Hi. I have just taken delivery of a cnc router. But it was dropped on delivery. I am now getting problems on the y axis. On pressing the move button in mach3 the motor makes a noise and may or may not move the machine. If it does move it starts to go one way and then may start to move the other way. There is only one bull screw on the axis and all the limit switches have been disabled and the soft stops in mach3 are oversize for the bed at the moment. I am not sure how to start the fault finding. The gantry of the machine is very heavy and the bull screw is 30mm x 5 foot. Yet the motor is only small. I am wondering if the motor is at fault being undersize. Where to start. Thanks. Michael