Diagnosing Home Switches (My CNC will not Home Correctly)

My E3/E4  will not home correctly (diagnosing home switches) The correct direction for the stepper motors during homing is toward the home switches. The Z will move up and down twice, then the X and Y axis will move.

If your CNC does not home correctly, check to see if each if the home switches are connected correctly.   Please watch this the following video on how to do this:

First, check to see if each of the home switches is connected correctly. UGS has a checkbox for each home switch to help diagnose (circled in red in the first screenshot or green in the second screenshot).

Please note that the USB has to be plugged in and UGS has to be connected before these boxes show up. If you still do not see them, you may have to close the windows above it. The windows can be reset to the default by clicking menus window>> reset windows.

To diagnose home switches: Unplug the main power of the E3, but keep the USB plugged in and the UGS connected. Manually move the E3 so that none of the home switches are closed. In this state, none of the checkboxes should be unchecked. If you have a check mark in an axis the firmware thinks the axis home switch is being pressed.

Things to check:

• Is the home switch connected?

• Is there a broken wire on the home switch?

• Is the switch too tight and the switch’s internal parts can’t move?

If the checkboxes are all empty, then press and hold the switch red roller for an axis. A checkbox should appear in the correct axis. The home switch will need to match to the correct axis or the E3 will not home correctly. (Example if you hold the Z home switch and the Y checkbox becomes checked)

Please Note: The X-axis has 2motors and drive the gantry forward and backward. The Y-axis moves the spindle and Y carriage left and right and the Z-axis moves the spindle up and down.