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Old 17th June 2004, 05:41 AM   #1
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Default Cutting Circles

Can anyone explain to me how to cut perfect circles for a speaker in wood? I've heard that a dremel type rotary tool is not the best for finish work, and that the blades aren't the best. A plunge router was suggested. I have used this style of router before but in a decorative application. So could someone please explain to me how to use a plunge router to cut perfect speaker holes? Or if you have another method I'd love to hear it! Thanks!
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Old 17th June 2004, 05:49 AM   #2
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I have used a router to do cut-out circles.
I even managed to make a 5 mm ring of 10cm in diameter of 4 mm thick MDF.

I used a DIY Jig that i bolt onto the router. The jig determines the radius of the circle.

grtz

Simon
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Old 17th June 2004, 06:01 AM   #3
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Default your jig

Could you please explain to me what your jig looks like/ how it works? Thanks
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Old 17th June 2004, 06:11 AM   #4
Mikey p is offline Mikey p  Canada
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You can make one cheaply out of 1/4 inch hardboard.
http://www.woodworkingtips.com/etips/etip102000sn.html
This design uses a bolt for a pivot pin, I used a 1 1/4 inch finishing nail with greater accuracy.
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Old 17th June 2004, 06:12 AM   #5
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Default Re: Cutting Circles

Quote:
Originally posted by shanahan
I've heard that a dremel type rotary tool is not the best for finish work, and that the blades aren't the best.
Are you talking about a RotoZipô? I've seen poeple have good success with those, using the circle attachment.

For larger holes, I just use a Hand Held Scroll Saw, probably not the best. For smaller holes (<5") I use a hole saw, which is a round saw blade that attaches to an electric drill. Usually you can iterchange the hole onto the bit. They usually cut perfect holes, but your limited to more standard sizes, as you won't find something like a 3 3/16, only 3 1/4.
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Old 17th June 2004, 06:15 AM   #6
nuppe is offline nuppe  Sweden
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I've also made a jig, i posted mine here.

I know, it looks like hell, but it works really great.
I think you can see how it works by the pictures, i'll be happy to answer if you have any questions.

regards
/Andreas
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Old 17th June 2004, 08:11 AM   #7
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I used the one Mike put in his message.
Can be used for circles, rings and cut-outs (so speaker are flat with the baffle).

grtz

Simon
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Old 17th June 2004, 08:35 AM   #8
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Quote:
Originally posted by Mikey p
You can make one cheaply out of 1/4 inch hardboard.
http://www.woodworkingtips.com/etips/etip102000sn.html
This design uses a bolt for a pivot pin, I used a 1 1/4 inch finishing nail with greater accuracy.

Good read, especially for a young newb like me!

http://www.woodworkingtips.com/etips/index.html
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Old 17th June 2004, 12:12 PM   #9
Andy G is offline Andy G  Australia
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Default here's a pic for you....

.. hope it helps...
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File Type: jpg router.jpg (12.3 KB, 139 views)
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Old 17th June 2004, 12:27 PM   #10
jonz is offline jonz  Canada
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Does anybody have an oversize view of a Jasper Circle cutting jig?
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