[Public-List] Rudder Shoe Casting Shrinkage Issues

[brooks.glenn at comcast.net]

Sounds like shrinkage is not a big deal with the shoe, but what about the grudgon? particularily the inside measurement that allows the snug fit to the rudder and aft end of the keel? 


Does anybody have a measurement of the keel width where the grudgon bolts in? 


glenn 
Dolce 318 

----- Original Message -----
From: "Peter McEvoy" <peter.t.mcevoy at gmail.com> 
To: public-list at lists.alberg30.org 
Sent: Monday, July 16, 2012 9:43:49 PM 
Subject: [Public-List] Rudder Shoe Casting Shrinkage Issues 

Thanks Gordon and George for chiming in about the rudder shoe casting and 
whether or not shrinkage will be an issue for us. 

To keep it short, I really don't think it will be an issue. Shrinkage of 2% 
would indeed matter for an auto part, as Gordon cautioned. But for this 
situation, it really just needs to fit snugly on the butt of the keel. From 
my reading, I understand that the shoe is placed on the keel with an 
intermediary layer of epoxy or adhesive, and then drilled into the keel- 
this sounds to me like there is some wiggle-room. Even with maximum 
shrinkage, we'd only lose 3/32" in length and 3/64" in width. I would call 
that negligible. 

Then again, I don't know how picky people are. Anybody whose replaced a 
shoe- do you think these numbers will make a difference? 

We could make the mold bigger if this is necessary, it's just more work 
(and mold-material cost). I wish it were as simple as Kris suggested- to 
heat the piece to increase it's size before taking the mold- but alas, the 
mold material (urethane rubber) is heat sensitive and also cures over a 
span of 24 hours or so, which would not make the method practical. We could 
do it if we need to, but let's see what hands-on-experienced folks think 
first. 

UPDATED LIST: 

Rudder Shoe: 
Bill Ydel - wcydel at gmail.com 
Mike Lehman - sail_505 at hotmail.comJeff Fongemie - fongemie at gmail.com 
Brian Curry - brian_curry at hotmail.com 
David Mitchell - david at mitchellent.com 
Peter McEvoy - peter.t.mcevoy at gmail.com 
Jim Allocco - jamesallocco at gmail.com 
James Almond - okeebc at gmail.com 
Clayton Zimmerman - cb_zimmerman at hotmail.com 
Jon Budington - jon at globalprinting.com 
Jason ssteen - mpcylinderheads at gmail.com 
Don Lang - potatosailor at yahoo.com 
Gordon White - gewhite at crosslink.net 
Chuck Thomas - thomascwcj at bellsouth.net 
Mark Dietrich - mrkdtrch at yahoo.com 
Glenn Brooks - brooks.glenn at comcast.net 
Joseph Balderson - joebinc at gmail.com 
Jeff Fongemie - fongemie at gmail.com 
James McRury - jdmcrury at yahoo.co.uk 
Rick Leach - rixquik at yahoo.com 
Dana Shafie - Dana.shafie at verizon.net 
LAF "Avalon" #309 - reefed.main at gmail.com 
Bob Bounds - bobbounds at comcast.net 
(Chris Martin notcmartin at yahoo.com TENTATIVE) 

Gudgeon Sets: 
Glenn Brooks - brooks.glenn at comcast.net 
David Mitchell - david at mitchellent.com 
Michael Connolly #133 - crufone at comcast.net 
Peter McEvoy - peter.t.mcevoy at gmail.com 
James Almond - okeebc at gmail.com 
Clayton Zimmerman - cb_zimmerman at hotmail.com 
Jason ssteen - mpcylinderheads at gmail.com (Interested in the two part 
gudgeon and pintle version) 
Don Lang - potatosailor at yahoo.com 
Gordon White - gewhite at crosslink.net 
Chuck Thomas - thomascwcj at bellsouth.net 
Mark Dietrich - mrkdtrch at yahoo.com 
Joseph Balderson - joebinc at gmail.com 
Jeff Fongemie - fongemie at gmail.com 
James McRury - jdmcrury at yahoo.co.uk 
Rick Leach - rixquik at yahoo.com 
Dana Shafie - Dana.shafie at verizon.net 
LAF "Avalon" #309 - reefed.main at gmail.com 
Bob Bounds - bobbounds at comcast.net 
(Chris Martin notcmartin at yahoo.com TENTATIVE) 
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