Re: Bridgeport! (a BIGGER brother!)

Hi Tom,

The Boss w/ AC synchronous motors would be quite different then the 4
phase unipolar stepper drive. If they can be wired bipolar stepper,
then Dan's driver boards would fill the bill. The Bridgeport project is
now a year or so off, so I have no immediate need. I will keep "reading
the mail", so that I am familiar with the hardware when the time comes.
The HEDS and HCTL finds are useful as well. I did get .ASM source to
the telescope PIC, reads encoders, sends to PC. I might derive
something from that for LCD's.

Thanks for your reply.

Alan KM6VV

Tom Eldredge wrote:

>
> 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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