are on the sides and you have the ‘ring-kit’ to mount the chains?

Did you do the ‘Test motors and encoders’ test and does that pass?
A ‘semi-connected’ plug can also cause strange behaviour.
The Arduino can also get in some ‘strange state’ where nothing else helps then to do a ‘clean start’.
Clean start: Use the ‘Wipe Eeprom’ from the ->Actions ->Advanced, close GC, unplug and replug everything and start over. Deleting or renaming the GC.ini is even cleaner, but i can’t see any fault in the one you posted.


#5

I think this is an excellent suggestion (much like all of @Gero’s suggestions) and that is where I would start.


#6

Hi all. Thank you for the help. I’ve been slammed with accounting homeowrk and haven’t had a chance to use your feedback. I appreciate you both and will give it a shot asap.

Thank you again for the help.
Chris