Re: CNC band saw, FPM LED display

Interesting web site.
Really glad I asked the question here.
Thanks to all for the ideas.

dan k

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "v_fong" <v_fong@y...> wrote:
> We built one to count the rev of our lathe, if interestest I can
send
> you more info.
> http://www.embeddedtronics.com/
> Gives you an idea of the stuff we are capable of. Look at
> metalworking, there we converted a micromill to CNC.
>
> Sincerely,
>
> Kin Fong
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> > In a message dated 10/16/2003 12:18:59 AM Central Standard Time,
> > dk1machine@y... writes:
> > Anyone know of a source for a low-cost display and appropriate
> > electronics (or a schematic to build same) that will count the
> input
> > shaft turns
> > I needed to count turns on my engine-lathe which I also use for
> winding
> > transformers, so I mounted a salvaged loudspeaker "alnico" magnet
> in a delrin
> > collar, and put two Hall-effect sensors on a tiny PCB-mount so
that
> the magnet
> > passed by them both so that they provided a "quadrature" output
> (one was ON when
> > the OTHER one changed ON/OFF (or OFF/ON)) (that is, the two Hall-
> effect IC's
> > (look kinda like TO-92 transistors) could be BOTH "covered" by the
> magnet at one
> > time). This provided "TTL outputs" (actually, "HCmos" output
> swings!), and
> > is VERY reliable.
> >
> >
> > [Non-text portions of this message have been removed]