Hi Mike,
I understand you do are not doing a CNC conversion. Choosing a motor to drive the head up and down is not too hard to do. However....
On my PM940M, with the geared head, the head is heavy. (I estimated it to be about 250-300#s). Yours maybe lighter. Consequentially, when I shut the power down the weight of the head tends to fall slowly until it contacts something to prevent it from going farther. Of course this means that the lead screw is turning. Having sufficent friction at the ways or elsewhere tends to prevent this. If one tightens the gib up a lot this is somewhat prevented. However, over tightening the gib results in excessive backlash. I do not like setting the Z-axis locks as I have found that they are too pointed and tend to dig into and then warps the gib.
No matter what kind of motor you put on the z-axis it needs some form of control. So why not let the motor hold the z-axis position? There are several approaches towards this. When the power is on the control system holds the position. A stepper motor with either sufficent cogging force will do this even when the power is off. To spec the motor you need to figure out the max torque caused on the lead screw via this weight if there is no other friction. So you need to know the head weight etc, lead screw diameter, and then calculate the torque . Then choose a stepper which has a cogging torque of this value. When the power is on, the stepper motor is much higher and holds the position. Also, some steppers, and DC motors, and maybe AC motors have a brake that turns on when the power goes off. I am sure there are other motors with this feature.
Anyway, it is just another thing to factor in to a decision.
That look's like it....Thank you very much...Just need to get someone to tell me what all the numbers mean..
Then I will look for a Bodine motor. Mike
So that motor just looks like an induction motor. I am not for sure what you want to know, but searching for the model number 90YYJ-120 and the manufacture DYG may tell you the specs. What is written on the rest of the label just tells you what you need to know to get the motor to run... It takes 220Volts, at 50 or 60 Hz and consumes 120 watts. It tells you the nominal rotational RPM without load and the 6uF means that it has a 6 micro-farad starting capacitor. It tells you nothing about any gears but mentions a it is geared. I assume that means that there are gears attached to the motor to slow the rotation down. But you need to look it up to understand what this gearing is. I assume the circuit diagram shows you how to wire it up and that it will run clockwise or counter clock wise based upon the switch position, but I cannot read the Asian symbols. I am assuming that the box may represent the capacitor being switched in or out of the circuit to reverse direction. If you can make them out you can feed them into google translate and may get a translation of them. Most likely you will not learn much.
Of the 90YYJ-120, I am guessing that the 120 is the wattage (again) that the 90 may have to do with the frame size. Anyway, look around at DYG motors. A little bit.
https://www.dyg-motor.com/ provides info on a lot of these sort of motors.
https://www.dyg-motor.com/?r=search...39954299904&is_parse=0&keywords=DYG+90YYJ-120 shows a motor like this, but with a right angle gear box?
