Re: [CAD_CAM_EDM_DRO] 187 Volt PMDC brush servo motors - useful?

ths992001 wrote:

> The local scrap yard has a pile of vintage Cincinnati Milacron T3-786
> robots. These 7000lb monsters have dc servos that I understand were
> originally powered via SCR drives.
>
> Some of the *smaller* motors on this beast are rated at 187 volts, 8
> ft-lb stall torque at 20 amps. I lost the paper that I wrote the
> specs on so I'm going from memory.
>
> Are these motors useful for home CNC? (milldrill?, bridgeport?)

Yes, definitely. Maybe more Bridgeport than mill-drill.

> Geckos being limited to 80 volts, is there similar drive out there
> that can handle a higher voltage?

You probably don't need it, unless you want 1000+ IPM rapid feed.
With motors like this, you can direct drive, and get plenty of speed.
120 IPM with a 5 TPI screw only requires 600 RPM from the motor.
This will probably require much less than full voltage from the
motor. If they are 3000 RPM motors at 187 V, then you only
need 37 V at the armature.

Jon