Re: Will Gecko 320 will run this servo ?

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>

wrote:

> >
> >
> > anthony_annicchiarico wrote:
> >
> > >I find this used servo ! will gecko 320 run it ? which will be

its

> > >performances ?
> > >
> > >Voltage Gradient No Load : 45 Volts/1000rpm
> > >Max. terminal Voltage : 180 Volts
> > >Max. Speed : 4000 rpm
> > >Continuous Stall TorqueTENV (Heat Sink Rating) : 75 lb-in
> > >Continuous Stall Torque Blower Cooled : 140 lb-in
> > >Continuous Stall Current TENV : 20 Amps
> > >Armature Polar Moment of Inertia : 0.094 lb-in sec2
> > >Torque Constant Kt : 7.5 lb-in/Amp
> > >Voltage Constant Kv : 0.42 Volts sec rad-1
> > >Peak Stall Torque : 440 lb-in
> > >Current at Peak Torque : 130 Amps
> > >Theoretical Acceleration at Peak Torque: 4500 Rad/sec2
> > >Winding
> > >Armature Resistance Less Brushes : 0.2 Ohms
> > >Armature Inductance: 1.2 Millihenrys
> > >Mechanical Time Constant : 17 milliseconds
> > >
> > >
> > >
> > Yes, but the Gecko 320 is not a very good match to this motor.

Note

> > it has a continuous stall rating of 20 A. Without massive

cooling,

> > the Gecko drive can't deliver 20 A continuous. With a 130 A peak
> > rating, the Gecko can only deliver 15 % of the motor's maximum
> > torque (which is still substantial). One possible problem is
> > the motor's high inductance and polar moment. That might cause
> > tuning problems if the D (damping) term doesn't have enough range.
> >
> > A motor this size (23 KW input, ~25 HP) is overkill as a spindle
> motor
> > on a Ser II Bridgeport, and would be suitable as an axis motor on
> > a 200 Ton K&T bridge mill! Please don't tell me you're putting

this

> > on a Sherline!
> >
> > Jon

This is too funny Jon, Sherline?
Oh yeah and then I hit the Jog Rapid key
and now the machine table is in the other room.
Whats up with that? :-)