Square cut corners with Router?

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Forum topic by ACW3 posted 1632 days ago 7418 views 0 times favorited 12 replies Add to Favorites Watch
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2 posts in 1632 days

1632 days ago

Not familiar with a router, but I am told this is the tool I need to use for the job.
I’m needing to cut a rectangular opening in my 3/4 inch hardwood floors that will enable me to put in some flush mount wooden floor vent covers. These will rest on the subfloor that is currently under the hardwood flooring. My question is this, can I get good sharp corners by using a router? If so, what kind of bit do I need ? Hopefully this makes sense.

12 replies so far

View richgreer's profile


4522 posts in 1706 days

#1 posted 1632 days ago

You cannot get sharp corners with just a router. You will need to finish the job with a sharp chisel. There are some chisels made specifically for this, but any chisel that is small enough to fit in the opening can probably do the job.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View botanist's profile


150 posts in 2170 days

#2 posted 1632 days ago

I don’t think that’s possible with a router because it has a spinning bit that would leave corners rounded, regardless of the size or type of bit. You could rough-out the hole in the floor with the router and then square off the corners with a chisel. You could use a standard chisel or one made for cutting square corners.

View Andrew's profile


709 posts in 1830 days

#3 posted 1632 days ago

No, you can not get square corners from the router, no matter how small of a bit you you they will still be slightly rounded. However I think it is the best tool for the job. You can square the corners using a jig saw, chisels, or hand saws, that is pretty easy to do. I have a jigsaw, and it is really hard to cut straight lines for any distance over 5 inches ( probably just a lack of skill). With a router you can set up guides and the bit will not wander the way a jigsaw blade will.
Hope this helps.

-- Even a broken clock is right twice a day, unless, it moves at half speed like ....-As the Saw Turns

View John Ormsby's profile

John Ormsby

1279 posts in 2369 days

#4 posted 1632 days ago

You MUST also think about the possibility of hitting a hidden nail that might be in the floor. You can use a metal detector first to verify the area is free of nails. You can then make a template for the router and secure it to the floor with double sided tape. Just clean up the inside corners with a chisel. Do a test cut with the template to make sure it is accurate.

-- Oldworld, Fair Oaks, Ca

View ACW3's profile


2 posts in 1632 days

#5 posted 1632 days ago

Thanks guys! Great advice and very helpful! Really appreicate it.

View PurpLev's profile


8476 posts in 2280 days

#6 posted 1632 days ago

another thing to consider – is the vent cover perefctly square on it’s corners? or are the corners slightly rounded – if they ARE rounded, than you need to use a bit with the same radius as the corners.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View SnowyRiver's profile


51451 posts in 2112 days

#7 posted 1632 days ago

Depending on how close to the wall the opening is, it probably would work easier to just use jigsaw.

-- Wayne - Plymouth MN

View Bob #2's profile

Bob #2

3808 posts in 2653 days

#8 posted 1632 days ago

Fein Multimaster is designed for this.
Rent one if this is your only job.

-- A mind, like a home, is furnished by its owner

View DaddyZ's profile


2381 posts in 1672 days

#9 posted 1632 days ago

If using a router, Make a jig don’t freehand for straighter lines

-- Pat - Worker of Wood, Collector of Tools, Father of one

View stefang's profile


12938 posts in 1966 days

#10 posted 1632 days ago

Bosch makes a multimaster type of tool and it about half the price with the same features. Bosch makes good tools.

-- Mike, an American living in Norway.

View Abbott's profile


2570 posts in 1936 days

#11 posted 1632 days ago

Bosch makes a multimaster type of tool and it about half the price with the same features. Bosch makes good tools.

That’s what I was thinking as well. Cut it out with a skillsaw and then the jig saw use to be the only choice. If you take a multi-tool with you it will help make the chore a snap.

-- Ohh mann...pancakes and boobies...I'll bet that's what Heaven is like! ♣ ♣ ♣ ♣

View Ger21's profile


622 posts in 1763 days

#12 posted 1631 days ago

Harbor Freight has the same type tool for $30, if you only need it for 1 job.

-- Gerry,

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