need stepper mill advice

[mike10]

i have a 600 pound mill drill like a rong-fu (craftex 2hp)
im using delarange board
powered by two 12v power supply's (Pc-computer power supply)
i have two vextra 6 wire 2volt 6 amp 660oz motors (x-y)
and one vextra 6wire 6volt 2amp 560oz motor (z)
direct drive .100 per rev screw

complaint- i cant only get 6 in/per minute reliably, maybe 12 not realiably

I want 50 in/per minut reliably

question

whats the best way to get my speed
start over and go servo?
gecko's and bigerer power suply? like 36volt?
are my motors to small?

i dont want to buy getckos and do all the work to be disapointed!
but it would be alot easyer than starting over with servo motors

how do i test to see how much hold torque in getting to make sure im getting my full 660 oz? can i use a torque wrench? if so whats 660 oz in inch pounds?

[ger21]

I can't tell you if the motors are big enough for your application, but I can tell you you'll get much better performance with Geckos and a 36-48V power supply. The 6V stepper should probably have at least a 60V supply. You shouldn't need servos to get what you're looking for.

660oz in = 3.4 lbs-ft or ~41 lbs-in