Best method for enlarging existing hole in hardwood flooring


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Old 12-05-13, 04:47 AM
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Best method for enlarging existing hole in hardwood flooring

Hi guys, my house has a hardwood flooring throughout the first floor. In the living room it has a gas fireplace with a floor valve. The floor valve is missing its floor plate and is apparently broken, so I bought a new valve to replace it.

A problem I noticed is that the neck on the floor plate of the new valve is 1" OD, whereas the existing hole in the floor appears to be about 3/4" ID. So I need to enlarge this hole but I really don't want to tear up the floor doing so. I have a 1" spade bit but I'm pretty sure that would splinter up the wood pretty badly, and they're really almost useless for enlarging existing holes anyway. Are there any other alternatives?
 
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Old 12-05-13, 04:53 AM
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You can try using a 1" hole saw.



Carefully center it and gently begin to drill thru.
 
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Old 12-05-13, 04:57 AM
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Norm's pic doesn't show it but there is a drill bit in the center or a hole saw. That helps to guide the saw so it won't wander. You might want to tack a piece of wood [or plywood] over the hole to help guide the hole saw. It shouldn't be a big deal to use colored putty to hide the nail holes.
 
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Old 12-05-13, 05:00 AM
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Hole Saw

Use a hole saw as suggested. Use the hole saw first to cut a hole in a piece of 1/2 in. plywood or OSB. Center this over the existing hole to use as a guide for the hole saw. Otherwise, the hole saw will "walk" as you begin the cut since the centering bit does not have wood to bite into.

Oops. Mark posted while I was typing.
 
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Old 12-05-13, 05:06 AM
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Thanks, marksr and Wirepuller, I kind of assumed the OP would know that. My bad. If he'd known that he most propbaly not needed our input.
 
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Old 12-05-13, 05:06 AM
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Or if you have access below the floor you could just screw a scrap piece of wood to the subflooring to temporarily act as a guide for the 1/4 pilot drill.
 
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Old 12-05-13, 05:11 AM
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Cutting Larger Hole

Or if you have access below the floor you could just screw a scrap piece of wood to the subflooring to temporarily act as a guide for the 1/4 pilot drill.
If you cut from the under side, the saw will "blow out" on the finished floor above.
 
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Old 12-06-13, 09:52 AM
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Thanks guys, that is a good idea...and I do havea hole saw set, I forgot all about those!
 
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Old 12-06-13, 04:25 PM
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You need a center for whatever bit you use. The holesaw will be the best, I think. Take scrap piece of wood and cut a small square piece that you can bang into the existing hole. You want it sized so the corners dig into the round hole and keep it in place.
 
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Old 12-06-13, 04:32 PM
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I would be inclined to use a Forstner Bit. You will get a much smoother finished hole. They cut a lot smoother and have guide lips around the edges that keep it aligned straight and true. Hole saws are for rough cuts in framing.
 
 

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