now have new problem the z axis is losing steps going down now.
have check 70vdc power supply no problem there.
checked all pulleys and belts no problem.
checked stepper drivers no problem used different axis driver.
next test will check weight against what motor can handle. will use scales to lift z axis, pull to it moves, then do the maths however that is done.
the stepper motor is a 86bygh450b-06d-15j
voltage is 3 VDC, current 5 A,4 phase, 1.8 step angle, 42 Kg.Cm of forces, how do you work out force to weight i am no good at math.
any suggestion will be tried if can.
will work out weight of z axis when i found scales.
might try a counter weight next to see if that helps.