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Calculating RPM?

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Njguy

Member
I know that a tachometer shows rpm, but I would like to calculate the rpm of a rotary shaft, and I'm not sure how to do it. What is the hardware that actually gathers the rpm data?
 
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Mr RB

Well-Known Member
Buy a $25 optical tacho, you can get them just about anywhere now (like tool stores, retailers, even Ebay is full of them).

Just stick a white or black sticker on the shaft and point it, the tacho tells you RPM.
 

Bob Scott

New Member
Buy a $25 optical tacho, you can get them just about anywhere now (like tool stores, retailers, even Ebay is full of them).
Especially hobby stores, for counting model airplane propeller RPM.

Bob
 

Dean Huster

Well-Known Member
The Tektronix DC503 frequency counter had an internal slide switch that you could set to provide a display in RPM vs. Hz. Never did see any other counter that did that. I though it could be a really handy feature but never did use it myself.
 

unclejed613

Well-Known Member
Most Helpful Member
function generator in pulse mode, and an LED (high brightness white ones work best). frequency in Hz*60=rpm. as was mentioned above, a black mark or a sticker makes for a good "indicator" to use with the strobed LED
 
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