Re: [CAD_CAM_EDM_DRO] Re: HARDINGE HNC RETROFIT

i all so have a handinge for retrofit,and has wondering if you can do
single point threading?
is there any way of using a spindle a encoder?




At 05:31 PM 9/17/2002 -0700, you wrote:

>Thanks so much,Ray! I'll try and understand this info.Does the GE 550 have
>essential items for the retro?Or are there just some nice goodies in there
>to keep around for future projects?Am I barking up the wrong tree,if I
>just want a cnc lathe ,that will thread and interpolate?Will this be cost
>prohibitive,compared to a removal of the turret and a bolt on top plate
>retro,like the Rock Solid?How is the turret itself controlled?Thanks,Doug
>PS What do you mean by there is no room on the x for feedback?Isn't the
>encoder feedback?Surely we have to have one there.Right?Have you got a
>working one of these babies?
> Ray Henry 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"
> > 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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>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects
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>http://www.metalworking.com/news_servers.html
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>OT subjects, that are not allowed on the CCED list.
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Robert Gebel
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