[skylanehku]

Hi, I have a homemade router with Mach 3. It was running reasonably well, however I decided to upgrade it. I replaced the Y axis lead screw with a 1/2 x10 acme lead screw, nut, bearings and stepper motor etc. I adjusted the settings in the motor tuning section for the Y and this axis runs perfectly but now I cannot get the X and Z axis to work, they will hum and sometimes jerk but nothing else. I did not touch the settings for these axis. Any ideas would be welcome.
Thanks
Terry

[neilw20]

Too much friction. It is stuck. Are the shafts free to turn with the power off, like the Y is?

[skylanehku]

Thanks for the reply neilw20, the shafts etc are free, the only thing I changed was the Y axis with a larger stepper motor and lead screw. The three axis were working fine before the update to the Y axis, if I turn the X and Z axis by hand then retry them, they will sometimes move a short distance then quit. Weird.
Terry

[neilw20]

Measure your supply voltage, then hook up the old Y stepper and measure again.
Looks like the larger motor is putting more demand on the power supply.
Just a best guess here. Could be a bad guess.
Try disconnecting power to the Y driver and see if the X and Z recover.
Measure supply voltage before and after.
Did you change settings on the Y driver? Possibly.

[skylanehku]

Thanks again neil, does the larger stepper I installed on the Y axis draw power while idle? As this is the only change I have made you might be rite on with the power. I have the hobby cnc pro board with the power supply they recommend and as I said it did run all three axis before changing the stepper on the Y.
Terry

[neilw20]

Steppers draw power whether moving or stopped.
Some drivers reduce the current to about half when stationary, and it is an option in most cases.