Recycled motors

[Drools]

Today I was given the opportunity to salvage a couple of old printers. I found the following motors and I was wondering if they would be good for a DIY CNC.
Motor #1, Type 23BB-H252-08P, 12V, .34A, 35ohm. 4 phase. 6 wires.
Motor #2, UHD13N04RH, 5ohm/ph, not much else printed on it. 4 wires.
Motor #3, STP-57D301, 1.8DEG/STEP, 3.4V, 1.9A, Shinano Kenshi. 4 wires.
Motor #4, Globe Motors, 537A250, 30.3V. This one is about the size of a dremel.

Thanks
Brent

[LeeWay]

Just guessing I would say not really. They might be good for an old printer though.
I just don't think they will be very strong. They may work for a meager pcb engraver or something though.
The other issue will be finding documentation on them and hooking each up correctly to properly sized drives and power supply.
I don't think it's worth all that effort when less than $100 will get three decent motors.

[Drools]

Actually I am trying to make a simple PCB mill. Nothing fancy, the STP-57D301 is the same size as a Nema 23. I was thinking that was the only one I could use.

[sgebhart]

I can help you with the Globe Motors part number 537A250 if you like since I am employed there as the New Business Development Engineering Section Manager.

The encoder is an HP HEDS-5505-G06. The pinout is:

Pin 1 - Gnd
Pin 2 - NC
Pin 3 - ChA
Pin 4 - Vcc (+5 VDC)
Pin 5 - ChB

The motor has a no-load speed of 3220 rpm @ 30 VDC
The motor has a no-load current draw of 0.25 amps
At 20 oz-in the motor runs at 2840 rpm and draws 1.95 amps

From his data you can draw the speed torque curve. Simply draw parallel lines to this curve with proportional supply voltage values if you want to run it at a different voltage. For instance, the no-load speed would be 1610 rpm at 15 VDC.

Rotation is CW when viewed into the shaft with the red lead positive.

Internal capacitors for brush noise suppression.

Hope this helps!

[Drools]

Thank you very much, at this point I'm not sure what I could use the motor for but it is nice to have the specifications. Along with the 5 pin header you describe there are 2 wires connecting I presume to the brushes, this would be the voltage input 0->30 as you describe. I was not expecting to recover much other than the slide that the print head was on but if I possibility can use any of the motors for a project this information really helps.
Could this motor be used to run a spindle maybe?

[sgebhart]

The two wires you refer to are the power leads to the motor, and yes they connect to the brushes.

With regard to your question about using it as a spindle motor, it depends on the load. The bearings (specifically the output shaft bearing) in this motor, will accomodate some radial thrust, but may not stand up to long term routing or heavy cutting. This bearing could be replaced possibly with one better suited for the load, since it uses standard sizes.

Good Luck!