Grizzly G0704 CNC Conversion - Exploring Closed Loop Stepper Motors - Video #9
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- Опубликовано: 20 июл 2024
- Exploring the operation of closed loop stepper motors on the bench. I compare an open loop stepper motor with a closed loop stepper motor. Step pulses are provided by an Arduino micro-controller. I also look at tuning software to adjust some of the stepper driver parameters.
0:00 - NEMA 24 and NEMA 34 Stepper Motor Overview
1:13 - Components and Setup Used (power supply, driver, Arduino, and stepper motor)
2:01 - CL57Y Stepper Motor Driver
2:55 - Comparing Closed Loop Stepper Motors to an Open Loop Stepper Motor
3:27 - Losing Steps on the Open Loop Stepper Motor (getting out of sync)
3:51 - Closed Loop Stepper Corrects Position Error
4:32 - Closed Loop Stepper Position Alarm
4:58 - USB Adapter Model Y-USB-CL and Finding the Driver
6:10 - Stepper Debugging Software ( Close Loop Stepper Drive V2.14.3 )
7:52 - Closed Loop Stepper Motor Quadrature Encoder
8:16 - Debugging / Tuning Software and Closed Loop Stepper Motor Simultaneously
9:00 - MF and DR Driver Inputs (motor free and direction)
9:56 - Deviation Alarm Threshold Set to 40
10:37 - End of Video ( NEMA 34 Operating )
Music: bensound-straight
I don’t know of another drier video that is so packed full of useful information. Thank you for making this. Reminds me of the old RUclips. You’re a legend
I had the same issue finding the driver for the chip to enavle the adapter. This helped me out a lot to do that search!
Thanks for the advice!
Regarding the position error count...
The stepper drivers are set to 400 pulses per revolution, and the encoder is a 4000 pulse per revolution type. So, the motor has not had a "missed step" until the position error is greater than 10 due to the 1 to 10 pulse ratio of the driver vs encoder.
Great video. Got you a new subscriber.
hi, you made a really usefull video. Thanks, it helped me a lot
I have same motors and mill as you. 12nm on the n34. Working on a similar 4th axis to 'practical renaissance' youtuber's setup. Seig lathe haleadstock. Subscribed.
Good explanation of each of the settings and showing how the setting changes actually work. Do you think the Z axis will stay in place with power off since the stepper can rotate freely? I’ve heard of issue with linear rails having that problem because they are so easy to slide.
Thanks.
Regarding the Z-axis dropping when power is removed from the stepper, I have not come across that issue for the G0704 in forums or RUclips. I think the inherent drag in the Z axis is what will determine whether the Z axis drops or not. One thing that occurred to me is that a de-energized stepper will cog when turned by hand. This is caused by the permanent magnets in the motor. These magnets will act as a light brake that may be enough to prevent the Z axis from dropping. This braking action is more significant on the larger NEMA 34 than on the smaller NEMA 24; which may be reason enough to use a NEMA 34 on the Z axis. What I (crudely) measured was, about double the torque was required to turn the NEMA 34 . (Very) roughly: 1.3 gf mm to turn the NEMA 34 and 0.6 to turn the NEMA 24.
I'll cross that bridge when (if) I come to it. I would certainly enjoy building a braking mechanism to stop it.
Edited to correct the crude torque calculation.
@@joat_mon I came into the comments specifically to address this exact concern. I have yet to visit your subsequent videos, however I am planning to do just that. The content and calm rational delivery of usable information is top tier for those willing to learn. Thank you.
Absolutely fantastic video, and one I am recommending to students. I have to ask, what was the holding torque (approx) for the test motors when you demonstrated losing steps? I am surprised that you could cause the larger closed loop motors to lose steps by hand!
Thanks!
About the torque, I have no idea. Certainly not very much. I reduced the motor current in software from seven amps down to one, so the motor was greatly de-rated. I reduced the amps for the sole purpose of being able to stop the motor by hand to make the video. I turned the amps back up to 7 for normal operation on the mill.
@@joat_mon That makes a lot of sense! I was thinking that perhaps you had superhuman grip to overcome the low speed torque of those motors.
Hello sir, thank you very much for sharing your videos, very well explained. Could you tell me where did you source your stepper motors? if you care to share a link , that'll be great
I bought them a while back, from Amazon. They are no longer available there.
Would you by chance have a link of the build setup you are using. A lot of folks I have seen do serial builds vs arduino. I think yours is a much more updated build.
I didn't use the Arduino for the CNC build. I only used it to play with the steppers on the bench.
The USB Plug in the driver is an RS232? How dare they... my CL57 driver have an RJ12 socket with label RS232 but never used until now.
Yea, not sure how they ended up with that arrangement. I wonder if an off-the-shelf USB to RS-232 adapter would work too. I don't have one to test it out. May or may not need a cross-over cable arrangement.