When I removed and rebedded my deck hatches, I drilled oversized holes and
filled them
with West System epoxy and microballons at about a ketchup consistency. Then I
drilled
pilot holes & screwed in the fasteners. This seems to have been a bad idea, as
the epoxy
had no give & some cracks resulted. Clearly, my usual approach to through-bolted
fittings
in the cored deck is not going to work for screws. Could somebody give me a
better idea
for placing/replacing screws in the balsa-cored deck?
Thanks.
Thomas
L’Audace, F-33 #66
Did you scoop out some of the balsa core around the oversized hole? I think that is part of the key to locking the epoxy into the core. Also, there may have been a problem with your epoxy or its cure, as I’ve never had any crack.
Al Lorman
F30 Ab Initio
-----Original Message-----From: freedomyachts2003@yahoogroups.com [mailto:freedomyachts2003@yahoogroups.com] On Behalf Of tgcmdSent: Saturday, January 07, 2006 1:17 PMTo: freedomyachts2003@yahoogroups.comSubject: [freedomyachts2003] Screws in cored deckWhen I removed and rebedded my deck hatches, I drilled oversized holes and filled them with West System epoxy and microballons at about a ketchup consistency. Then I drilled pilot holes & screwed in the fasteners. This seems to have been a bad idea, as the epoxy had no give & some cracks resulted. Clearly, my usual approach to through-bolted fittings in the cored deck is not going to work for screws. Could somebody give me a better idea for placing/replacing screws in the balsa-cored deck?Thanks.ThomasL’Audace, F-33 #66
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If you make a stiff epoxy,you can drill and tap the holes for bolts. That
way the epoxy won’t be under any pressure.Use coarse thread. Jerry F-33 #68
----- Original Message -----
From: “tgcmd” <Finesse@…>
To: <freedomyachts2003@yahoogroups.com>
Sent: Saturday, January 07, 2006 1:17 PM
Subject: [freedomyachts2003] Screws in cored deck
\
When I removed and rebedded my deck hatches, I drilled oversized holes and
filled them
with West System epoxy and microballons at about a ketchup consistency.
Then I drilled
pilot holes & screwed in the fasteners. This seems to have been a bad
idea, as the epoxy
had no give & some cracks resulted. Clearly, my usual approach to
through-bolted fittings
in the cored deck is not going to work for screws. Could somebody give me
a better idea
for placing/replacing screws in the balsa-cored deck?
Thanks.
Thomas
L’Audace, F-33 #66
Epoxy, particularly with the West 404 Hi Density Filler, is
unforgiving in that respect. You need to go with a larger pilot
hole. I have also tapped threads and used a machine screw.
When I removed and rebedded my deck hatches, I drilled oversized
holes and filled them
with West System epoxy and microballons at about a ketchup
consistency. Then I drilled
pilot holes & screwed in the fasteners. This seems to have been a
bad idea, as the epoxy
had no give & some cracks resulted. Clearly, my usual approach to
through-bolted fittings
in the cored deck is not going to work for screws. Could somebody
give me a better idea
for placing/replacing screws in the balsa-cored deck?
Thanks.
Thomas
L’Audace, F-33 #66
Don’t know if this is better but its been working for me for about a year. A
year ago I installed new hatches (manship stainless so they’re quite stiff).
I drilled oversized holes, don’t recall hitting any balsa, filled with epoxy,
then drilled holes for the screws but with a tapered bit to match the size of
the screw. I did not tap them.
One thing I noticed was that the original hatches had screws in each of the 4
corners and there was cracking there. My new hatches as well as the new models
of the bomar plastic hatches that replace the original ones used by Freedom
don;t have screws in the corners.
Alan F-33 Hull#51 1982
Quoting tgcmd <Finesse@…>:
When I removed and rebedded my deck hatches, I drilled oversized holes and
filled them
with West System epoxy and microballons at about a ketchup consistency. Then
I drilled
pilot holes & screwed in the fasteners. This seems to have been a bad idea,
as the epoxy
had no give & some cracks resulted. Clearly, my usual approach to
through-bolted fittings
in the cored deck is not going to work for screws. Could somebody give me a
better idea
for placing/replacing screws in the balsa-cored deck?
Thanks.
Thomas
L’Audace, F-33 #66
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I used to drill right-sized holes for selftapping screws, then
impregnated the balsa core with thin epoxy. This is absorbed by the
balsa and makes an impermeable zone around the screw hole. With larger
holes, I put in a second spurt of epoxy after a while. I use a special
thin epoxy that is used to fix rotted window sills. It’s very thin.
(this epoxy solution is flexible; epoxy wth micro bALLOOns is not
flexible and therefore cracks when you force in a self tapping screw.)
Then I screw in the self tappers before the epoxy cures.
When I removed and rebedded my deck hatches, I drilled oversized
holes and filled them
with West System epoxy and microballons at about a ketchup
consistency. Then I drilled
pilot holes & screwed in the fasteners. This seems to have been a
bad idea, as the epoxy
had no give & some cracks resulted. Clearly, my usual approach to
through-bolted fittings
in the cored deck is not going to work for screws. Could somebody
give me a better idea
for placing/replacing screws in the balsa-cored deck?
Thanks.
Thomas
L’Audace, F-33 #66