Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-02-2011, 12:48   #1
Registered User

Join Date: Apr 2009
Posts: 583
Best Tool for Cutting Fiberglass Deck ?

Do you have any experience of cutting a fiberglass balsa cored deck using a power tool? (MaineSail maybe?) I am about to re-core my deck on a 34 foot TrueNorth, about 50% needs doing. I am planning to cut to within a inch or two of the cabin and gunwale. Currently I am thinking of a small circular saw such as the Matika 4200. I don't think a router is up to the job. But if you have any suggestions I would appreciate reading about them.
Baz
__________________

__________________
bazzer is offline   Reply With Quote
Old 07-02-2011, 12:52   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: Nov 2005
Location: Tasmania
Boat: VandeStadt IOR 40' - Insatiable
Posts: 2,132
Images: 83
You can buy router bits specifically for fiberglass. I have used one on my fibreglass / kevlar deck with no problems. I have also used an angle grinder with an appropriate cutting blade.
__________________

__________________
Weyalan is online now   Reply With Quote
Old 07-02-2011, 12:58   #3
Registered User
 
Mark1977's Avatar

Join Date: Oct 2010
Location: Halifax, N.S Canada
Boat: Tanzer 26, Walk22
Posts: 864
Sawsall with a multi purpose blade...
__________________
Mark1977 is online now   Reply With Quote
Old 07-02-2011, 13:00   #4
Commercial User
 
Mark Johnson's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: New Bern NC
Boat: Searunner 34 Trimaran
Posts: 1,484
If you are going to recore the deck you want a narrow straight cut, so that when you lower that top half back down, the scar at the connect up which will show a bit, will look best.

For this, I think I would get the smallest blade version of a battery powered circular panel saw. (wear eye and lung protection). After you (preferably vacuum bag) back down the deck's top half, and fill the cut gap, I would dish out a 1" wide swath over the cut, and lay in perhaps two layers of glass tape, then fair it out... M.
__________________
Mark Johnson is online now   Reply With Quote
Old 07-02-2011, 13:03   #5
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 3,174
I've re-cored a cockpit sole using a circular saw to cut out the surface of the deck. I'd buy a cheapo for this, as I wouldn't expect it to survive more than this job.
__________________
Sailmonkey is offline   Reply With Quote
Old 07-02-2011, 13:05   #6
Registered User

Join Date: Apr 2009
Posts: 583
Quote:
Originally Posted by Weyalan View Post
You can buy router bits specifically for fiberglass. I have used one on my fibreglass / kevlar deck with no problems. I have also used an angle grinder with an appropriate cutting blade.
Thanks for the reply, any chance of being more specific on the router bit and angle grinder blade?
Thanks Mate
Baz
__________________
bazzer is offline   Reply With Quote
Old 07-02-2011, 13:12   #7
Registered User
 
Catamount's Avatar

Join Date: Jul 2005
Location: Keene, NH
Boat: Island Yachts Peterson 34 GREYHAWK
Posts: 370
Assuming you're just trying to cut the top skin, and not all the way through the deck, you'll want a tool where you can set the depth of cut -- a circular saw works well, but is restricted to more or less straight cuts. I have used an angle grinder with an abrasive cutting blade, something like what might be used for cutting metal, but they don't work as well as the circular saw because they're harder to control. A router or roto-zip type of tool should work, but my experience using them in this application is limited.
__________________
Tim Allen
My Boat Projects and Sailing Stories
Sailors for the Sea, a new voice for ocean conservation
Catamount is offline   Reply With Quote
Old 07-02-2011, 13:18   #8
Registered User
 
capn_billl's Avatar

Join Date: Aug 2010
Location: Houston,Tx
Boat: Aquarius 23'
Posts: 1,554
I've used all three. Whatever you use buy a few spare blades. I would only use the rotozip for smaller cuts.
__________________
capn_billl is offline   Reply With Quote
Old 07-02-2011, 13:45   #9
Registered User

Join Date: Feb 2011
Posts: 165
I've done that job with a skill saw and it worked great.
__________________
foamcore is offline   Reply With Quote
Old 07-02-2011, 13:48   #10
Registered User

Join Date: Sep 2009
Location: On the Gorge waterway in the heart of Victoria, British Columbia.
Boat: Explorer 44 by Stan Huntingford. Building in progress.
Posts: 30
I also assume you are talking about taking one skin of the laminate off. I have worked beside a boat builder that uses some basic tools this type of work. For straight cuts on a laminate he has a circular saw that he made up himself. I am sure you could buy one, since he tends to make something rather than buy it, but his version has a 4 inch very thick carbide blade mounted on a smaller angle grinder. It has a cover and foot plate that is adjustable. This heavier blade has no problem chopping through the glass and it gets within an inch of an obstruction. Regular woodworking carbide blades dull up very quickly.

If you want to cut right through the deck then the sawsall fitted with a long carbide blade cuts through it like butter.

For fine grinding intricate crevaces a carbide bit in an air tool at times is worth its weight in gold. Tools can be round or square on the end. Much like router bits but built for the job and they don't dull easily.

Regular fairing you would use the small angle grinder with two thickness of sanding pads for stiffness.

The rotzip tool will work, but from y experience the blade will last a few inches before it dulls.

It shouldn't be too difficult to remove one side of the layup by cutting parallel strips then pulling them off by pound a large wedge/chissel between the core and the glass.

Remember to seal the new core with a hot mix of goop so it kick quickly. A slow kick will allow the catalyst to leech out into the wood and possible prevent a good reaction in the resin. On foam cores this may result in a softening of the foam.

Good Luck

BB
__________________
Bruce Bevan is offline   Reply With Quote
Old 07-02-2011, 13:54   #11
Registered User

Join Date: May 2010
Location: Sydney Australia
Boat: Fisher pilothouse sloop 32'
Posts: 296
Quote:
Originally Posted by bazzer View Post
Do you have any experience of cutting a fiberglass balsa cored deck using a power tool? (MaineSail maybe?) I am about to re-core my deck on a 34 foot TrueNorth, about 50% needs doing. I am planning to cut to within a inch or two of the cabin and gunwale. Currently I am thinking of a small circular saw such as the Matika 4200. I don't think a router is up to the job. But if you have any suggestions I would appreciate reading about them.
Baz
Diamond blade on a small angle grinder works well AND lasts the distance. I use the continuous blade, not a segmented one.
__________________
Rob aka Uncle Bob Sydney Australia.

Life is 10% the cards you are dealt, 90% how you play em
Uncle Bob is online now   Reply With Quote
Old 07-02-2011, 14:05   #12
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 3,571
Bazzer,

Take a look at my post under Teak Deck Removal, in the construction forum. It may help you.
Once you get past the apprehension, it not that difficult a job
You can cut curves with a Skilsaw. Make your first cut not much deeper the a score mark, used as a guide for your thru cut. I cut thru about 130 ft of 1/4" glass with one 60 tooth carbide tip blade.
If you are going to bevel both edges of the cut, and reglass, then a wider cut will give you a 3-point bond back to the core.
__________________
I never did anything that didn't seem like a good idea at the time.
Blue Stocking is offline   Reply With Quote
Old 07-02-2011, 14:07   #13
Registered User

Join Date: Nov 2008
Location: Nevis, WI
Boat: Corbin 39, 'Pinguescence'
Posts: 23
Harbor freight tool's knock off of the fein multimaster is good where precision is paramount, but the expensive blades and short lifespan of same would suggest using something like an angle grinder with a heavy carbide saw blade. I have used a dremel tool to do this kind of work, but it is far to labor intensive and the little motor generally packs up on the first day! Good luck!
__________________
cgaskell is offline   Reply With Quote
Old 07-02-2011, 14:14   #14
Registered User
 
atoll's Avatar

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,signet20,prout snowgoose 37 elite catamaran!
Posts: 7,191
Images: 75
best to use composite blades,available from bosch for jig saws.

also composite circular saw blades are available for cutting grp.

find thin steel cutting discs work well for straight cuts on grp with a small disck grinder,.

uk site but will help you identify what you need the correct blades last a long time as opposed to normal blades will burn out very quickly:

Introduction to Composite Cutting - diamond blades, diamond saws - tools for cutting glass reinforced material and carbon fibre.
__________________
latest project http://www.cruisersforum.com/forums/...ml#post1235049
atoll is offline   Reply With Quote
Old 07-02-2011, 14:39   #15
Registered User
 
nv5l's Avatar

Join Date: Dec 2010
Location: Liveaboard
Boat: Allied Luders 33, Hull 98, 1971
Posts: 393
Images: 1
I'd stick with a skill saw, or worm drive, with the appropriate blade. I did mine with a worm drive and like the fact that they are thinner and allow you to get much closer to the edge you want to cut. Also, if you're right handed, you'll be looking at the blade as you cut, instead of having to look over the saw to see it. The trade off is that they're heavier and usually more bit more expensive, but well worth it.

Also, be careful not to cut too deep, especially if you wonder beyond the cored area. Otherwise you'll have a lot more work on you hands. That's where skill saws really come in handy, since you can set the depth of the blade and don't have to worry about cutting too deep and going all the way through. Routers also share this feature, but won't allow you to get as close to the edges, e.g., toerail, coachroof, etc...
__________________

__________________
don
NV5L
S/V Aurora
nv5l is offline   Reply With Quote
Reply

Tags
fiberglass

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cutting My Fiberglass Fuel Tank zds Construction, Maintenance & Refit 7 07-02-2011 13:25
Joining Hull-to-Deck Joint Permanently with Fiberglass Redbeard33 Construction, Maintenance & Refit 7 10-09-2010 17:39
Fiberglass Hull with Wood Deck? PreppieNerd Monohull Sailboats 12 05-10-2009 12:27
Cutting a hole in my deck hatch Waterborn Monohull Sailboats 15 26-04-2009 20:11
teak oil on fiberglass deck turkish6 Construction, Maintenance & Refit 0 25-08-2008 23:00


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 18:17.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Sailing News Delivered to your Email!

Stay up-to-date with the latest cruising news.

unsusbcribe at anytime with one click

Close [X]


ShowCase vBulletin Plugins by Drive Thru Online, Inc.