I am replacing the old Vexta nema23's on my setup with real steppers finally. My controllers are:

KL-6050 Microstepping Driver

5.0 A peak
Resolutions: 1/2, 1/8


KL-350-48 48V/7.3A Power Supply

What motors from Keling are the best match for that setup?

Sofar I think:

KL23H276-30-8B are 282ozin with a nice linear torque curve
KL23H284-35-4B 387ozin kick the crap out of the 425ozin ones above it

I plan on using the KL-6050's for my lathe conversion (some day)
The new (in production) KL23H2100-50-4B 570 oz/in motors will work great with them, 5 amps and 50 volts.
The 282 you mentioned looks the best of in stock.
Of course they can be used with it, you just miss out on some of the potential of the 6050.
The perfect motor would be 5 amps and 60 volts (3.6 mH) so you could use a 60V PS.

Mind me asking why exactly the 282's are the best choice? besides the 25% their rated voltage puts it at my 48V supply and a linear torque curve the 387's have a very similar response but with added beefiness at slower feeds cuz who really needs full torque at rapid speed anyways?

Im an electrician and have some friends at wholesalers keeping their eyes out for cheep 120V:60V or 120V:120V dual coil isolation transformers in the 600-1000VA range but sofar Finding anything above the 24V and less than 120V in a standard transformer is hard.

I would order one from a few electrical/electronics component places but after shipping the prices get ridicules. Who knows when I get to the point where I need good power I will probably just build my own power supply, lots of mosfets out there that can handle >200V and 20A continuous with a crap load of filtering a 60V/20A system off a cheep 120V transformer is possible.

A little off topic, my Vexta 265's are bipoler 2.6A and in Mach3 they are set up as 100ppr and their very accurate even though their only 68ozin. With the 282's in bipoler stepper what should the ppr be? I notice all the rated charts are 2,000-20,000ppr but im nowhere near that...

the 282's are only .8 amps short of the 6050 and dead on with the 48v PS.
the 387 is 1.5 amps short and 15v over.
just closer to the specs of the 6050 and the 48vPS.
If you use a 60V PS then the 387 would get the nod.
all depends on what the motor has to push around.
I would use the 282 for an X2 X and Y but not for an X3.
Having the driver, PS and motors match is ideal but compromises usually have to be made.
Hoss

Thanks for all your responses over sence I joined to forums Hoss, you are one of the best.

I just finished reading a website on converting a lathe to CNC (http://www.nerdulator.net/9x20/Engineering9x20_CNC.html) and the engineering things to take into consideration and was hoping to ask some motor choice and a bearing choice questions.

It was a very good writeup but a few parts where just assumed it seems. I understand how to figure out the speeds, feeds and loading of a machine and to use that info to choose the most accurate linear hardware but right after the acme screw chart he wips out that he will need a 220oz-in motor, but where on earth did that choice of a number come from????

Then down in the bearing choices part he says "the combined equivalent loading during cutting is 4.4kN" but I only saw the original cutting force and dynamic loading of 2.4kN so where did this number come from? I know it has two axis so I would have figured to achieve the same force on all axis just double it to 4.8kN. Did he just lower the requirements a little so as to use the deep-groove bearing?

Once I fully understand the process I want to 'engineer' a few conversions and source parts and do some machine capability/conversion cost comparisons on my website as I am buying a house this year or next and want to plan for the future shop.

Thanks!