Re: [CAD_CAM_EDM_DRO] Re: Homebrew DROs

Gentlemen,

Newark Electronics supplies the HEDS-5500 series encoders for about 42.00
each. They interface perfectly with the HCTL 2020 16 bit quadrature decoder
counter chips from the same source. These are a wonderful combination. All
that is needed to get the counters working is a ceramic resonator. I use
them in a control I build and install on machines I retrofit. I use a PC to
retrieve the three axis counts and display them in large letters on a PC.
Tom Eldredge, Trustee

----- Original Message -----
From: Alan Marconett KM6VV <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 14, 2001 2:58 PM
Subject: [CAD_CAM_EDM_DRO] Re: Homebrew DROs


> Neil,
>
> There are C compilers for the PIC, at about $125 (CCS). Floating point
> is limited! For a DRO, You'd count encoder steps for the three axis,
> and DIVIDE steps by the resolution of the resolution of the encoder *
> leadscrew. I think I'd like a 4-line display (I have both 2 & 4), Then
> you'd get XYZ and spindle speed?? It would be cheap if we didn't have
> to use the U.S. Digital shaft encoders. HP had some also, as I recall.
> A fast pic could probably watch 3 encoders, and an opto-sensor for a
> tach.
>
> It would make a nice project, anyone interested?
>
> Alan KM6VV
>
>
> Neil Gillies wrote:
> >
> > Hi
> >
> > snip...
> >
> > >How about:
> > >
> > >4. Build a DRO based around a PIC & one of the cheap 2-line LCD display
> > >units.
> >
> > OK, the LCD display is a _very_ easy option - in fact the lash-up I made
> > already has the LCD on my target board.
> >
> > The reason for using the Mac or Palm, is so that it makes it easier for
> > __ME__ to program - ever tried doing calibration and calculation stuff
in
> > asssembler on a PIC ? (or similar :-) - a real PITA. Hence the reason
for
> > doing it in basic/pascal/c++ whatever on the mac (even hypercard or
> > supercard for that matter :-)
> >
> > Maybe sometime later when I'm a bit older.
> >
> > Cheers
> >
> > Neil
>
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