WorkBee CNC Appendix C 65
9.1 Common Trouble Shooting Questions
The problems and answers below are the most common issues that we have received in
our experience. If you are having an issue, before contacting us, we recommend reading
through this beforehand.
Problem - LED Volt Meter is not displaying anything.
Check it is wired correctly - if it is wired correctly please email us asking for a replace-
ment and one will be sent out right away.
Problem - Motors are not moving when issuing a jog command.
Check $4 = 1.
Problem - A motor is juddering, but not turning.
This is mostly due to either the motor being wired in an incorrect color order, or there is
a loose wire connection.
Problem - When issuing a Y-Axis jog command, it just vibrates but doesn’t
move.
This is a common error on a belt drive machine, as the motors have to be turning in
opposite directions. Go back through section 6.1, and specifically look at the top right of
the image regarding belt drive wiring.
Problem - Soft limit errors every time when running a file.
Check $130, $131, & $132 are set to the correct value for your size machine. Make sure
the CAM program is setup in millimeters. Make sure that work zero is set in a position
which allows for enough travel on each axis to complete the job. Most CAM programs
have a safe Z Height setting, so make sure there is also enough positive Z travel from
work zero to accommodate this.
Problem - When cutting, circles are not circle.
This is most likely because either a coupler or pulley is slipping on the motor shaft. Check
screws are tight, and one of them is on the flat portion of the motor shaft.
Problem - Machine goes randomly off course mid job or machine stops.
Electrical interference is a common cause of this problem. Make sure the USB & router
cable are outside the drag chains, and sleep/low power mode is turned off on the com-
puter. Carry out a long dummy run with a pen (i.e no router and no dust extraction) and
see if the problem persists. If it still persists, try another computer.
Problem - Machine was working correctly, now suddenly behaving strangely.
Sometimes the $$ settings can change value, this usually happens if the machine is
moved around by hand. Re-check all $$ values to make sure they are set correctly.
Problem - Can’t connect to CNC xPro/GRBL is not loading.
First try another USB Cable. Then try another computer. The last thing to try is resetting
the firmware on the controller. To do this download the Arduino IDE: https://www.ardu-
ino.cc/en/Main/Software
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