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I've decided to start building my own small (20"x20") cnc mill. I've been doing alot of research and feel I have a pretty good grasp of what is needed.
I found 3 stepper motors for $25 on ebay, but I'm not sure if they're strong enough (for wood and some plastic). There is no torque rating listed. They are older Vexta ph265m-33. 24V DC 0.21 amps per phase (2-phase). 0.9 degrees per step. I'm planning on using either 3/8" acme or 1/2" acme lead screws.
Too small. Looks like only about 50oz.
http://www.cnczone.com/forums/showpo...21&postcount=3
20" x 20" consider one of these: http://www.mpja.com/prodinfo.asp?number=17748+MS You can see the exact souble shaft version in my video here: http://pminmo.com/which-stepper-motor for the Z axis. Depending on your other axis mechanics they might also do, but you could also go to a 282 ozin stepper from Kelinginc.
I appreciate the information. I was thinking they were too small also, but they were a good price. I'm trying to do this as inexpensively as possible, without cutting too many corners. But considering I actually want to use the machine when it's done, I guess I'll have to ante up some money for decent motors.