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  1. #1
    Join Date
    Oct 2010
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    Winnipeg, Manitoba
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    362

    Default Make hole in hull bigger

    Any pointers on this before I plug in the drill? I don't want to chip or crack anything.



    I need to bore out the hole the speaker wires are in. I need it big enough for some sort of rubber sleeve for the wires.
    Last edited by rsinger; 04-30-2012 at 10:00 PM.
    past---------------2003 Outback SOLD
    present------------2006 Supra Launch 21V
    possible future-----2013 Mojo

    Ron

  2. #2
    Join Date
    Jun 2007
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    Vancouver, WA
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    Default

    How much bigger do you need/want to go? You may be able to get away with just a shrink wrap type tubing cover over the wires instead of a loom or bulky sleeve and then not have to open it up that much at all.

    Normally you tape over it really good and if using a hole saw, some run it backwards to cut through the gelcoat, then flip the switch and finish off the hole. But since you've already got the hole I'm wondering if you could get away with using a step drill bit. Just not sure how gentle that would be on the gelcoat, even with tape on it...
    Old enough to know better, young enough to do it anyway.

    2001 MobiusV

  3. #3
    Join Date
    Aug 2010
    Location
    Acworth, GA
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    Default

    Perhaps one of these would work?

    http://www.iboats.com/Seachoice-Cabl...-view_id.21303

    If not then that looks like it is about a 3/8 hole already. But to be sure what size is the existing hole? You can pickup many size drill bits at Lowes or Home Depot. So if the existing hole si say 3/8 and you want to nudge it up a touch buy a 1/2 bit and run it in reverse to enlarge the existing hole. I'd then hit it gently with a step (conical) bit in reverse to taper the gelcoat a bit.
    Last edited by KSmith; 05-01-2012 at 07:29 AM.
    Kraig - 2010 Outback V

  4. #4
    Join Date
    Jun 2008
    Location
    De Pere WI
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    4,104

    Default

    looks like theres enough room to squeeze some wire loom in that. I'd run loom and leave it if it was mine.

    but to the original question, I'd probably use a dremel very slowly with tape across the whole area and a green metal stone bit on it.
    '06 Supra Launch 20SSV-gone but never forgotten

  5. #5
    Join Date
    Aug 2010
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    Acworth, GA
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    Default

    Indeed if you just wanted the wires cleaned up some I like this braided sleeving and secure the ends with heat shrink tubing.

    http://www.parts-express.com/pe/show...number=082-360
    Kraig - 2010 Outback V

  6. #6
    Join Date
    May 2009
    Location
    Carlton Oregon
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    5,967

    Default

    My advise is if you only need it slightly bigger use a file, or get the small bits with the sandpaper on them. The same as you would see on a Drimmel. If you need it larger then you can use a larger drill bit, run it in reverse. I would not run it forward at all with a pre drilled hole that size, it will grab and gripe and try to chunk out the gell.
    Last edited by mmandley; 05-01-2012 at 04:47 PM.
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  7. #7
    Join Date
    Jan 2008
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    get a round file with fine teeth and mount on the drill and slowly work the hole til it is open enough.
    A Day at the Lake...Priceless
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    Joe V
    2012 Möbius XLV~ Loaded & Exiled
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  8. #8
    Join Date
    Oct 2010
    Location
    Winnipeg, Manitoba
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    Default

    Quote Originally Posted by mmandley View Post
    I would not run it forward at all with a pre drilled hole that size, it will grab and gripe and try to chunk out the gell.
    That was my worry. I think I'm going with KSmiths idea, with a twist.
    1. Start with what he suggested. I think we've got some of this stuff with our videoconference group. About a foot and a half. I've got some heat shrink at home.

    2. I've already got some ribbed plastic wrap. I'll use this as a "water proof" cover.

    3. I'll ream out the hole with an air grinder, big enough to fit the ribbed plastic wrap into the hole and silicone closed. Might get a little dusty, but no gouges/chips on the surface.

    Thanks for all the input.
    past---------------2003 Outback SOLD
    present------------2006 Supra Launch 21V
    possible future-----2013 Mojo

    Ron

  9. #9
    Join Date
    Jun 2012
    Location
    Portland Oregon
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    Not that you need to go with a hole saw but if you ever do and you have a pre existing hole use a piece of 3/4" plywood with the new hole drilled in it. Simply hold the plywood over the old hole and drill the new one. I was able to drill all five of my courtesy lights larger with no help since I could rest the plywood on my floor. To drill my five vent holes bigger I held the plywood and had a friend drill. All holes need to be filed after drilling or cracks will appear in your gel coat.
    -Jake

  10. #10
    Join Date
    Aug 2008
    Location
    Cottage Grove, MN
    Posts
    736

    Default

    stick an appropriate sized cork in the hole for the hole saw center bit to bite on. I did this when inlarging my drain ports to 1". Worked like a charm.
    2006 Outback V - Gone
    2008 LSV - Gone
    2013 other brand

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