new member

[routercnc]

From your introduction it sounds like you want to make a wood cutting machine and have fitted 4off Nema34 stepper but are loosing steps. Couple of things:

Nema 34 sounds a bit overkill for a wood machine - I've seen them specced for lifting the knee on a mill, but for a wood cnc machine you can lift a lot of weight with a Nema 23
Nema 34 needs lots of voltage to make them work. It is possible you are under driving them. I've seen them specced on this site to run at 70V DC minimum, with a preference for direct mains drivers.
Stepper motors can be wired in different ways (series, parallel) to change their output but only if the drivers can take the current

So without jumping to conclusions too early, I think the collective wisdom on here can help you out if you provide:

1. Stepper driver make, model, and most importantly voltage being used on each axis
2. Drive system - all-thread, trapedoizal screw, ballscrew, rack and pinion, belt, other
3. Linear motion - skate bearings, v-bearings, supported rail, linear profile rail, other

Also any photos of the machine, particularly the Z axis will be a great help.