CNC wise men I need your help!!

[mauribastidas]

Hi friends, I don’t know the exact criteria to decide for the size and power of the stepper motors for my machine, my project is to build a 41” x 30” x 12”, I have two options 600 oz/inch or 400 oz/inch, maybe the first option is a little exaggerated, but the axis of these motors are bigger and better. Moreover I haven´t decided how to couple the motors to the screws, I suppose that it depends on the power of the motor and the axis. In my opinion the axis of the 400 oz/inch motors is not reliable; it is too thin, am I wrong? I thank all your help.

[awilliams684]

Hi friends, I don’t know the exact criteria to decide for the size and power of the stepper motors for my machine, my project is to build a 41” x 30” x 12”, I have two options 600 oz/inch or 400 oz/inch, maybe the first option is a little exaggerated, but the axis of these motors are bigger and better. Moreover I haven´t decided how to couple the motors to the screws, I suppose that it depends on the power of the motor and the axis. In my opinion the axis of the 400 oz/inch motors is not reliable; it is too thin, am I wrong? I thank all your help.

Going with too small of a stepper can result in lost steps unless a feedback system is used (linear or rotary encoders) as far as shaft couplings check out this link -

McMaster-Carr