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 Bits for cutting fiberglass		  New Topic  Topic Locked
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OJ
Master Marine Consultant

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USA
4382 Posts
Initially Posted - 01/07/2002 :  13:56:58  Show Profile
Getting my ducks in order to convert to-hulls to thru-hulls. The thru-hulls I purchased are the flush-mounts which require you to cut a recess for the flange. Anyone ever find a grinding bit that stands up reasonably well to fiberglass? Or am I better
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 01/07/2002 :  15:08:51  Show Profile  Visit Leon Sisson's Homepage
Steve,

I also installed the flush head thru-hulls. I started by using a hole saw to make the straight cut for the bronze thru-hull threads. Then to cut the "countersink", I used a 4" disk on a Makita right-angle grinder to rough in the taper. I then
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JD van Wyhe
Deckhand

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22 Posts
Response Posted - 01/07/2002 :  15:13:12  Show Profile
Steve,
When I did mine, I used a router with a 45 degree chamfer bit; one with a pilot bearing. Cut the glass like butter. To be on the safe side, I think I cut a shallow bevel to start, then progressively deeper with each pass. Leaves a very smooth a
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.