Choosing motors and the machines that fit them

[Doggitter]

I would like to start a cnc lathe project and am, of course, needing advice.
I have a choice of two different motor pairs to use. One a small steppers pair, tucked away somewhere yet to be found again, and another from a Agie wire EDM that I'm guessing that are servos maybe? The steppers are around 2.5" in diameter, both the same. The servos(?) are 5-7" in diameter approx. The bigger ones do make the step/buzz feel when I spin them by hand so maybe I'm completly wrong on them being servos. I don't know that stuff.
Also, I have the complete Agie machine, although it has not been powered in better than 10 years, and I got it as a project, untested.
I'd like to have some idea which pair of motors would make the best cnc lathe, and what size of lathe would be best to go with that pair. I have a 7x10 HF now, and a 16x54 Monarch, but no power to run it at the moment. I'm fairly electronics savy, but not experienced at all in this arena.
What say ye?

[Doggitter]

I can't get any help on this??? huh

[judleroy]

First, more info is needed. Take some pics of the motors and post them. Do the motors
have any specs on them? If so whst do they say. Also post some pics of the agie machine including pics of the inside of the control cabinet. Last some pics of the lathes you have and some idea of the game plan you have so far.
Judleroy

[Doggitter]

So far I found the small ones, Vectra PH265L-01B, 6V, 0.85A. 2 phase/18 deg/step, both the same thing. Looking for data on the others...

And thank you.

Oh, and I'm wondering about using those small ones on a HF 7x10 if they're big enough and a good choice. The bigger motors I'd be buying a lathe to work with as I'm positive they aren't big enough for the Monarch 16x54.

[mattbesquare]

I was just coming in to ask this question.

Torque is the name of the game for the steppers. But for servos we should look for more? I am asking because all of the brushless dc servo motors I can find have much lower torque. I know they RPM to all hell, but will this be an issue? Also where do yo get your motors? Thanks!

[Doggitter]

OK, this on one of the bigger motors. One I can't reach yet.
sigma instruments 20-4247TD-23496 I did a search for that and came up empty so far.

Also, the control for the Agie is Agiemeric 15. I see a search for that actually found a list here on CNCZ that includes that control. http://www.cnczone.com/forums/attach...1&d=1211846991

Also this http://www.adrco.com/AGI15.htm , so at that price another route may be in order.

[judleroy]

Do the motors look like the ones in the pic i attached. If so there steppers. Do they have any other info on them. Amps, volt, etc... How many wires? Do they say 1.8 degree? Its possible you could use the drives as well from the agie.
judleroy

[judleroy]

Sorry forgot the pic.

[judleroy]

Mattbesquare, look at kelinginc.net for motors. Also servos with much higher rpm can be geared down to increase torque. There also rated for constant torque so they don't drop off with speed increase like steppers. Search the forum and you'll find many posts on both servo's and steppers with the info you need. Goog luck.
Judleroy

[Doggitter]

Very similar, label also. The wires are encased in a braided mesh so I'll have to get to an end to find that out. No other specs, not even the smaller date label lower on that pic, just the upper label.

Do servo's make the same notchy feel as you turn them that steppers do? These do. I'd guess about 5" diameter on them.

Also, my Agie is tape reader, hence my comment on the BTR for bypassing(?) it?

[judleroy]

You can sometimes use the drives and motors without the rest of the controls. It would also be good if you could use themotor power supply. This would require a breakout board that could interface with the drives. Also a pc with the program mach3 or emc. Get the pics of inside the cabinet and the motors and see how many wires and then we can go from there. There are many people here that know alot more about these things then me. The drawback is nobody can help you without the proper info. Hence you need too post the pics and try to get good closeups of the different boards.
Judleroy

[RotarySMP]

Those Vexta PH265L-01B, 6V, 0.85A would probably be able to run the 7X - just, but would likely need to be geared down 2:1 with a belt drive to provide enough cutting force, and would make for a painfully slow machine.

It would be false economy to plane around these motors. Decent low inductance Nema23 steppers aren't expensive (See keling.com)