Re: CNC band saw, FPM LED display

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]