Y axis

[Andyshomecrafts]

With the help of a very good friend who built his own CNC
I built one, it's good it jogs up and down perfect, but as soon as I put a G code in and push start, both Y axis do there own thing.More than not the Left Y moves from home but the right one is about 2-3 seconds behind, but this twists the Gantry and it binds. I have to level everything up again
Any body help please,
I'm using Mach3 with stepper motors, I'm very new so my knowledge is limited
Getting desperate.

[Desertboy]

With the help of a very good friend who built his own CNC
I built one, it's good it jogs up and down perfect, but as soon as I put a G code in and push start, both Y axis do there own thing.More than not the Left Y moves from home but the right one is about 2-3 seconds behind, but this twists the Gantry and it binds. I have to level everything up again
Any body help please,
I'm using Mach3 with stepper motors, I'm very new so my knowledge is limited
Getting desperate.

I made these assumptions

You have 2 motors driving 2 ballscrews on 1 axis? Those motors are not moving in sync?

Are the motors driven by 1 stepper driver for both? Or are you running a stepper driver per motor (A cloned axis)?

[Clive S]

With the help of a very good friend who built his own CNC
I built one, it's good it jogs up and down perfect, but as soon as I put a G code in and push start, both Y axis do there own thing.More than not the Left Y moves from home but the right one is about 2-3 seconds behind, but this twists the Gantry and it binds. I have to level everything up again
Any body help please,
I'm using Mach3 with stepper motors, I'm very new so my knowledge is limited
Getting desperate.

Andy very nice to see you back on the forum and I hope things have improved with the difficulties you have faced.
It would help if you could put a picture up of the machine with some specs. ie motors, power supply voltage, drivers etc. I will help in any way I can.