New build – input/comments appreciated

[hanermo2]

Excellent start !

One point.
A tiny nema 23 stepper, on my machine, moves my bed mill, effortlessly.
The bed is 1600 mm wide, 60 mm thick on ribs, tool steel.
Mass is 200 kg, with upto 200 kg of stuff on it.

The "right" way to do it is drive the moving bit at 1:3 with the stepper with HTD belts.

This provides better overhead, much better acceleration, better accuracy, and about the same speeds.

If nema 23 steppers dont work, get ac brushless servos, at 130€ each, or 290€ for servo motor, driver, cables, encoder, everything.
They cost == the same as 34 size steppers, and
-5x more accurate
-5x better acceleration (more than you need)
-3-5x top speed (too much. You wont want all the speed).

The top speed is not important,
the cutting speed is very important,
accuracy is vital,
and rigidity is everything.

Just my experience.
Modern brushless servo motors are
-not noisy, (IMPORTANT),
-dont backdrive and activate with back-emf (VERY IMPORTANT),
-wont take off if the cables get cut or disconnected,
-have anti-jitter circuits,
-can be used with differential connections (less sensitive to noise)
-have a disable-input on them.

Best,
hanermo

Building cnc stuff since 2002, mostly full-time.