SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > cutting board as backing plate material?
 Not a Member? 


Thread: cutting board as backing plate material? Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
12-08-2011 01:47 PM
pdqaltair
Quote:
Originally Posted by BELLATRIX1965 View Post
Can anybody recommend a good source for G10 plate? Preferably about 5/8" thick, and maybe about 12" by 12" size? Just need a backing plate for an anchor windlass - not a full sheet of the stuff!
What is the basis for the thickness? If it is stiffer an stronger than the deck layup, it is wasted. Given the limits of the windlass, deck, and chain, I seriously doubt anything over 1/4-inch will have value to you, but some simple engineering calculations would tell. Additionally, bonding it to the deck will greatly decrease the required thickness, as the deck and plate will act as a unit. If the plate doesn't conform to the curve of deck, the load distribution is haphazard.

Really, the load on the windlass should not be great if a proper chain stopper is used. That is where the big snatch loads are.
12-07-2011 09:37 AM
Maine Sail
Quote:
Originally Posted by BELLATRIX1965 View Post
Can anybody recommend a good source for G10 plate? Preferably about 5/8" thick, and maybe about 12" by 12" size? Just need a backing plate for an anchor windlass - not a full sheet of the stuff!
McMaster Carr has smaller sheets and does stock 5/8".. Don't know about 12X12, pretty sure they do offer it, but I have bought 12X24 a number of times..
12-07-2011 09:32 AM
BELLATRIX1965 Can anybody recommend a good source for G10 plate? Preferably about 5/8" thick, and maybe about 12" by 12" size? Just need a backing plate for an anchor windlass - not a full sheet of the stuff!
12-07-2011 09:01 AM
Maine Sail Any of the HDPE products lack the stability to prevent flex and properly "back", unless VERY thick. The ability for anything, even 5200, to stick to them for long is what really makes them a poor choice though..

I had a customer use 3/4" HDPE for backing plates, Sea Board (same as Starboard) and in one season 3 out of 7 were known to be leaking. They provided no support and the flexing when turning the handles cause the seal to leak.

A small batch of boat builders tried this over the years, mostly small power boat builders, and I suspect also ran into problems. At the last boat show I did not see any of them using it for backing blocks any more, even ones I'd recalled seeing in the past... HDPE is very flexible and you might as well be trying to bed a Teflon frying pan, sealant wise... Nothing really stocks to it...

Leave the cutting boards in the galley and use known time tested and proven methods below water to keep your boat from sinking or leaking...


Of course you don't need to take my advice here's what the manufacturer says:

"King StarBoard®, King StarBoard® ST, King ColorCore®, King ColorBoard® and King CuttingBoard® can not be glued using standard adhesives. Products like 3M’s 5200 work well as a water sealing caulk but will not adhere King StarBoard® to itself or other materials in a permanent bond."
12-07-2011 08:29 AM
jacob30 McMaster Carr sells a 12"x 12" 3/4" thick fiberglass sheet for $30. I just used it for my backing plates. So far worked great. Search GPO3 for the part.
12-07-2011 12:22 AM
mitiempo I partially agree with the above - plywood is better than solid wood. But the backing plate, whatever it is made of, should be on the underside of the deck, not the liner as there is a gap between the liner and the deck. Tightening the bolts will move the liner closer to the deck. I would try to get the backing block right under the deck.

As far as epoxying the backing block to the deck, or the inside of the hull in the case of a through hull, I think it is the best idea as it will become part of the hull or deck, strengthening it a great deal.

For through hull installation, see this link: Replacing Thru-Hulls and Seacocks Photo Gallery by Compass Marine at pbase.com

And fiberglass or G10 is ideal. What I do is save any fiberglass scraps I remove from any boat - mine or others as I work on boats - and cut backers from them for my use. Any boatbuilder should have offcuts as well, probably free for the asking.

Example here
12-07-2011 12:05 AM
sfchallenger I wouldn't use cutting board, or any other plastic, for a backer plate. Plywood is easy to work and lasts a pretty long time.

Solid stock is not a good idea if you are considering using wood. The cross lamination of the grain in plywood is preferred, it won't split and doesn't have internal tension like a piece of oak. I use 3/4" marine ply for through-hulls and I soak them in Smith's epoxy at least twice. I wouldn't epoxy to the hull, as the washer will be removed when the thru-hull is next replaced. Hopefully after I don't own the boat anymore.
12-06-2011 11:47 PM
asdf38 I'm about to add backing plates myself. G10 was recommended and it certainly makes sense but I was thinking about hardwood oak for convenience and cost. Home depot sells 0.5"x6"x4' for $13 that would make several plates. Also in my boat many of these backing plates would be visible and stained oak would blend in nicely.

How much advantage is there to epoxying to the hull? I don't like permanently attaching anything and second, I think I have an interior liner that would make this less useful?
04-09-2011 07:08 PM
Baywind I got a used SS sheet that was a toe kick off a door at a building for free. I cut it with my grinder and then sand the edges smooth and corners round. It is tough to drill the holes but it is strong and looks good.
04-09-2011 07:38 AM
DonScribner Cutting boards are usually HDPE (High Density PolyEthylene). If you are interested in using a plastic, use UHMW (Ultra High Molecular Weight polyethylene). It's more expensive but still affordable in the sizes that you would require. We shim skylights weighing many tons with the stuff. It is available, among other places, at McMasterCarr.com
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 09:50 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.