This might sound stupid - but why can't you run both motors from the same driver - given that the drivers can output sufficient current. It is only like me wiring my eight wire motors in series or parrallel.

In that way, both motors get exactly the same pulses.

If one of the motors is consistently missing steps, that is a mechanical problem - not an electronic one, and should be treated as such, Don't try and impose an electronic answer on a mechanical problem.

This might sound stupid - but why can't you run both motors from the same driver .........

Mariss from Gecko has said that you can. BUT. only up to about 200-300rpm. Above that you run into problems, but I don't recall exactly why.

 

Friend!
Please advise the servomotors, which can good work with the Mach, and have step and dir pins.

Thanks!
Inna

It is the servo drive that needs to accept Step/Dir rather than the motor, there are many drives that do that but you will have to be more specific about your needs before anyone can advise what you need. As an example I need large servos for my machine and I have used Allen Bradley and Giddings and Lewis AC servos and drives. If you dont require such large motors then you can look at the Geckos, Rutex, Granite Devices, Tek10's, Vipers etc.
Hood

Thank you Hood!

Company which I work in, makes cnc-machine recently, and we yet pick up the best variants for our machines. (I mean inexpensive and reliable decisions).
We used for it different steppers, one time for plasma CNC we used Lense gear-servomotors, it is work good, but this is expansive way. I search good alternative, cost like steppers and reliable like Lense.
Usual we need shaft speed ~ 300-600 rpm, still torque ~12N/m, and motor weight - than less, than better.

Thanks.   

Afraid to say Cheap servos and 12Nm continuous torque are not words that you can put together. That is industrial servo territory and that is why I have Industrial servos/drives because I need that class of motor.
 Some of the Chinese guys are bringing out motors and drives of that size but how good/bad they are I have no idea.

Hood

I was not correctly expressed possibly! When I talked price as Steppers, I exaggerated. Such effort needs us on the billow of reducing gear.
My director ordered to me, to choose servomotors, purchase a few motors and drivers which I'll advise, on ebay, for an experiment. As I understood, after good result, he plans to buy already at the distributors.

Thanks.

very nice servo motors http://www.ms-motor.com/acservo.htm


and some prices of them- made in China.

---AC SERVO MOTOR
-57 Series Low Inertia AC Servo Motor
30W,price is 440USD/SET,include motor ,driver,cables

50W,price is 440USD/SET,include motor ,driver,cables

100W ,price is 440USD/SET,include motor ,driver,cables
-60 Series Low Inertia AC Servo Motor
200W,,price is 430USD/SET,include motor ,driver,cables

400W,,price is 440USD/SET,include motor ,driver,cables

600W,price is 510USD/SET,include motor ,driver,cables
-80 Series Low Inertia AC Servo Motor
500W,,price is 550USD/SET,include motor ,driver,cables

750W,,price is 560USD/SET,include motor ,driver,cables

1000W,price is 600USD/SET,include motor ,driver,cables
-92 Series Low Inertia AC Servo Motor
500W,,price is 530USD/SET,include motor ,driver,cables

750W,,price is 560USD/SET,include motor ,driver,cables

1000W,,price is 620USD/SET,include motor ,driver,cables

1200W,price is 640USD/SET,include motor ,driver,cables

ms-motor.com is not good as https://www.oyostepper.com.
I have diy 2 cnc projcets, all my nema 17 stepper motor from this site.