I'm new to this, but I'm really into this, and have started collecting parts.

About the stepper motors. Is it essential they are all the sam kind and type. I mean, if they are different, may they move a different amount of lengt with the same signal? So, like 10 pulses move one steppermotor 20 degrees, while the other one moves 30degrees?

Using 2 steppers and ballscrews on the x-axis, the bottom axis, is that gonna make all more complicated, or will it just make it's movement more smooth..?

Ballscrews, just like the steppers, this ones have to be equal to each other to prevent the machined figure to lose it's proportions I guess?

Different ballscrews may have different "screw-rating", so even if they all are similar, the amount of movement on the slide may be different from supposed, if I feed the software with a pre-made "drawing". Can the software easily handle such differences my a kind of setting the drwing being 1:1 or 1:1.1 or 1:0.9 or so?

And last, while you're here. How "big" should a stepper be. I think the table will be like 50cm x 50 cm...

I hope you understand what I ask for. I feel this is very essential to know before starting the builing process.