[Public-List] Newbee Looking for help with rudder parts

[vmarmei]

  Yes man....
Now you are talking my language..... Yes they can be machined from 
bar stock. They can be machined stronger with beefier wings with 
screw holes that go from side to side right through the boat back 
keel. You can machine them wider and stronger with pockets for a 
split replaceable bushing and make them a little longer in the front 
to take 4 smaller screws for extra strength. A sandwiched bolt 
through set up is much stronger and better than any bolt screwed into 
fiber glass.
The same situation applies to the bottom shoe and shaft end of the 
rudder. The A30 should have an 1 inch replaceable bushing and shaft 
end at the bottom of the rudder shoe also.
Villo Marmei
A30 618/641


At 11:45 PM 17/12/2013, you wrote:
>I have wondered if the gudgeons could be milled out of a couple pieces of
>1" square (or larger) bronze bar stock... Seems pretty straight forward.
>Why cast them when you have to mill them anyways. More waste I guess.
>  Maybe I'm missing something. I'm not a machinist.
>Kristian
>
>On Tuesday, December 17, 2013, Kris Coward wrote:
>
> > On Tue, Dec 17, 2013 at 04:06:36PM -0500, Gordon Laco wrote:
> > > Thanks Jeff -
> > >
> > > I think the split ones fit rudders that have large pintles built into
> > them.
> > > Rather than a pin, there is an aperture whose mouth is crossed by a heavy
> > > shaft (the pintle) that is embedded in the rudder on both ends. You have
> > to
> > > use gudgeons that can be opened.
> > >
> > > $600 is not bad for custom made fittings taking casting, vibro-polishing,
> > > fine polishing and machining into consideration.
> > >
> > > I make self steering vanes, and had a fellow getting hot with me over
> > email
> > > last week over what I have to charge for them.  There are eleven
> > castings in
> > > a vane... He thought I was 'greedy' for asking $4,500 for a complete unit
> > > ready to install.  He thought I should charge $1,500.  I tried to explain
> > > that machining the castings costs more than that....
> >
> > But machining castings is easy and should be cheap. I mean castings
> > *always* cool evenly, and *never* have irregularities that crystallize
> > into carbides. You just have to enter a bit of gcode to blast your
> > endmill clear across them, confident that the cnc controller will take
> > care of the job for you, and that your tools won't get shattered by a
> > hard spot, nor will the impact of your tool with a hard spot jar the
> > workpiece loose, and throw off the positioning and alignment for the
> > remainder of the operation. I just don't understand why the machinists
> > get so fussy, and demand so much pay for such a simple job :P
> >
> > </sarcasm>
> >
> > -Kris
> >
> > --
> > Kris Coward                                     http://unripe.melon.org/
> > GPG Fingerprint: 2BF3 957D 310A FEEC 4733  830E 21A4 05C7 1FEB 12B3
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