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Re: Galvanizing a Spar Hinge[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Galvanizing a Spar Hinge
- From: David Topete <d.topete73(--nospam--at)gmail.com>
- Date: Fri, 12 Feb 2010 13:22:10 -0800
Can stainless steel or aluminum or some other metal be used that still provides adequate structural strength? Short of using a case of WD-40, I have called for the use of white lithium grease.
Good question. Depending on how much the spar moves, I can see the galvanizing being worn down. Can you put some sort teflon washer between the spar and the padeyes?
Let me describe this mechanism.
Imagine a spar made of a length of pipe, with round plates welded on each end to close the pipe - now it looks like a spool. Now, weld a gusset or ear on each end of this assembly, so that they project along the long axis. Put a 1.5 inch hole through each of these gussets.
Now imagine you have embed plates or padeyes anchored into a concrete block, which have TWO parallel gussets welded to the embed, with a gap between the two pltes just a smidge wider than the thickness of the gusset plate on the spar. These plates also have 1.5" holes, so that you can fit the spar gusset between the padeye double-gussets, align the holes, and slip a pin+cotter through the holes.
Voila, you have a hinge.
Now, is it okay if everything is galvanized? Or must you prevent galvanizing deposits on the "faying surfaces" of these plates (both sides of the spar gusset, and the inside of each padeye gussets)?
David Topete, SE
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