- #1

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Diameter of tachometer: 31.5mm

Diameter of motor shaft: 12mm

RPM of tachometer: 1400rpm

What calculation would i need to work out the rpm of the motor shaft?

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- Thread starter Tweaked9107
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- #1

- 23

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Diameter of tachometer: 31.5mm

Diameter of motor shaft: 12mm

RPM of tachometer: 1400rpm

What calculation would i need to work out the rpm of the motor shaft?

- #2

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- #3

Filip Larsen

Gold Member

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_{s}= RPM_{t}* d_{t}/d_{s}, where subscript s is for shaft and t for tachometer. With the values you gave, the 1400 tachometer RPM then corresponds to 3675 shaft RPM.

Yeh thats the answer I had as well. I just thought it seemed too simple to be the same principle as gear ratio's. Thanks for your help.

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