Re: [CAD_CAM_EDM_DRO] Older Bridgeport DRO help needed!

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