Common issues and fixes

Last Update: 18 October 2019

My machine isn’t moving in the right direction

  • Are all of the motor wires plugged in correctly and all the way?
  • Check the color pattern of each wire coming from the motor and connected to the LongBoard. Is the pattern all the same with each motor? If not, change the order of the wires to match.
The wiring color pattern should be blue, yellow, green, red.

My machine is not turning on

  • Is your power supply connected properly and providing power? There is a green LED that should be turned on when your power supply is plugged in. Check if your AC cable is pushed in all the way into the socket of the power supply.
  • Make sure that the polarity of the wiring is correct. Switch the wires around if need be.
The wire on the left should be white, and the wire on the right should be black.


My machine is not moving the right amount when I jog a certain amount

  • The microstepping on your drivers may not be set correctly. Check the drivers under your machine and make sure that they are set to 1/8″ microstepping.
  • Try restarting your g-code sender.

My motors are stalling

  • Make sure that you have not overtightened the Delrin anti-backlash nuts on your machine. Loosen the two M5-25mm screws that hold the nut in place and see if that helps.
  • Make sure that all of the motor wires are seated properly.

My cuts are not coming out accurately

  • You may have a loose component. Make sure that all of your fasteners are tight and your eccentric nuts and Delrin anti-backlash nuts are tensioned correctly.
  • Try reducing your speeds and feeds, or use a different cutting tool.

My lead screws wobble excessively

  • Loosen the two M5-25mm screws that hold the Delrin anti-backlash nuts slightly for the axis which the lead screw is on and run the machine back and forth. This will align the lead screw and the nut. Retighten the screws once the wobbling as gone away.
  • Check that the lead screw is not bent. You can check by rolling it along a surface that is very flat and seeing if it rolls evenly.

The machine moves really really slowly or not at all when I jog it

  • Check your feedrate. 1000mm/min is a good place to start.
  • Check your step size. 10mm is a good place to start.

I cannot connect to UGSPlatform or any other g-code sending software

  • Try restarting your program or computer.
  • If you are using UGSPlatform, make sure to refresh and check the dropdown box for all of the ports that have devices connected to them. Try each one until you can connect.
  • Check your computer’s drivers. Update or reinstall them if necessary.
  • Try a different USB port and USB cable.

My machine randomly stops and starts

  • Check if your power supply and all of the connectors are secure and properly attached.
  • Check for sources that may be causing electromagnetic interference (EMI). This could be vacuums, motors, and other electronics nearby that could be sending EMI to the control board.
  • Check if your drivers are excessively hot. The drivers should not exceed 80C.