Im new, am a 3D designer. Need a New cnc machine and need advice and guidance

[Robin Hewitt]

If you go with 2 motors on one axis, remember there are 2 kinds of stepper drivers. When you power up some will remember the last coil pattern used and some won't.

[Clive S]

If you go with 2 motors on one axis, remember there are 2 kinds of stepper drivers. When you power up some will remember the last coil pattern used and some won't.

Would you mind expanding on that, as I don't understand. ..Clive

[JAZZCNC]

If you go with 2 motors on one axis, remember there are 2 kinds of stepper drivers. When you power up some will remember the last coil pattern used and some won't.

Doesn't make a Jot of difference if using Home switches which you really should use with Twin motors.
It's good practice to home the machine when first switched on and Most industrial machine won't let the machine function untill the machine as been homed. This ensures your setup and square so any step jumps on startup doesn't come into play.
It's also best to home the machine between every job if not shutting down just to remove any errors that may have crept in over period of the last job. This is why I prefer single motor/belts on machines that will be running single jobs for 12hrs +.

[Robin Hewitt]

Doesn't make a Jot of difference

I can tell you have never had to write the manual

Problem with writing the manual is you have to cover all the bases, because you know some geek is going to figure out the problem and ask you why it isn't a problem. You have to try and out geek the geeks by spotting all the snags before they do. Patting a geek on the head and saying, "Don't worry about it sonny" does not work. They can smell fear.

Let's suppose your driver(s) are the forgetful step pattern kind. They always fire up on the same pattern, a pattern that will repeat every 1.8 degrees.

Now suppose you parked the machine 0.9 degrees out of phase to that so when you power up it can leap either way.

Suppose one leaps CW and the other CCW, both equally valid. The gantry is now out of square. You can bump every home switch in Christendom but the most you can do is detect the error, you can't fix it unless you can drive the motors independently.

[JAZZCNC]

Suppose one leaps CW and the other CCW, both equally valid. The gantry is now out of square. You can bump every home switch in Christendom but the most you can do is detect the error, you can't fix it unless you can drive the motors independently.

Yes agreed but you obviously have no experience of how twin axis slaving works with home switches. They do move the motors independant so I'll say it again "It doesn't make a Jot of difference if you use home switches" Your argument only works if you don't use home switches and when slaving motors you should always use home switches.
Now to clear the Geek fear manual you have, which is unfair to geeks really, i'd call them fucking idiots my self then I'll clarify by saying "Separate home switches on Slaved axis motors"