Re: Servo driven router table

Dancam v26 documentation says it will produce 3240 pulses per second from a 10mHz 286 computer. version 2.7 (beta) will reportedly give higher pulse output on faster computer but no indication of how much

Regards
Bob Thomas

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
>
>
> omikse2000 wrote:
>
> >I have 90vdc pm servo rated at 6000rpm with no load.
> >I am using a US DIGITAL E2-1024 encoder and a GECKO 320 con-
> >troller . My power supply is 46 vdc. I am using Dancam runing
> >from a 486dx-66 computer. I amtrying to get at least 2000 rpm
> >with no load. The max I can get is 1233rpm. Fiddled with pulse rate
> >multiplier and pwf ,but can't improve speed. Any ideas as it really
> >moves when hooked direct to the power source?
> >
> Well, with the motor directly hooked to the 46 V power source, you'd get
> 3000 RPM.
> For 2000 RPM, you'd get 1024 pulses from the encoder (assuming this is
> really a
> 256 cycle/rev encoder) x 2000/60 = 34133 counts/second. Can your
> computer generate
> 34,133 step pulses per second? If that is really a 1024 cycle/rev
> encoder, then you'd
> need 136533 steps/second! What modulation percentage can the Gecko
> 320go to?
> Probably not 100 %. The 1233 RPM (no load) is 20.55% of rated, so it is
> equivalent
> of .2055*90 = 18.495 V on the armature. That sounds pretty bad. Maybe
> you need
> more gain in the Gecko, or more pulses/second out of the computer.
>
> Jon