rpm this direct bounced. here is resend
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> User mailbox exceeds allowed size:
> alm1@m...
> Original message follows.
> To: john@l...
> Subject: RPM DETECTION
> PAINT THE SHAFT WHITE ALL THE WAY AROUND THEN PAINT
> A FINE NARROW
> BLACK LINE PARALLEL WITH THE LENGHT OF THE SHAFT.
>
> COLORS MAY BE REVERSED.
>
> USE A PHOTO DIODE TO DETECT WHEN THE BLACK LINE
> PASSES.
>
> PHOTO DIODE IS MUCH FASTER OPERATION THAN A
> MECHANICAL REED SWITCH
> AND NO MAGNET TO SLING OF AND HIT SOMETHING.
>
> 73 SPENCE
>
> alm1@m...
> Original message follows.
> To: john@l...
> Subject: RPM DETECTION
> PAINT THE SHAFT WHITE ALL THE WAY AROUND THEN PAINT
> A FINE NARROW
> BLACK LINE PARALLEL WITH THE LENGHT OF THE SHAFT.
>
> COLORS MAY BE REVERSED.
>
> USE A PHOTO DIODE TO DETECT WHEN THE BLACK LINE
> PASSES.
>
> PHOTO DIODE IS MUCH FASTER OPERATION THAN A
> MECHANICAL REED SWITCH
> AND NO MAGNET TO SLING OF AND HIT SOMETHING.
>
> 73 SPENCE
>