Re: Servomotors & Minimill - do these need speed reduction or not?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Simon Arthur <chroma@m...>
wrote:

> Fred Smith wrote:
>
> >1)Globe motor 24VDC 1.5"D 2.25 L. Shaft has a ML style timing
> >pulley. Has a HEDS 5505 A encoder which should mean that it is a
> >HP/Agilent encoder 500 CPR two channels and draw 35MA. $25
> >
>
> Note that it has no stats for torque, and
> http://www.seanet.com/~dmauch/Products2.htm says that it's probably

only

> good for the encoders.

I bought some from Dan and they are big enough to run a micro PCB
driller like Dave was talking about with his cheapy stepper system
pricing:

"Who cares about rapids on a 12 x 12 pcb drilling machine ? or a 24 x
36 foam cutter ? Knee mills are only a small part of the CNC world."

Dave didn't know of any servo systems that were close to the $200
cost, so I showed him what he had missed to get close in a servo.
Rapids become important in drilling as 95% of the motion is at rapid
speed. These are not a direct drive solution, but scrounging a good
reduction drive setup can be as much fun as scrounging the
electronics and motors. It just depends on what part of the CNC
hobby you want to play. Electronics, mechanisms, software, or parts.

These particular motors look a lot like a short stack IM-15.

http://www.globe-motors.com/15_in.pdf

CNC covers a wide range of machines and these motors are NOT what you
would use on a Bridgeport. ;-)

Fred Smith - IMService
http://www.cadcamcadcam.com/hobby