Hi
I'm creating CNC drawing maxhine. I'm using arduino uno, arduino CNC shield, A4988 motor drivers, nema 17 stepper motor, sg90 servo motor.
My x-axis motor misses steps(like if motor need to rotate 30 steps It will miss steps and rotate around 15 steps) when both motor operated at once. But if I operat x-axis motor separate it works fine. I try changing arduino uno, CNC shield, motor drivers but problems is not solved.
And if I change motor connections to y-axis driver in CNC shield it works fine. I think when both motor are operated at once then the motor which connected to x-axis driver in CNC shield it Misses steps.
Did you properly adjust the coil current limits on your stepper drivers?
Are you sure that the stepper coils are wired to the drivers in the right order? Did you confirm the stepper wiring with a DMM?
What are the specs for the motor power supply? Volts? Amps?
Post data sheets for the motors.
Can you post a schematic of how you have it wired, not a frizzy picture. Also links showing technical information on each of the hardware items would help.
But you haven't mentioned the stepper drivers or the power supply.... Every detail can be important in electronics.
0.88A for a 1.5A motor is going to make it a lot weaker.
Well I use 17 volt power supply
Driver type A4988
And my y-axis motor hase 0.88A and it works just fine this problem is in x-axis
And this problem only happens in motor connected in x-axis (if I connect same motor to y-axis it works fine)
If the motor is 1.5A rated perhaps try 1.5A? You may simply be short of torque.
You are using speed ramping I hope - steppers of this size cannot accelerate instantly.
Current can be set by screw on a4988 right?
1.5A is too much for an A4988 unless it has a heat sink installed and there is forced air cooling. The DRV8825 driver can do 1.5A without a heat sink.
Yes, by the potentiometer. There are instructions on the Pololu A4988 page. Be aware that you must know the value of the sense resistors on YOUR driver modules to enter into the formula to calculate Vref. Different makers use different values.
The instructions to set the DRV8825 coil current limit is on the page that I linked.
But, can it supply the 3 + Amp current for the 2 motors?
Yes I tryed 1.5 A and problem is still same
Yes my power supply hase capacity of 5A
From this link you will find project details program etc
And I have used 1/8 micro stepper for motors
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.