Re: [CAD_CAM_EDM_DRO] Re: Fresh run at homebrew DRO

J. Mark,

Until I get the full spec out to ya, check out this link. This describes
the Mitutoyo SPC format of the data. It even has a PIC circuit to interface
with it.

It lists a connector to interface (a 10 pin) but it looks like it's
different than what you have.

http://63.140.207.28/glib/muse145.pdf

HTH

James

----- Original Message -----
From: "J. Mark Wolf" <jmarkwolf@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, January 13, 2002 8:29 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Fresh run at homebrew DRO


>
> "Dr.D" <mfea_2000@...> wrote:
> J. Mark Wolf and Doug,
>
> Doug is correct about the output of the scales. The "horizontal quill
kits" outputs a analog signal. When they say that the scales are "Digital",
they mean that the scale has a LED that show digits you can read, not a
digital output. The output can be plugged into a digital readout display but
it is configured to accept and decipher the signal. The best place to find
out about these system is from the guys that invented these scales at
www.proscale.com. ( No Mitutoyo did not invent them) They have digital
readouts that should interface with you scale and I understand that the
pricing is very reasonable.
>
>
> Thanks for the input Doug and Dr. D.
>
> I should have stated my application a little better.
>
> I can't comment on the applicability of these quill kits for servo
controlled mills, since my application (and experience to date) is only for
a simple position readout on a manually controlled mill/drill.
>
> As for the output signal from these "quill kits" they do refer to it as
SPC output, and it is indeed a synchronous serial bit stream. The bit stream
is 1.5 volt amplitude with the prettiest clock and data edges you've ever
seen. The datasheets provided with the quill kits describes the protocol as
24-bit transmission, transmitting each "datum" twice, with a transmission
every 300mS. The pin-out on the 4-pin connector is defined as power,
ground, clock and data. The data and clock signals will have to be
translated to 5 volt levels to be useful, but this is done with a simple
comparator circuit.
>
>
> My background is embedded computers and would like to build a fancier
read-out head than the single axis LCD or the three axis LED "dumb" readout
head that is available for these scales. I've got most of the parts
including displays in my junk box. With a small computer between the quill
kit and the read-out head a number of things can be accomplished simply.
Such as programming bolt hole patterns, with current location and target
location indicated, etc. But I have to find the silly mating connector/cable
to make it practical.
>
> Any ideas?
>
>
> "May a suitable landing spot be always on your glide slope"
> J. Mark Wolf, Pinckney, Michigan
> Rotorway Exec162F N1955Z
> Check out my web site at: www.rotorwaybuilders.net/ucosm
>
>
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