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

[Kristian Larson]

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
> _______________________________________________
> These businesses support your Association:
> http://www.alberg30.org/store/A30supporters.html
> Please support them.
> _______________________________________________
> Public-List mailing list
> Public-List at lists.alberg30.org <javascript:;>
> http://lists.alberg30.org/listinfo.cgi/public-list-alberg30.org
>

 1387341954.0