Cutting holes in fiberglass
03-12-2003, 07:42 PM
#16
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Location: charlotte Mi
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I need to open the thru transom holes up from 3" to 4"....will a 4" hole saw go thru 2" of transom?....also is the way to do that is to use a piece of wood across the inside of the transom for the center drill bit in the hole-saw to hold it centered?....Fred
03-12-2003, 08:08 PM
#17
Fred use a 3 inch hole saw to cut a plug to put in the existing hole to allow a center so that you can cut the bigger hole. The 3 inch plug will center the pilot bit if you tack it into the existing 3 inch hole. If you need to cut a deep hole just drill untill it wont go any deeper and then break out what you have cut so far and then go at it again untill the hole is done.
HINT-- start the hole on both sides so that the fiberglass doesn't shread on the inside of the transom.
HINT-- start the hole on both sides so that the fiberglass doesn't shread on the inside of the transom.
03-14-2003, 07:15 PM
#19
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Use a 3 inch holesaw mounted backwards inside a 4 inch holesaw using a 1/4 inch long bolt to replace the pilot drill. The 3 inch saw will then become the pilot. Be sure to use the appropriate size. Sometimes it's 4-1/16 or 4-1/8 outside diameter of pipe. Use wax or some other lube on the pilot and the cutter.
