I set up my new prop shaft on a bench with a dial indicator. I checked it at the 9 O'clock position and the 12 O'clock position.
The runout is .004" in the center of the shaft. I was suprised at how easily these shafts flex. Pushing down with my finger on the threads by the prop it is very easy to get the shaft to flex out .010" to .020" in the center 24" away from the threads. Just the weight of the prop being mounted bends the shaft .001" when measured in the center of the shaft at the 12 O'clock position.
The idea of having run out to with in .002" in the center of the shaft is impossible while mounted on a boat. And once it's running it would have to be pretty far out, measured in 1/16" instead of thousands.
Has anyone measured the run out on a shaft out or in their boat? What are the specs for runout at the coupling with everything mounted in the boat?
The runout is .004" in the center of the shaft. I was suprised at how easily these shafts flex. Pushing down with my finger on the threads by the prop it is very easy to get the shaft to flex out .010" to .020" in the center 24" away from the threads. Just the weight of the prop being mounted bends the shaft .001" when measured in the center of the shaft at the 12 O'clock position.
The idea of having run out to with in .002" in the center of the shaft is impossible while mounted on a boat. And once it's running it would have to be pretty far out, measured in 1/16" instead of thousands.
Has anyone measured the run out on a shaft out or in their boat? What are the specs for runout at the coupling with everything mounted in the boat?
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