@Robin2 i am doing a robot arm using this stepper motor (Nema23 Stepper Motor 19KgCm torque with Rhino RMCS -1102, 5A Mircostepping Drive Nema23 Stepper Motor 19KgCm torque with Rhino RMCS -1102, 5A Mircostepping Drive [RMCS-1151] - ₹4,370.00 : Robokits India, Easy to use, Versatile Robotics & DIY kits) for shoulder movement . i got the motor working but when i attached an arm made of plastic pipe, the motor does not hold the top position. it does not take the load of the arm. is there any thing i have take into consider while doing this or i have buy a bigger motor.