RATTMMOTOR Nema34 12N.m Closed Loop Servo Motor Driver Controller CNC Kit | 86x86x156mm, 6A, 14mm Shaft, DC30-100V,1000-line Encoder,200KHz,400-51200 Micro-step for CNC Router Milling Engraving Machine

I used this in a fully automated durability test, at work, where it ran a 6" butterfly valve open and closed. A PLC was used to automate the test. To drive the butterfly valve, a 90deg gearbox and some shafts were used. The main reason I bought this motor was because it had a Torque vs Frequency graph, which is almost spot on. I used that graph to calculate which planetary gearbox reducer I would need, so, I could get the correct output shaft speed and torque for our test. The torque output was verified through the use of a torque transducer and a data acquisition system. The test was setup to have the motor stall out at a predetermined torque when it reached the end of the butterfly valves travel, 20.7 ft-lbs or 26.5 ft-lbs, dependent upon which portion of the durability test we were at. It was stalled over 10,000 cycles before the test completed. The motor was run like this for about a month and a half. Keep in mind that there was some downtime for maintenance and inspections throughout the test, so it's not like it ran for a month and a half straight. During this time the motor didn't receive any maintenance, just our test specimens. The test also wasn't run over the weekends either. I'm impressed it was able to take that many stalls without any issues. The motor still ran fine at the end of the test. The output shaft was still tight in the housing without any side to side motion. It didn't over heat. Overall, it's a nice cheap durable motor.

Spend extra, get closed loop! Was really easy to install! (I'm not even a professional CNC'er.) I have this motor for about 3 years now. I'm still very satisfied. speed and torq in abundance. Learn to use the switches on the stepper driver to get faster speeds

To call this stepper a "servo" is not accurate at all. While it works OK at slow speeds (true servos do not care about speed) if you attempt to move the stepper at more than 3000 PPS it will fault out even under a light load. Probably OK for a CNC mill, but NOT suitable for moderate speed motion control.

these are great, work well, and are very strong.

The register on this "NEMA34" motor is not to spec. the spec (as does the drawing in the add here) calls out 73mm, but this is only 60mm. Another thing, the encoder wire is short, but it has a connector and they include a long extension cable. Thats good. But the motor power wires are short with no connector, and you have to provide your own wire and connector. No documentation anywhere in the box. oh...and the motor is the wrong one too. The inductance of the motor listed is 3.7mH, but the one I got has 5.2mH. So the power supply I got is going to be under sized. But from Stepperonline, its a better package and you get what is described.

Recibido, muy rapida entrega por el momento todo se ve bien

I bought 3 of them to convert my Bridgeport mill to CNC. They worked great and have more than enough power. Only the micro steps need to be set to your requirements and it’s ready to run.

UPDATE: The Seller was very attentive to my plight. So I'm trying another exact setup and hoping the one I got was an anomaly. Even if I have the same problem, good customer service goes a long way. The motor was great. Now it's just an expensive useless thing. The driver faults and flashes RED and, of course, the motor doesn't move anymore. NOTHING has changed on my end. It was working this morning and now it's not. It's extremely suspect that the return window closed a couple days ago. DO NOT BUY IT!

No pude hacer funcionar el Driver