Re: [CAD_CAM_EDM_DRO] Re: Bridgeport! (a BIGGER brother!)

Alan,

I do not know anything about the Max NC, so I don't know how to respond.
Dan Higgins recommending hooking up these big motors using a bipolar drive.
The drive was origonally designed by him for regular motors, but was just
hooked up for these three wired synchronous motors, which origonally ran on
AC with a phase shifting capacitor, which of course was not used in the
stepper configuration..
Tom Eldredge, Trustee

----- Original Message -----
From: Alan Marconett KM6VV <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, February 16, 2001 11:39 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Bridgeport! (a BIGGER brother!)


> Tom,
>
> Thanks for the comments. Would you call it a 4-phase drive, like
> MaxNC? That wouldn't be hard to do. That's the way some of my early
> stepper drivers were made. Used in Radiation Therapy treatment
> machines. Great for parts!
>
> The HEDS-5500 are a good find, I could use another HEDS-6100! I seem to
> recall an HCTL 1000, an early quadrature decoder. Two channels per
> chip? There are also the U.S. Digital decoders, about $22 ea.
>
>
> Tom Eldredge wrote:
> >
> > Newark Electronics supplies the HEDS-5500 series encoders for about
42.00
> > each. They interface perfectly with the HCTL 2020 16 bit quadrature
decoder
> > counter chips from the same source.
> >
> > <SNIP>
> >
> > Alan,
> >
> > The boss stepper drivers do not take step and direction input. They
take
> > phase inputs. That is why I made a little board to make these
conversions.
> >
> > Tom Eldredge, Trustee
> > ----- Original Message -----
> > From: Alan Marconett KM6VV <KM6VV@...>
> > To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> > Sent: Wednesday, February 14, 2001 5:18 PM
> > Subject: [CAD_CAM_EDM_DRO] Re: Bridgeport! (a BIGGER brother!)
> >
> > > Joe,
> > >
> > > Thanks for the additional information. I'll go take another look at
the
> > > Bridgeports I saw (without the wife). But I think they were saying
3-4
> > > grand. Not that that was a "final" price. Care to post a pix? High
> > > detail, something I can print out on my laser printer and take to the
> > > shop. I'm sure I saw handwheels. HUGE.
> > >
> > > The stepper motors would be perfect. And I have driver cards for
> > > unipolar motors, as well as power supply. I even think I have room in
> > > my garage, er, shop! As long as I can get riggers to move it in for
me.
> > >
> > > Alan KM6VV
> > > P.S. RANT ON! Good info!
> > >
> > > Joe Vicars wrote:
> > > >
> > > > Guys,
> > > > I think you are missing what I am talking about. A Bridgeport
> > Series 1 and 2 CNC were made by the thousands in the 80's. They
> > > > used stepper motors, open loop, 1/2 step unipolar drive. The two
> > machines are identical except for the knee and table. The series
> > > > 2 weighs about 1000-1500lbs more because of a larger envelope
(something
> > like 15 x 30 vs, 12 x 18 for the series 1) Most had a
> > > > rigid ram, but some had the regular V-ram style although these are
much
> > less rigid. Some have power drawbar, but most I have seen
> > > > have quick change Ericson 30 taper spindle.
> > > > These are not converted Bridgeports, they are dedicated CNC. No
> > handwheels, ballscrews all around and 10 times better Z than
> > > > you get in ANY retrofit of a standard bridgeport head.
> > > > All you have to do is replace the stepper drivers with new ones,
and
> > put a phase converter on the spindle motor. That's it!
> > > > You can do the break by hand and blow shop air into the speed
control
> > when you want to change speeds, or it's just as easy to hook
> > > > up the air controls.
> > > > As Tim pointed out, the motors won't run at their OEM
performance
> > level, but so what? We're talking home shop here and 30 ipm
> > > > should be plenty
> > > > Someone tell me where else you can get a full size 3 axis mill
for
> > less than 2 grand?
> > > > The ONLY disadvantage is the size. Many guys may not have
room.
> > But I tell you I have a 10' by 20' with only a 7 foot ceiling
> > > > and I would never go back to my old JET. You guys with basement
shops
> > would have real trouble with it.
> > > > I don't care where you live, if you look around you will find
one
> > dead and rusting off in the corner somewhere. If you can't
> > > > find one for less than 2 grand you're not looking hard enough.
> > > > End of rant.
>
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