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  #1  
Old 02-06-2020, 12:18 PM
wolfcj1 wolfcj1 is offline
 
Join Date: Aug 2014
Location: Tacoma, WA
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Default Best way to cut/trim fiberglass fairings?

Replacing cracked main wheel fairings on RV-12 with fairings from Vans. KAI says to trim fairings to scribe line to widen wheel opening with "sheers". The material to is too thick for me to cut with hand sheers. Would appreciate recommendations on how to best cut through/trim this material.
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Old 02-06-2020, 12:35 PM
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fl-mike fl-mike is offline
 
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Dremel or die grinder with abrasive cutoff wheel.
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Old 02-06-2020, 12:45 PM
scsmith scsmith is offline
 
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In addition to abrasive cut-off wheels, Dremel also makes small diamond wheels. We find those work best for trimming composite in our shop. With either type, go slow so you don't burn the resin. Start with a shallow cut, then finish with a full depth cut.
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  #4  
Old 02-06-2020, 12:49 PM
RV10Pilot RV10Pilot is offline
 
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Location: Medford, NJ USA
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Dremel works. Perma Grit disc is the best, but for your one off use any of the dremel discs.

Or my prefered method is using a vibrating multi tool, cuts like butter and I find easier to control than the rotating disc.
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Old 02-06-2020, 01:59 PM
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Bob Martin Bob Martin is offline
 
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Location: Charlottesville, Virginia
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Quote:
Originally Posted by RV10Pilot View Post
Dremel works. Perma Grit disc is the best, but for your one off use any of the dremel discs.

Or my prefered method is using a vibrating multi tool, cuts like butter and I find easier to control than the rotating disc.
Sounds like a great idea.....have to steal this idea!! SMILE
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Old 02-06-2020, 02:59 PM
12vaitor 12vaitor is offline
 
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Location: Panama City, FL
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+1 on the oscillating multi-tool, its the first tool I reach for when trimming composite materials. The circular blade seem to work best for me from a cut control standpoint.

John Salak
RV12 N896HS
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Old 02-06-2020, 03:46 PM
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snopercod snopercod is offline
 
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Back in the "olden days" when I built my Lancair kit. I used "rotary scissors" to trim the parts. That worked great, but I don't think you can buy them any more. These days I use a Structered Carbide Dremel tool like this one: https://www.dremel.com/en_US/product...e-cutter-taper
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Old 02-06-2020, 04:10 PM
DanNiendorff DanNiendorff is offline
 
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Location: Knoxville, TN
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Quote:
Originally Posted by 12vaitor View Post
+1 on the oscillating multi-tool, its the first tool I reach for when trimming composite materials. The circular blade seem to work best for me from a cut control standpoint.

John Salak
RV12 N896HS
Also, the oscillating tool makes WAY WAY less dust and mess. #1 tool for cutting fiberglass in my book.
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Old 02-06-2020, 04:39 PM
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wjb wjb is offline
 
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Location: Half Moon Bay, CA
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Quote:
Originally Posted by RV10Pilot View Post
Dremel works. Perma Grit disc is the best, but for your one off use any of the dremel discs.

Or my prefered method is using a vibrating multi tool, cuts like butter and I find easier to control than the rotating disc.
No a fan of the permanent-grit disks; they seem to be unbalanced when I spin them. Dremel has a series of fast change reinforced disk that work well. The smaller, all ceramic disks work but are quite fragile.
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  #10  
Old 02-06-2020, 04:51 PM
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N941WR N941WR is offline
 
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Use black electrical tape to mark your cut line. It stretches and conforms to odd shapes but gives a good line to follow.
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