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Rudder gudegons/pintles


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#1 Knot Me... maybe

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Posted 23 November 2017 - 07:01 PM

A carbon fibre rudder 'box' held on to UHMWRE barings with a 316 SS pin.

 

The pin on the box the SS will touch I'll make in E glass to keep it off the carbon which will encapsulate it all.

 

The 'box' is not quite one as such, more a basket so we can adjust the rudder while sussing the best angle for a fun bit it has. Once we get that sussed it will be glued and glassed onto the blade more permanently. 

 

2 questions -

Any issues with the above combo of materials?

Is there a better plastic than Umpy for the barings. There are 3 of them 30mm long, I have 3 pintles, load shedding...I hope. The SS pin is 16mm.


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#2 native

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Posted 24 November 2017 - 06:08 AM

Sounds alright, uhmw may wear but the idea is to get a large bearing surface. A lot of rudders have needle rollers to deal with the loads, the plastic may get sloppy depending on its exact properties. I'd check out vesconite from chatfields or do some research on the properties of engineering plastics.


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#3 Steve Pope

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Posted 24 November 2017 - 08:17 AM

2nd Vesconite at Chattys.


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#4 SloopJohnB

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Posted 24 November 2017 - 09:37 AM

Orkot

 

http://www.orkot.com...e/homepage.html

 

http://www.orkot.com...ial_grades.html

 

Somewhere n the Crew archives there's a tropic on bearings.


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"With age comes wisdom .... and with wisdom comes the knowing when to avoid perfection!"


#5 Knot Me... maybe

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Posted 24 November 2017 - 10:54 AM

Is that Vesconite a plastic?

 

I seem to have developed a large aversion to things metal. I've near waking in cold sweats due to some SS piano hinge in the galley :)


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#6 Steve Pope

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Posted 24 November 2017 - 01:55 PM

Google Vesconite, all the info is available, & yes it is a "plastic" type material. Chatfields are very helpful.


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#7 Knot Me... maybe

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Posted 24 November 2017 - 03:05 PM

Went to Chatfields and purchased some Vesconite.

They have quite a large range and were using it in lots of places, many being shaft related.

My lad is machining it as I write.

 

I think I like where today ended better now, thanks fellas.


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#8 Knot Me... maybe

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Posted 24 November 2017 - 04:32 PM

Anyone know if this Vesconite expands in wet?

 

How firm should I drill the holes is what I'm pondering.


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#9 MartinRF

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Posted 25 November 2017 - 07:37 AM

Trelleborg is a place in southernmost Sweden.

https://en.wikipedia...wiki/Trelleborg

 

Good to know if it ever comes up in a pub quiz.

 

I don't know about Vesconite. I have been recommended to use Robalon for this type of application.

http://www.leripa.co...n-plastics.html

 

Nylon and Teflon are both absorbing water and swell quite a bit while doing so.

 

/Martin


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#10 Knot Me... maybe

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Posted 25 November 2017 - 08:04 AM

After seeing what Vesconite was being used in yesterday, some large and serious shaft barings for a ferry I think the 1/1000000th of the load they will have to cope with on the old family cruzer should be fine.

 

I did some sussing and it is, should be, a lot better the Umpy. You'd hope so at nearly 8 times the price.

 

Turned them (3) up last evening, about to get jiggy and put them in ........ after some stress related to 'have I got them straight and in the right pace?'.

 

The stuff machines very nicely.


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