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Go Back   SailNet Community > On Board > Gear & Maintenance > Gluing Pedestal Guard Feet???
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Thread: Gluing Pedestal Guard Feet??? Reply to Thread
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Topic Review (Newest First)
12-30-2012 03:02 AM
SchockT
Re: Gluing Pedestal Guard Feet???

I receives some bad advise a number of years ago an bedded my rope clutches with 5200. I developed a leak on one of them, and had to pull it to seal the leak. That is when I realized the mistake I had made using 5200 in the first place. I thought I could just peel the clutches off the deck. Yeah right! So I thought, "no problem I just need a little more force!" so I attached a halyard to one end of the clutches and used the winch to carefully lift them off the deck. They showed no signs of separating from the deck, but the cabin top was visibly flexing. I am sure that if I continued with that strategy I would have ripped a hole in the deck before the 5200 let go! That stuff is pretty much forever! The problem is, whatever load you put on it is ONLY on the top layer of the deck. If you exceed the strength of that layer you are dealing with serious damage to your deck.

Do yourself a favor: come to terms with the idea of drilling holes and through bolting your hardware. The way you describe it is certainly a good way to go about it, but if you bed it properly you don't necessarily have to go that far. Don't glue it, bolt it!
12-30-2012 02:23 AM
chef2sail
Re: Gluing Pedestal Guard Feet???

Tom,

I did this exact project 5 years ago. The pedestal guard legs insertsinto the chrome feet which have a rubber gasket and a large heavy washers and have two substantial 3-4 inch long (1/2 inch diameter bolts). You must put the washers ( I added a backing plate too) under the cockpit sole then the rubber on top of the sole then the chrome feet holder. Just gluing with 5200 will not withstand the stress of pressure you will torque the guard with either holding on to it or falling against it. The backing plate will spread the stress. In my install I actually used the tubes to lead down all my wires from the two nav pods I have which have Chartplotter and radar cables. I drilled holes for the bolts as well as for the cables. If you have core you have to gouge it out and fill with epoxy so there is no water intrusion in the core of the cockpit sole.

http://www.defender.com/product.jsp?...7548&id=128476
12-30-2012 01:14 AM
Sanduskysailor
Re: Gluing Pedestal Guard Feet???

Bad idea. Not enough bearing surface to hold and as others have stated it will tear up the gelcoat in short order. My thinking is that your pedestal and guard should be rock solid. I redid my cockpit sole, recored, and glassed a solid section for the pedestal, rudder post and pedestal guard. My pedestal and guard are now bolted through 1-1/4" of solid glass. I never worry anymore when my 275lb crew grabs the pedestal as he moves across the cockpit.
12-30-2012 12:54 AM
dacap06
Re: Gluing Pedestal Guard Feet???

Quote:
Originally Posted by paul323 View Post
Drill and bolt.

Remember the 5200 (yuk) would be glued to the paint/gelcoat. So whichever bond is weaker - 5200 to gelcoat, or gelcoat to 'glass - will fail. Drilled and bolted with good backing plate distributes the load over a much larger and stronger area.


Ha! That's it! I wouldn't be attaching directly to the fiberglass.

Stumble, I think you misunderstood what I was asking. I was discussing the glueing the feet for the chrome tubing of the pedestal guard, not the pedestal itself. The pedestal is already secured with bolts and a large backing plate. The guard is held in place by the feet and where it passes through a plate that is inserted into the pedestal assembly. the picture below shows the entire thing in the left hand part and just the guard, the plate, and the feet in the right hand part.



Now I just need to find an epoxy that can cure at low/subfreezing temperatures. If I can't I'll have to wait until Spring to do this task.

Tom
12-29-2012 11:26 PM
paul323
Re: Gluing Pedestal Guard Feet???

Drill and bolt.

Remember the 5200 (yuk) would be glued to the paint/gelcoat. So whichever bond is weaker - 5200 to gelcoat, or gelcoat to 'glass - will fail. Drilled and bolted with good backing plate distributes the load over a much larger and stronger area.

no-brainer, IMHO.
12-29-2012 10:48 PM
Rockter
Re: Gluing Pedestal Guard Feet???

Glue it and bolt it.
Don't glue it alone.
Someone will lose their balance and fall on to it in the dead of night and it will get torn off.
.
12-29-2012 06:37 PM
dsmauney
Gluing Pedestal Guard Feet???

I drilled, removed balsa, epoxy, redrilled with countersink ( ref Mainesail) and sealed with butyl. Worked great and is solid with thru bolts. Did the same for holes to feed wire through for pedistal guard instruments.

Goodwinds
DaveM
12-29-2012 06:21 PM
Stumble
Re: Gluing Pedestal Guard Feet???

I depends on the size of what you are glueing down, but the torqu loads that can be applied from a pedestal can be huge, well beyond what 5200 can handle. When you run the numbers, not much on a boat is more highly loaded than a pedestal base, and it is all torque loads, so the distance above the pivot (where it's glued) is multiplied by the force applied.

Not only do pedestals need to be bolted, they need heavy backing plates.
12-29-2012 05:48 PM
dacap06
Gluing Pedestal Guard Feet???

OK, I have something I can't get out of my head because it doesn't seem right but I can't figure out why not. Can anyone see a problem?

I have a pedestal guard I want to put on the Edson Pedestal while I'm doing my winter maintenance. Normally, that would mean drilling holes in the deck for the feet, clearing out the balsa, filling with epoxy, redrilling through the epoxy, chamfering the cut, and finally mounting the feet with butyl tape. The problem is I am loathe to drill holes in a perfectly good (and waterproof) deck, especially above my engine like this.

So I got to thinking, what if I were to glue the feet in place with 5200? No holes, no possible leaks, ever. My intuition tells me there's some disadvantage to it, but for the life of me I don't see it. Can anyone show me my blind spot?

Thanks

Tom

 
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