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03-05-2022, 21:27
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#1
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Registered User
Join Date: Jul 2014
Location: Florida
Posts: 141
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Cutting G10
Picked up a couple of G10 sheets from my local plastics shop that I'm going to use for backing plates. However I didn't realize how tough it is. Looking at some older posts looks like folks were cutting it with either a circular saw, or a band saw, and my only cutting tools are an oscillating multi-tool and a dremel. Can I cut this stuff with the right blade with either of these tools? Or should I invest in something a little more heavy duty? TIA
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03-05-2022, 23:42
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#2
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Registered User
Join Date: Oct 2008
Boat: Custom cutter, 42'
Posts: 701
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Re: Cutting G10
Buy a decent saw, a circular if you're making straight cuts or a sabre of there's a lot of curves. You've got a big boat, you need some decent tools.
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04-05-2022, 02:59
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#3
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Marine Service Provider
Join Date: Dec 2010
Location: Little Compton, RI
Boat: Cape George 31
Posts: 2,977
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Re: Cutting G10
There are grit-edged blades available for the multi-tool, but you'll weary yourself trying to make long straight cuts with that. I'd invest in a nice saber saw (Bosch is my fav right now) and get some grit blades meant for cutting tile.
__________________
Ben
zartmancruising.com
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04-05-2022, 03:27
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#4
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,138
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Re: Cutting G10
The dust from G10 is very fine, stays airborne for a long time after working it, and is very irritating to mucous membranes (eyes, nose, mouth, throat, lungs), so use a good dust and particulate mask, or better yet, a respirator, when working it. Wet cutting (tiles saw) might also be a good idea.
A good quality bi-metalic saw will work. If you use a circular saw, use carbide tip blades, go slow, and expect the carbide blade to wear out quickly.
You can also use a, grinder with a [metal] cut off wheel.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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04-05-2022, 05:24
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#5
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Registered User
Join Date: Mar 2012
Location: Baltimore, MD
Boat: 39' Custom built junk rigged cat ketch
Posts: 510
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Re: Cutting G10
If you don't want to buy a power tool, a hack saw with a bi-metalic blade will do the trick faster and straighter than the multi tool or Dremel.
Sent from my Z5157V using Cruisers Sailing Forum mobile app
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04-05-2022, 06:21
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#6
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Registered User
Join Date: Sep 2020
Location: Boston area
Boat: 1969 Frers custom, 39.5ft Sloop
Posts: 47
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Re: Cutting G10
If a straight cut, then a table saw or circular saw. For odd shapes, I'm using Bosch Carbide tooth blades (not the grit kind) in a saber saw. It's slow going, but very precise and the teeth are still sharp after many backing plates. The blade cost $11 for one at Lowes, so not cheap, but still going after my bi-metal blades got dull. If you have to make a tight turn, go wide and then clean up the edge - too tight will cause too much friction and can break the teeth - carbide stays sharp, but is brittle.
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04-05-2022, 07:02
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#7
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Registered User
Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 3,169
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Re: Cutting G10
Quote:
Originally Posted by jimp1234
Picked up a couple of G10 sheets from my local plastics shop that I'm going to use for backing plates. However I didn't realize how tough it is. Looking at some older posts looks like folks were cutting it with either a circular saw, or a band saw, and my only cutting tools are an oscillating multi-tool and a dremel. Can I cut this stuff with the right blade with either of these tools? Or should I invest in something a little more heavy duty? TIA
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When I bought a 4X8 sheet of GPO1 for a project I made templates out of rosin paper and the GPO1 supplier used a water jet to cut everything to size for me. Then it was only necessary for me to do minor trimming for a perfect fit. Your supplier may also offer the same service….it can save loads of time and the necessity to purchase specialized tools and blades.
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04-05-2022, 07:09
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#8
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Registered User
Join Date: Jan 2018
Boat: 50ft Custom Fast Catamaran
Posts: 11,832
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Re: Cutting G10
The best way to cut any type of pre-fabricated fiberglass panel is with a saws all.
Cuts through it like butter. The large teeth on the blade make all the difference in the world.
This is of course, assuming you are not trying to create a circular cut.
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04-05-2022, 09:21
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#9
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Registered User
Join Date: Jan 2019
Location: Minnesota, USA
Boat: 21' trailer sailor & 8' sailing dinghy
Posts: 1,742
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Re: Cutting G10
Quote:
Originally Posted by Orion Jim
When I bought a 4X8 sheet of GPO1 for a project I made templates out of rosin paper and the GPO1 supplier used a water jet to cut everything to size for me. Then it was only necessary for me to do minor trimming for a perfect fit. Your supplier may also offer the same service….it can save loads of time and the necessity to purchase specialized tools and blades.
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Did they scan in the rosin templates? Having many pieces water-jet or CNC routed makes sense for a larger project.
I have had good results with carbide tools in general and higher quality blades for the oscillating multi-tool. The regular HSS blades for multi-tools will wear quickly in GRP products.
__________________
Big dreams, small boats...
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04-05-2022, 10:07
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#10
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Registered User
Join Date: Dec 2008
Location: Noank, Ct. USA
Boat: Cape Dory 31
Posts: 3,169
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Re: Cutting G10
Quote:
Originally Posted by Spot
Did they scan in the rosin templates? Having many pieces water-jet or CNC routed makes sense for a larger project.
I have had good results with carbide tools in general and higher quality blades for the oscillating multi-tool. The regular HSS blades for multi-tools will wear quickly in GRP products.
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Yes, that allowed them to position them optimally to make the most efficient use of their equipment and use the least amount of material. The company makes the NOAA data buoys that are anchored offshore and lots of other stuff they won’t discuss for the Navy.
That material is so dense and stranded that even carbide tools must be babied to get a clean cut. With a water jet it cuts precisely with no rough edges.
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04-05-2022, 16:09
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#11
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Registered User
Join Date: May 2012
Location: Richmond CA
Boat: Freedom 40
Posts: 229
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Re: Cutting G10
Quote:
Originally Posted by GordMay
The dust from G10 is very fine, stays airborne for a long time after working it, and is very irritating to mucous membranes (eyes, nose, mouth, throat, lungs), so use a good dust and particulate mask, or better yet, a respirator, when working it. Wet cutting (tiles saw) might also be a good idea.
A good quality bi-metalic saw will work. If you use a circular saw, use carbide tip blades, go slow, and expect the carbide blade to wear out quickly.
You can also use a, grinder with a [metal] cut off wheel.
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I second the tile saw or wet cutting in general.
__________________
Erik
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04-05-2022, 16:24
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#12
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Registered User
Join Date: Jul 2007
Location: Toronto, Canada
Boat: Luders 33 - hull 23
Posts: 1,787
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Re: Cutting G10
Quote:
Originally Posted by SVQuestOfPaget
If a straight cut, then a table saw or circular saw. For odd shapes, I'm using Bosch Carbide tooth blades (not the grit kind) in a saber saw. It's slow going, but very precise and the teeth are still sharp after many backing plates. The blade cost $11 for one at Lowes, so not cheap, but still going after my bi-metal blades got dull. If you have to make a tight turn, go wide and then clean up the edge - too tight will cause too much friction and can break the teeth - carbide stays sharp, but is brittle.
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The best way to a perfect cut is to use a jigsaw with a Bosch blade.
The T141 cuts thru G10 like butter, that is the one I used to cut my backing plates.
https://www.boschtools.com/ca/en/bos...41hm1-29813-p/
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