Re: HARDINGE HNC RETROFIT

on 2002-09-28 20:44:58 UTC

Could you use linear scales for position feedback?
I think that's how Anilam does it.
Just a thought.
John Carey

--- In CAD_CAM_EDM_DRO@y..., Ray Henry <rehenry@u...> wrote:
>
> Douglas
>
> Personally, I'd toss all the GE except the transformers and a few
> components. Uptime electronics, somewhere on the west coast near LA
was
> buying GE controls for a while but my guess would be that what they
pay
> now for a 550 wouldn't get it very far down the street.
>
> The drive motors are 90 volt and the power supply to them is
probably
> closer to 100 volts. You'd have to reduce the number of secondary
> windings to get that within the Gecko's specs.
>
> They don't use encoders they use resolvers. These and the dc tachs
are
> behind a pair of large cast covers (six allen screws, probably four
> missing) on the motor ends of the axes. They are driven by a gear
and a
> flex coupling on the end of the ballscrew.
>
> Spindle speed is controlled by a pair of drive belts around an
idler with
> two variable pulleys. This idler is dragged up and down by a
little dc
> motor that turns a threaded rod.
>
> If you use Gecko 340's you could throw (ebay?) out the whole
feedback
> package and install an encoder where the drive end of the ball nut
sticks
> out. The spindle resolver is a different matter entirely as it
runs from
> a belt and is housed in a small recess below the collet closer. It
will
> take some work and some cash to find the right encoder for
that.
>
> There is no room on the x to add any feedback to the motor and
there is a
> belt reduction to the ballscrew so I'd get rather high count
encoders for
> it. The ballscrews are 0.20 pitch.
>
> HTH
>
> Ray
>
>
> On Tuesday 17 September 2002 06:14 pm, you wrote:
> > Message: 20
> > Â Â Date: Tue, 17 Sep 2002 22:01:21 -0000
> > Â Â From: "Douglas King" <evelle97530@y...>
> > Subject: HARDINGE HNC RETROFIT
> >
> > HI.I WAS WONDERING IF ANYONE WHO'S RETROFITTED AN HNC, KNOWS WHAT
TO
> > KEEP OUT OF THE GIANT CONTROLLER BOX.MINE'S A GE 550 MARK
CENTURY.I
> > PLAN TO USE THE HARDINGE AXIS MOTORS,AND HOPEFULLY THE SPINDLE
> > MOTOR.I'M TRYING TO BE LOW BUDGY,BUT I WANT A FUNCTIONAL CNC
LATHE.I
> > WAS THINKING OF GECKO DRIVES,AN AHHA CONTROLLER,AND MAYBE I'LL
HAVE
> > TO RUN NEW ENCODERS..I WANT TO GET RID OF THE BIG GE,AND I WAS
HOPING
> > TO SELL IT INTACT TO SOMEONE WHO NEEDS ONE.THANKS,DOUG KING,OWNER
> > METALHEART MACHINE

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