Re: [CAD_CAM_EDM_DRO] Older Bridgeport DRO help needed!

On Tue, Apr 09, 2002 at 06:01:45AM +0000, Jon Elson wrote:

> mhead28 wrote:
>
> > I have an older Bridgeport thextron 1810122 DRO head unit that
> > appears to be in good working condition. The rear has 6 pin military
> > type connectors on it for the scales. Does anyone know the pinouts of
> > these?
> >
> > I have some gurley/teledyne linear scales (8780,8770) that I would
> > like to use with it. THey have plastic connectors that are using 7
> > pins. I assume the bridgeport uses the metal housing as the shield. I
> > need to figure out how to connect the 2. I found out from gurley that
> > the scales use:
> >
> > Pin 1 + 5VDC Red
> > Pin 3 + 8VDC Blue
> > Pin 5 Sine output Green
> > Pin 6 Cosine Output Yellow
> > Pin 10 Reference Zero White
> > Pin 12 Ground Black
> > Pin 14 Shield
>
> Depending on the date, sometime around 1970, all the US makers switched
> to metric scales, and put mm -> inch conversion in their readout boxes.
> So, you can't cross that bridge, in general. So, make sure both your old
> scales and the new ones read out in the same units.
>
> Second, these labels sound like these Teledyne/Gurley might be analog scales,
> rather than logic signals. That could be a big problem.
>
> Jon
>

I think they used a preamp board in their readout that converted
the sin/cos scale output to digital.

Paul

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix / Windows / NT