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Old 11-26-2016, 02:43 AM
h_2_o h_2_o is offline
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Broke shaft, straightning shaft, keyways and props

So there is a youtube guy keith fenner anyway his latest set of videos he had a broken shaft. his latest set of videos he went over what caused the break, straightening of a new shaft, prop lapping, keyways and other interesting things. Yes it is on a much much larger scale than what we deal with but the principles are the same. It is a good watch and I think pertains to our boats that is why i didn't put this in the other youtube thread.

anyway I was curious if anyone hear laps their prop when fitting it to their shaft after watching the video it seems like a good idea. Along with making sure that your key is properly seated. Also does MC lap the coupling end or should that be done as well?

Part 1,2,3,4
https://www.youtube.com/watch?v=8ZJFP9vEFJY
https://www.youtube.com/watch?v=HCqIjxmmmzw
https://www.youtube.com/watch?v=Fe-7PPH7HIk
https://www.youtube.com/watch?v=y6-QkmTbbIE

Extra video that has some cool stuff in it as well
https://www.youtube.com/watch?v=0GdPiVH5Hqk
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Old 11-26-2016, 12:37 PM
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mikeg205 mikeg205 is offline
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I have seen some of these - I didn't lap the shaft because when I change my set home when I put it on... no play even before tightening.
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Old 11-26-2016, 08:09 PM
h_2_o h_2_o is offline
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isn't that the point of the lapping and the blue compound because it is tapered and it will feel like a correct fit but as you can see when he does it and even pbase has a good writeup about it http://www.pbase.com/mainecruising/fitting_a_prop that a prop can feel snug with only about 30% of it really fitting on the shaft.
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Old 11-26-2016, 08:25 PM
waterlogged882 waterlogged882 is offline
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I am sure there is some merit to lapping a prop/shaft to some degree or another but I don't see it for most applications. I say that relative to lapping a valve seat for the proper fit (100% seating surface) but that has implications of radiological concerns downstream of the valve. A prop is a little less critical. Not saying your point to this is any less important or less valid to the good of the cause.

If I get a prop back on over the key way or onto the spline and it runs back up the shaft to where it was when I took it off.... it's good for me...

The guy on pbase is well versed in his discipline of sea vessels and such.

Thanks for the links and information.

.
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