RE: [CAD_CAM_EDM_DRO] Sheffield 3 Axis DRO Display

Thanks Guys

You're talking WAY over my head here; just thought DRO would be nice; easier
to see accurately at my age than the dials. Think I'd be better off
sticking with what I know; as I said my machines are just expensive toys.
Who knows, in a few years DRO may become cheap like I've seen calculators
go.

I remember seeing a pocket sized calculator that added, subtracted,
multiplied and divided advertised for a shocking bargain of only
$99.99!!!!!! Memory in one was unheard of in those days; just having a
digital calculator that would fit in your pocket was something else.

Lew

-----Original Message-----
From: Paul [mailto:Paul.Corner@...]
Sent: Friday, July 20, 2001 2:14 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Sheffield 3 Axis DRO Display


Hi Lew

As david has already pointed out, without scales it is just a doorstop. I do
have a set of encoders with a 15 pin D plug on the end - But after trying to
get a replacement, I have found each manufacturer uses their own pinout and
favoured plug. Some will use a HD 15 pin D, others, a 9 pin D, and also
circular styles are common.
Then there are the different types of outputs - TTL quadrature, 1V sine and
11uA sine waves. To add to the confusion, some scales (like mine) require a
6V
DC supply.
http://www.heidenhain.de has plenty of data on the various output signals
and
connectors of their scales.

So without the scales and/or detailed info about the box - Leave it for some
mug to buy.

If you realy want a cheap DRO - Have a look at Tom Kaluga's card, Dan Mauch
can
supply the card quite cheaply. EMC can also utilise the card if/when you
start
playing with CNC (sorry, had to get the plug in)


Regards, Paul.

On Fri, 20 Jul 2001, lew best wrote:
> Hi
>
> Does anyone know anything about this Sheffield 3 Axis DRO Display Item #
> 1618432646 on ebay? What else would be needed to use it on my Bridgeport
J
> head or Sebastian lathe?
>
> If it didn't cost too much to buy and set up (hobby use only, no income
> generated) it would be nice to have as I'm 58 and the old eyeballs aren't
> what they used to be.
>
> Any info appreciated.

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