i am replacing the lead screws on my small cnc router. the old screws are 10mm-2mm, 2 lead acme screws, (0.160"/ rev±) and work okay. i am replacing with 1/2-10 acme screws and was debating whether to use single start (0.100"/rev) or 2 start (0.200"/rev) threads. my first thought was single so the it would require less torque to move the axis around the table. but then i thought the stepper motor would have to rotate twice as fast and that can cause problems as well. of course the 2 start would have the closest pitch to the original. does anyone have any thoughts about my choices.
i am also upgrading the stepper motors to higher torque as well, going to 296oz/in vs whatever those that came on my chinese router are, very weak
any thoughts or advice would be helpful. i have been unable to find whether its better with fast travel or less torque when installing lead screws on a cnc.