Reply by sandt38

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Posted on Cutting a circle with my router?

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166 posts in 2903 days

#1 posted 06-11-2010 04:05 PM

JJohnston has the real deal. The Jasper Jig is very nice, and one many speaker builders like to use. But TBH I like to go to my buddy’s house and use his circle cutter drill bit for holes up to 7 inches. you can find one just as nice at Harbor Freight for a lot less. While the router jig, both my home made one and the Jasper jig, work well, they do leave a little room for error when you reach the end of the cut, which is why I recommended going 1/2 way through the workpiece, taping it and flipping it over and finishing the cut. The center pivot point will not move as much, or as abruptly as the portion you are resting your router in will not fall through to the floor, which can throw off the end of your cut. I guess I should add that when I cut the second 1/2 of the hole, I place it firmly, and flat on my workbench.

Of note, I am a speaker builder and I do cut a lot of holes. I just have a few jigs made for specific size subwoofers, and use the drill bit for my smaller ones, like midrange and smaller midbass drivers, and forstner bits for most tweeters, of course using the circle cutter bit for some odd sized tweets.

Just some food for thought.

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