Does this sound normal?

[dazp1976]

Oh, here we go again, I

The reason for them not being able to reach the feeds is two-fold, 1st they only have 5mm pitch ball screws, and 2nd they have Nema 34 motors with low volts.
Large motors like Nema34 when run on low voltage don't spin very fast and the torque drops away very quickly when they are at higher rpm's, they struggle to reach much above 1000rpm and have any usable torque left if run on voltages lower than 60Vdc.
Combine this with a 5mm pitch and your maximum velocity is 5000 mm/min, which in practice would actually be more like 4500mm/min

Even 60Vdc isn't enough to reliably run 34's in my view.
I know I'm talking of a mill with gibs here and routers are looser running, but still., I could not get my 1080oz reliably above 450rpm (2250mm/min).
I've bought a new driver for that particular motor (110vdc/80Vac) and upping to 80Vdc as a tester to see if there's any increase in performance. (Will be a while yet, still building new control box).
Will eventually go all AC.

With the X & Y I swapped motors to 566oz nema 24's keeping voltage 60vdc and 860 drivers the same.
It's twice as fast with those 2 on there.

It's shocking how many people get screwed over these days with misleading specs and advertising.
At least if you D.I.Y. it you can over engineer the damn things!. (you can also go too far there though).

[JAZZCNC]

Even 60Vdc isn't enough to reliably run 34's in my view.
I know I'm talking of a mill with gibs here and routers are looser running, but still., I could not get my 1080oz reliably above 450rpm (2250mm/min).
I've bought a new driver for that particular motor (110vdc/80Vac) and upping to 80Vdc as a tester to see if there's any increase in performance. (Will be a while yet, still building new control box).
Will eventually go all AC.

Yes, I agree but in this case, with small Nm NEMA 34's like fitted on this machine then 60Vdc or more should get them to close 1000rpm. It's a combo of 5mm and low rpm which cripples the speed.

Will eventually go all AC.

Don't get hung up on AC, the only advantage is you don't have to mess around building DC PSU's. Even with AC power the drives convert this to DC for the motors.