I just got all of the parts together for my MPCNC, but my stepper motors seem to have virtually no torque. I am using these stepper motors:(https://www.ebay.com/itm/Lot-of-5-NEMA-17-Stepper-Motor-GT3-Minebea-Mill-Robot-RepRap-Makerbot-Prusa-S5/321503057192?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649) and using a RAMPS board with A4988 stepper drivers. I am using a 12V 30A power supply.(I think that’s all the details that are necessary)
Anyway, as the title says, my motors have very low torque. I can hold them in place with just my fingers when they are turning(just the motor, with no load), and can easily turn the shaft while they are powered on. My Z-axis is noticeably stronger than my X or Y axes. My Y axis is using the Z-axis slot on the RAMPS board, which has two motor connections. My X-axis is using both the original X and E0 motor connections, so it has two separate motor drivers running it. There does not seem to be any appreciable difference in torque between the two axes, so I don’t know if that is really an issue. The X-axis has a horrendous high pitched whine when I try to turn the current up as far as it can go. Does anyone have any advice for why my motors seem to have no torque?