- Sat Feb 13, 2021 10:53 pm
#12371
What you have described is a speed reducer. It slows the machine down and multiplies torque. This is commonly used by leather workers on machines like the 111W155.
If you have a server motor it will work just fine with a speed reducer, but it is highly unlikely that a NPS will work very well.
The controller will be able to run the motor and do all it is supposed to do, other than reliably run a NPS.
If what you want is a speed reducer and a NPS, meh, not so much do they play well together.
Machines are normally set up so that the machine runs at 75% of the motor speed. When the motor is turning 2000RPM, the machine is making 1500 stitches per minute. With a NPS, the controller will have to wait no more than 1.33 motor revolutions to see a NPS signal from the machine. A soon as it sees the signal it stops the motor and the needle rests in the position you've set it to stop at.
Controllers are set up to stop the motor if the NPS doesn't send a signal within just a couple of motor revolutions. This allows for the installation of a smaller than normal pulley on the motor. The reason the controller is designed to stop the motor if it doesn't receive a timely signal from the NPS is so that the machine doesn't run away in the case of an NPS failure. Now, with a speed reducer, the motor may turn over 3, 4 or more times to turn the machine once. Sometimes the controller will only have to wait for less than a revolution of the motor to get a signal from the NPS on the machine and the needle positioner will work normally. At other times it may have to wait for three or more revolutions, which it will interpret as a failure to acquire a signal from the NPS. It will stop the motor to prevent a runaway condition, but the needle won't be positioned. If you were trying to stop at a turning point you'll have to take a stitch that you may not want to make to sink the needle for a pivot.
It's all rather in-the-weeds sort of stuff, but there you have it.
"Sting like a butterfly..."