Hey Thomas,
looks like you loose steps on this axis.
Onefinity provides a help file which deals with many kinds of erratic movements of an axis:
I would check all points one by one to see why your carriage seems to loose steps.
There are three causes that are not mentioned in the document above:
-
Should your machine not be properly rectangular (“squared”), the Y movement can block.
Have you ensured accurately that your machine is rectangular (“squared”) (bar gauge) and coplanar (“not twisted”) (fishing line method)?
-
And the second possible cause not mentioned in the document above is: This mysterious issue some time ago.
-
Electromagnetic interference (EMI), as e.g. mentioned here.
The issues you have with Onefinity machines, both buildbotics-derived Original Series and Masso-G3-powered Elite Series, are usually not issues with the controller but
-
Lack of a serious cabling solution
1a. Connectors that are made for internal electronics are used on the outside of the machine/controller and subject to permanent movement (possible failures with unpredictalbe axes movements)
1b. Total lack of stepper cabling shielding, so overall susceptibility to EMI, especially when upgrading to a spindle (VFD = heavy source of EMI, but also the Makita hand trim router’s carbon-brush commutators emit a lot of EMI due to the usual sparks)
-