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 Post subject: Mast Wobble No More
PostPosted: Sun Jan 27, 2013 5:43 pm 
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Joined: Tue Jul 19, 2005 6:29 pm
Posts: 1986
Location: High Point, NC
At first I thought it might be my forward Aka slipping, but that seemed impossible due to how it mounts. A rough water day with the sail furled exposed the problem.

http://www.youtube.com/watch?v=ldkMmaGP ... e=youtu.be

I took a section of nylon tubing and bored the inside...

Image

Turned the outside...

Image

To the appropriate sizes. Then epoxied the extremely thin collar to the mast base and fine tuned the fit.

Image

It's very clean now. Extremely little wobble. To be honest, it wasn't really hurting anything, but the "CLUNK" was a little disconcerting. Now it slips into place easily, but no more "clunk."


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 3:55 pm 
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Joined: Sun Dec 30, 2012 12:24 pm
Posts: 68
Location: NJ
Well done Tom....nice to see a fellow rod builder on the board :mrgreen: ....i may do this with some guerilla tape, my AI mast has a bit of slop...wishing i had a metal lathe.....i could throw the mast on my spinner and do multiple coats of epoxy until its perfect, i do this with ferruls sometimes

I would think even just that little bit of slop puts more strain on things..

So what kind of buttwrap are you guna do on that thing? :mrgreen:

-Jeff


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 4:31 pm 
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Joined: Tue Jul 19, 2005 6:29 pm
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Location: High Point, NC
If it wouldn't be covered up by the mast....

Tape would probably take up the slop as well, but being somewhat soft it may not provide a good surface for the roller bearing to work against.

Something I thought about - a wrap of D thread coated with maybe 5 applications of Permagloss would take up about 1mm and offer a rock hard surface for the bearings to roll on. That might be a simpler way to do this.


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 5:06 pm 
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Joined: Sun Dec 30, 2012 12:24 pm
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Location: NJ
Yea definitly and the adhesion would be better with epoxy on epoxy.....having a constant supply of epoxy on hand is always helpful :mrgreen: .....i may try this need to check how much slop i have


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 5:45 pm 
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Joined: Tue Jul 19, 2005 6:29 pm
Posts: 1986
Location: High Point, NC
PG is much, much harder than any epoxy. Thus the bearings should turn nicely on it.


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 6:36 pm 
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Joined: Sun Dec 30, 2012 12:24 pm
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Location: NJ
Looks like good stuff, always had good luck with u-40 products.....probly stick with epoxy if i do it tho free is always better :mrgreen:


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 Post subject: Re: Mast Wobble No More
PostPosted: Mon Jan 28, 2013 7:49 pm 
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Joined: Tue May 08, 2012 8:16 pm
Posts: 56
Location: Tampa, FL
BEST LINE EVER, " I don't like it, and I'm going to fix it.". Well done, sir.


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 Post subject: Re: Mast Wobble No More
PostPosted: Tue Jan 29, 2013 4:29 am 
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Joined: Thu Aug 16, 2007 2:25 pm
Posts: 1946
Location: Central Coast NSW Australia
Tom Kirkman wrote:
Something I thought about - a wrap of D thread coated with maybe 5 applications of Permagloss would take up about 1mm and offer a rock hard surface for the bearings to roll on. That might be a simpler way to do this.

Tom,
I'm interested in this "D thread". What is it exactly?
I'm looking for a better way to build up the TI's furling drum taper so that it fits the AI's mast tube.
Great workshop setup BTW! 8) :mrgreen:


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 Post subject: Re: Mast Wobble No More
PostPosted: Tue Jan 29, 2013 5:46 am 
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Joined: Tue Jul 19, 2005 6:29 pm
Posts: 1986
Location: High Point, NC
Nylon rod guide wrapping thread in size D. This allows you to keep the drum concentric without having to do any machine work. The coating is an ultra-hard aerospace moisture curing urethane developed by a former Boeing chemist, although there are likely others that would work equally well.


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 Post subject: Re: Mast Wobble No More
PostPosted: Thu Jan 31, 2013 4:11 am 
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Joined: Thu Aug 16, 2007 2:25 pm
Posts: 1946
Location: Central Coast NSW Australia
OK gotcha. Thanks for that.


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