Menu | JAQForum Ver 19.10.27 |
Forum Index : Microcontroller and PC projects : Stepper-Motors to Closed-Loop Servos
This guy has done it The same thing that I have proposed, except that he did it with off-the-shelf components. Eliminated the stepper-drivers and hooked the pulse and direction signals directly to Clearpath Servo Motors No more lost pulses, stalling, noise and greater speed potential |
||||||
Impressive, I didn't know that servos are as precise as stepper motors. CoreXY is a good choice, as the motors themselves do not have to be moved, so they can be a bit more stable.I have converted my 6 year old Ender 4 to tmc2208 stepper drivers, so the only thing that is noisy are the fans and the Z-Steps. |
||||||
Far more precise. In my case, I haven't used anything greater than a 4096-line encoder which when quadrature-decoded is 4096*4=16,384 counts/revolution and this is @6,000RPM and so I need to read 1.6M+ counts/sec. Thanks to @Volhout, the PicoMite can now easily handle this. Servos are used on all industrial CNCs and robots. One of the many benefits is the ability to torque limit. I use this when there's a possibility of a machine collision; I provide just enough torque to position the load. If someone makes a programming error and the machine collides, it's usually harmless. This "force limiting" is also what they use for "Cobots". A Cobot can work alongside a human and if they should come into contact, the servos go "soft" and can even retract. Collaborative Robot Minimizing moving mass is always a good thing but sometimes that can be at the expense of increased backlash in the required transmission. Always a trade-off |
||||||
For nema 17 i have use this Servo 42c/d some time ago and it worked perfectly ;) Makerbase MKS SERVO 42D The 3D printer board can send the pulse / direction to each drivers as usual then the closed loop from Servo 42d is not able to loose any step and you get a good precision in movement. If you want to make bigger one they exist for nema 23 motor too. |
||||||
Very cool. Added to my AE cart just out of curiosity. Too limited for my applications but perfect for the intended purpose. |
||||||