[Electric Boats] Re: Bearing Storage and Intermittent Use

 

Hi, Kevin, I agree with you that the issue is probably insignificant, 

other than that if you are carrying a spare bearing, and going places where bearings are not readily available,

it might be best to store it on it's side.

The information session I attended though did not seem to consider the ball or roller, just the 'brinelling' of the races themselves, which can be 'redirected' by storing on the side, so that the brinelling occurs on a part of the races that is not used when the bearing is installed.

I agree with you too that it might be better to damage the bearing, or run risk of it, rather than put up with the prop drag for every mile covered. Keeping things simple, as you say, there is generally lot's of warning time for a bearing failure, just make sure to keep the grease flowing!

I also suspect that there is a lot of difference between a boat moving on swells, and a vibrating industrial building, again adding to the probable lower significance.

 

John

 

 

 

3a. Re: Bearing Storage and Intermittent Use Posted by: "Kevin Pemberton" pembertonkevin@gmail.com the_right_lane Date: Thu Dec 13, 2012 2:58 pm ((PST)) I don't think it makes much difference how the bearing is stored. On it's side the area the ball rests would be smaller maybe. The ball would still rest and the ball would still wear. Not on it's side the ball will still wear but the race location that would wear would be in the path of the working balls. A ball bearing is sold as a class of bearing the smaller the number the smoother it runs. Motors and gear housings use a low grade bearing a spindle on a machine tool uses a higher quality of bearing. Because surface finish is not being produced as it would in a machine tool what does it matter? The number of flat spots on race and ball will increase noise while the machinery is run but should last a long time anyhow. I think longer than most people will use the boat anyhow. A free wheeling prop may add drag and make a sail boat cruise at a slightly slower speed but all factors in design are a compromise. I would try for a faster cruise if it were me but you may choose otherwise. Kevin Pemberton

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