I need to know what type of drill bit to use to drill a 1' hole for a Thru-Hull Intake for an additional ballast pump.I am concerned about chipping the finish. I would assume you would drill it from the outside. I am looking at the WakeMAKERS.com Complete Impeller Pump Ballast Kit.
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Thread: Thru-Hull Drilling - Bit to use?
03-13-2011, 06:17 PM #1
Thru-Hull Drilling - Bit to use?07 LSV
03-13-2011, 07:27 PM #2
03-13-2011, 07:30 PM #3
Chamfer the hole as well... so u dont get chips and stress cracks..
03-13-2011, 09:10 PM #4
Thank you!07 LSV
03-17-2011, 04:46 PM #5
I used a diamond hole saw use for tile to get through the gelcoat then drilled through the rest forward with a regular wood bit much quicker
I figured if it wont chip ceramic tile it shouldn't chip the gelcoat2007 Outback V
03-17-2011, 08:48 PM #6Senior Member
- Join Date
- Jan 2008
- Pensacola, FL
Everything posted above. Use tape on the hull prior to starting, start on the outside. The drill bit will work its way through, then finish from the inside. Start both sides in reverse. Once done, use some sand paper and round (or chamfer) the edges of the gel coat, this will help prevent gel coat cracks. Measure several times, you only get one shot.1997 MasterCraft 205
2008 Moomba Outback
1999 MasterCraft Sportstar OB
1992 MasterCraft 205
1999 Malibu Response LX
1987 Marlin Magnum Skier