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Boat Forum / Cruising / June 2005Making a big hole bigger...a tip
I'm replacing my knotmeter with a new unit. The hitch is that the old sensor required a 1 3/4" hole in the hull, but the new sensor requires a 2" hole. Ever try to use a hole saw without something for the pilot drill to bite into? Very difficult, and certain to make gouge marks where you'd prefer there be none..:) My solution was to nest a 1 3/4" hole saw with the 2" hole saw. The smaller hole saw now becomes the "guide" for the larger. After well started, the inner hole saw is removed. Worked perfectly. I bet I'm the only person in the world who didn't know this trick, but just in case not, I thought I'd pass it along. Norm B Use a hole saw to make a wood plug slightly smaller than your existing hole. Tack it into place with hot melt glue and then cut your new hole with the appropriate hole saw using the center hole in the plug as your starting guide. Go easy at first until the track for the new hole is well established. Clever! > Use a hole saw to make a wood plug slightly smaller than your existing > hole. Tack it into place with hot melt glue and then cut your new hole > with the appropriate hole saw using the center hole in the plug as your > starting guide. Go easy at first until the track for the new hole is > well established. Necessity is the mother of clever... :-) Here's a rather nifty tool made especially for the purpose, it's billed as the "Oops" hole saw arbor: http://www.rockler.com/findit.cfm?cookietest=1&sid=V5760&page=11383 > Necessity is the mother of clever... > > :-) > Here's a rather nifty tool made especially for the purpose, it's billed as > the "Oops" hole saw arbor: > > http://www.rockler.com/findit.cfm?cookietest=1&sid=V5760&page=11383 Nice.  SignatureBob La Londe http://www.YumaBassMan.com Exactly what Engsol described. > Here's a rather nifty tool made especially for the purpose, it's billed as > the "Oops" hole saw arbor: [quoted text clipped - 4 lines] >> >> :-) > Ever try to use a hole saw without something for the pilot drill to > bite into? Very difficult, and certain to make gouge marks where > you'd prefer there be none..:) Use the hole saw to cut a 2" hole in a block of wood. Place the 2" hole firmly over the place you want to cut the 2" hole in the panel, over the smaller hole. While firmly holding the wood block where you want it, with clamps if you can get them to clamp it hard, the block will guide the hole saw, keeping it centered over where it should be from the outside around the hole saw blade as you press inward to make the new cut with your wood- block-hole-saw-guide you made. SignatureLarry You know you've had a rough night when you wake up and you're outlined in chalk. Norm Great tip. Thanks Ditto for all the others Matt > I'm replacing my knotmeter with a new unit. The hitch is that the > old sensor required a 1 3/4" hole in the hull, but the new sensor [quoted text clipped - 11 lines] > just in case not, I thought I'd pass it along. > Norm B > I'm replacing my knotmeter with a new unit. The hitch is that the > old sensor required a 1 3/4" hole in the hull, but the new sensor [quoted text clipped - 11 lines] > just in case not, I thought I'd pass it along. > Norm B Not sure of the exact nature of the body of material you were drilling, but I have often had to redrill or saw hut a hole that is offset fromt he original hole. I simpley cut a plug to fit the hole and glued it in place. Then after it was set I redrilled the hole. Your trick of nesting a saw within a saw is one I have never heard of before, but it makes perfect sense. I will try and remember that one, because I have had to increase the size of a knockout hole in an electrical communications J-Box in the past. Your trick would work perfectly for this application. SignatureBob La Londe http://www.YumaBassMan.com > I'm replacing my knotmeter with a new unit. The hitch is that the old > sensor required a 1 3/4" hole in the hull, but the new sensor > requires a 2" hole. > <snip> My solution was to nest a 1 3/4" hole saw with the 2" hole > saw. Nice idea if you have that type of hole saw. I tap a wood plug into place and drill through. That works better for me as I use the carbide-bit-on-an-arm type of hole saw: The one does all sizes of holes and takes no space since it lives in the drill's hard case. SignatureJere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
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