Correct me if I'm wrong but a servo is basically just a motor either DC or AC but with a closed loop feed back system that way the controller knows the motors position at all times. A stepper motor isn't quite a functional motor on its own, but because of the stepping effect you don't need a closed loop system and can guess the position of the motor by counting the steps assuming none where missed. Steppers can benefit from a feedback loop but then you might as well go with a servo. I forget exactly what stealth chop in marlin firmware does but it silences the stepper motors of printers. Im pretty sure it uses non square PWM signals.
I believe you're right. I've seen closed loop stepper drivers off the ability to run open loop, but this JMC servo has a parameter to enable 'full closed loop'. I'm assuming it's a leftover from their steppers, but it'll be interesting to test out.
Idk, personally I find the hum of a stepper to be quite endearing. Little buddy is doing his job. Not ideal in some applications, but it can serve as a good indicator of when and how a machine is moving. I'm much more offended by the 16khz scream of the servo driver.
I agree - steppers have such a range of tones they make! They're really clear about what's going on with them. I keep grabbing the servo to see if it's hot, I don't have a sense at all how hard the servo is actually working. Here's some happy steppers from an old project: ruclips.net/user/shortsfcgiUcX_KjQ
I'm curious if any of the more powerful drivers suitable for a job like this can use stuff like stealth-chop. On my 3d printer, going from the A4988(I think) to the TMC 2209 dropped the noise from 'annoying from another room' to inaudible. Both of those can't properly drive anything bigger than a NEMA17 though.
That's good to know about the TMC, I haven't tried it! With nema17s, the DRV8825 is slightly quieter than an A4988. You're spot on about the drivers - especially in precise machines like 3d printers.
So, I've bought a lot of these parts and am in the process of merging it with your other machine but thinking of using the screw nut to connect to the pneumatic sc 50 X 150 from above making the overall machine taller rather than long, do you think the 0.60Nm servo's gonna be strong enough to actuate the pneumatic without any type of gearbox?
Seems like this is worth a try and I've got plenty of spare parts .... I'll post a vid tmr :) Attached to the screw, the 180w / .6nm servo is *very* difficult to stop. If you can cycle the cylinder by hand the servo / screw won't have any issue. Micro stepping and screw lead options can provide either low end torque or higher top speeds.
I haven't thought about renting! This is the first machine I've made that should have reasonable shipping costs - I'll let you know when it's getting closer to finished :) There used to be rentals from machineyourself.com, but it looks like the site has shut down :/
I gotta show my wife this machine, maybe she'll let me build it for her!
Yo, me gusta saber cómo puedo hacer funcionar el actuador de esa forma, que sistema se le monta, saludos
@juanrf7722 In this video, I used an ESP32, using the ESP Flexistepper library. I’ll have more info on the control side soon :)
Correct me if I'm wrong but a servo is basically just a motor either DC or AC but with a closed loop feed back system that way the controller knows the motors position at all times.
A stepper motor isn't quite a functional motor on its own, but because of the stepping effect you don't need a closed loop system and can guess the position of the motor by counting the steps assuming none where missed. Steppers can benefit from a feedback loop but then you might as well go with a servo.
I forget exactly what stealth chop in marlin firmware does but it silences the stepper motors of printers. Im pretty sure it uses non square PWM signals.
I believe you're right. I've seen closed loop stepper drivers off the ability to run open loop, but this JMC servo has a parameter to enable 'full closed loop'. I'm assuming it's a leftover from their steppers, but it'll be interesting to test out.
Idk, personally I find the hum of a stepper to be quite endearing. Little buddy is doing his job. Not ideal in some applications, but it can serve as a good indicator of when and how a machine is moving.
I'm much more offended by the 16khz scream of the servo driver.
I agree - steppers have such a range of tones they make! They're really clear about what's going on with them. I keep grabbing the servo to see if it's hot, I don't have a sense at all how hard the servo is actually working. Here's some happy steppers from an old project: ruclips.net/user/shortsfcgiUcX_KjQ
I'm curious if any of the more powerful drivers suitable for a job like this can use stuff like stealth-chop. On my 3d printer, going from the A4988(I think) to the TMC 2209 dropped the noise from 'annoying from another room' to inaudible. Both of those can't properly drive anything bigger than a NEMA17 though.
That's good to know about the TMC, I haven't tried it! With nema17s, the DRV8825 is slightly quieter than an A4988. You're spot on about the drivers - especially in precise machines like 3d printers.
So, I've bought a lot of these parts and am in the process of merging it with your other machine but thinking of using the screw nut to connect to the pneumatic sc 50 X 150 from above making the overall machine taller rather than long, do you think the 0.60Nm servo's gonna be strong enough to actuate the pneumatic without any type of gearbox?
Seems like this is worth a try and I've got plenty of spare parts .... I'll post a vid tmr :) Attached to the screw, the 180w / .6nm servo is *very* difficult to stop. If you can cycle the cylinder by hand the servo / screw won't have any issue. Micro stepping and screw lead options can provide either low end torque or higher top speeds.
Seems to work well even cobbled together like this - I'm sure you'll do better than this for a setup :)
ruclips.net/video/M9aLwvZxYgc/видео.html
Where can I rent this device, only for a week-end? Thanks!
I haven't thought about renting! This is the first machine I've made that should have reasonable shipping costs - I'll let you know when it's getting closer to finished :) There used to be rentals from machineyourself.com, but it looks like the site has shut down :/
Gibt es vielleicht eine Teileliste, Bauanleitung, und wie funktioniert das mit der App ? Sehr interessantes Projekt 👍