Propeller shaft wear

[philmarks]

MY shaft is 40mm thick (I'll ignore smart ar*e comments). At the inner gland it's worn to a shade under 38.5mm.

Can anyone advise what is considered to be the maximum wear acceptable, before I replace the shaft?

Also, can the wear be corrected by metal spraying or somesuch and remachining?

Thanks in advance for help

Phil

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Phil

 

[longjohnsilver]

Can you turn it round so that the wear area is out in the open so to speak and the bearings are then against a different part of the shaft.

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[philmarks]

I'd thought of that, but then I would have a tapered end clamped into my halyard aquadrive, which would not I think be successful as it would not clamp properly.

It's a 9' shaft so I suppose if I have to get a new one there would be a reasonable secondhand value to the old one.

Phil

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Phil

 

[jerryat]

Hi Phil,

You can certainly get the shaft re-metalled, then re-ground and polished. This is a common practice for bearings, gearbox shfts etc. Whether the cost makes it worthwhile is something you can only judge when you've got a price. Most medium and larger engineering engineering companies will either be able to do the work themselves or have a contact for doing this sort of work.

I would check the yellow pages for your area and go from there. They will also be able to check the shaft for trueness at the same time.

Cheers

Jerry

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[capsco]

Any of the options will not be cheap for a shaft of your size, is your gland leaking badly??? this is more important than the amount of wear, another option to consider is one of the deep sea seal type components, or subject to prop clearance you could introduce a 25mm spacer between the g/box flange and the Halyard set up, this would require the thrust bearing housing to be moved back by the same amount.

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[brianhumber]

Specialist machinsts will be able to
1) Metal spray and turn down to original diameter
2) Turn down and sleeve to original diameter

Neither are very complicated jobs, we used to do them at sea as a matter of course on big pump shafts - if you have a lathe its an easy enough job.

Unless you have cracking in way of the worn down area I would not be worried about rebuilding up from 38mm to 40mm dia

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[Paragon]

FWIW

I've just had a new 1" shaft fitted at about 2 metres long and it was £96, so bear that in mind when getting quotes for remachining etc.

Regards

John

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[philmarks]

Thanks for all advice nm.

.

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Phil

 

[philmarks]

I cannot fit a deep sea seal - not enough space to clamp onto stern tube - that would have been my best option; also much too complex to insert spacer given my set up as thrust bearing is part of a steel box which takes downthrust from mainmast, although prop clearance not a problem.

Thanks

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Phil