Re: [CAD_CAM_EDM_DRO] Re: VFD for a 15HP CNC lathe

----- Original Message -----
From: "Doug Fortune" <pentam@...>
To: <cad_cam_edm_dro@yahoogroups.com>
Sent: Sunday, October 26, 2003 5:37 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: VFD for a 15HP CNC lathe


> Marv Frankel wrote:
> >
> > Scott,
> > Are you sure you didn't forget the decimal point? 15HP is more
than
> > any lathe I've ever run, and some of them were pretty big.
> >
> > Marv Frankel
>
> My two Jones & Lamsons (cnc lathes) have 30 HP DC spindle motors.
Actually only
> have one now (had to scrap one of those this spring due to lack of space),
but
> kept the motor as a spare (about the size of a 45 gallon drum!).
>
> I was just driving it with a 5 HP DC drive while it was still in testing,
so I never
> did resolve how to drive the spindle at 30 HP. Yup, pretty big mothers.
Pretty sad
> to scrap it, but I kept the one with twin turrets (even bigger than the
first!).
>
> It was the scrapped lathe that had 5 HP X & Z servo drives (60 amp peak,
65VDC) and the
> Gecko G340 drove them just fine at 20amps & 65VDC (using my 1.5KW power
supply configured
> for 65VDC) at 50 millionths (of an inch step) on Z and 25 millions on the
X axis. And by
> god it was measurable and repeatable with a 'tenths' dial indicator! The
carriage
> weighed maybe 1500 lbs with no tools on it.....
>
> Doug Fortune
> http://www.cncKITS.com
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