Re: Teledyne Gurley DRO

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Paul Amaranth <paul@a...>
wrote:

> On Sat, May 03, 2003 at 12:05:16PM -0000, abenedro wrote:
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>

wrote:

> > >
> > >
> > > abenedro wrote:
> > >
> > > >Hi,
> > > >I have a Teledyne Gurley DRO from the 70's which will only

read in

> > > >metric although the thumbwheel switches should allow it to

read

> > > >imperial as well as metric. I suspect it may have been

configured

> > > >this way since new to prevent mistakes as it was off a Swedish
> > milling
> > > >machine used on a Sandvik production line. The readout is a
> > > >Pathfinder model 8770 and uses TTL updown counters (74192) and
> > > >minitrons for the displays.
> > > >
> > > >Anyone got a schematic for this box so I can work it out or

heard

> > of
> > > >this before?
> > > >
> > > >
>
> I have a Pathfinder-5 DRO, which I think is a later model from your
> description (it uses a microprocessor and LED displays). T/G was

very

> helpful getting a scale repaired, but they couldn't help me on a
> schematic for this box either. If the board ever goes bad, I figure
> on keeping the signal conditioner board and replacing the guts with
> either a PIC or a PC on a card system.
>
> Paul
> --
> Paul Amaranth, GCIH | Rochester MI, USA
> Aurora Group, Inc. | Security, Systems & Software
> paul@A... | Unix & Windows

Ok Paul.

Thats more or less what Jon concluded.

My box must have been one of the first! T/G say that all boxes are
compatable with the original scales so if I could find another box
that may be the answer? Had thought of using a PC based display but
the o/p from the scales is this sine wave and all the pc systems I
have found up to now use the quad square wave(I think!)

Think my problem is in the signalling board area but what I am
struggling with is as it uses gates and invertors it is really
difficult to get your head around it without any gist of what the
circuit is trying to achieve. Even if I could find something similar
to look at it would help.

Peter