Dear all,
I am designing my first 5 axis CNC milling machine mainly to work aluminium. For X, Y and Z axis I have chosen Nema 23 stepper motors that provide 1.9 Nm torque and a lead screw 10x2mm. In this way I have a precision of 0.01mm and a very high linear force. Now I am looking to have a similar precision around the A and C axis considering a working volume of 200×200×200 mm, but it looks very complicate. Using the same kind of stepper and a reduction done with T5 pulleys from 10 teeth to 60 teeth, at 100mm from the centre the movement is about 0.5mm pet step. So to have an acceptable person at least I need to use x8 microsteps, but doing so the torque goes down to about 20% of the full step one and even considering the increasing factor by 6 due to the pulleys, we arrive to about 2 Nm, that is just a force of 20 N at 100mm from the centre.
I don't think it is enough for to mill aluminium. Can you give me some advice?