[Farmall] Tachometer

[Robert L. Holtzer]

Thanks for the response.

Bob Holtzer

At 05:52 PM 12/20/2004 -0500, you wrote:
>I have one of those. There is a switch to configure it for the number of
>blades on the prob. Mine has a setting for a two blade or three blade prop.
>
>It works by looking at the reflection from the prop. The electronics count
>the number of times the blade passes the lense and then calculates the
>correct RPM based on the switch setting.
>
>If you were to paint two white marks on the fly wheel or pully then it
>should work just fine for reading tractor RPM. If you paint just one flag
>then you would have to multiply the RPM reading by 2.
>
>The only problem may be the contrast. You need enough of a signal for the
>counting circuit to work. With a prop that is not much of a problem. It is
>either there or not. A flywheel may have other reflections or holes that
>the optical ckt could mistake for a flag.
>
>I have used strobe lights to measure rpm. My company has one with a
>calibrated dial. You illuminate the shaft/ pully etc with the strobe and
>adjust the frequency so the shaft appears to stop. You can read the RPM off
>the dial.
>
>
>
>
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