Cutting Circles

shanahan · 17th June 2004, 05:41 AM

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!

blu_line · 17th June 2004, 05:49 AM

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

shanahan · 17th June 2004, 06:01 AM

Could you please explain to me what your jig looks like/ how it works? Thanks

Mikey p · 17th June 2004, 06:11 AM

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.

Hybrid fourdoor · 17th June 2004, 06:12 AM

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 RotoZip™? 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.

nuppe · 17th June 2004, 06:15 AM

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

blu_line · 17th June 2004, 08:11 AM

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

Hybrid fourdoor · 17th June 2004, 08:35 AM

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

Andy G · 17th June 2004, 12:12 PM

.. hope it helps...

jonz · 17th June 2004, 12:27 PM

Does anybody have an oversize view of a Jasper Circle cutting jig?

17th June 2004, 05:41 AM	#1
shanahan diyAudio Member Join Date: Apr 2004 Location: Arizona	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! __________________ Red pill or blue pill....hmmm red for the Redwings and blue for the Blues Brothers...take both and have purple for...for...hey Neo wait up you, which one did you take eh?

17th June 2004, 06:01 AM	#3
shanahan diyAudio Member Join Date: Apr 2004 Location: Arizona	your jig Could you please explain to me what your jig looks like/ how it works? Thanks __________________ Red pill or blue pill....hmmm red for the Redwings and blue for the Blues Brothers...take both and have purple for...for...hey Neo wait up you, which one did you take eh?

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17th June 2004, 05:49 AM	#2
blu_line diyAudio Member Join Date: Jan 2002 Location: The Netherlands	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

17th June 2004, 06:11 AM	#4
Mikey p diyAudio Member Join Date: Feb 2004 Location: Sask. Canada	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.

17th June 2004, 06:15 AM	#6
nuppe diyAudio Member Join Date: Aug 2003 Location: Gothenburg	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

17th June 2004, 08:11 AM	#7
blu_line diyAudio Member Join Date: Jan 2002 Location: The Netherlands	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

17th June 2004, 12:27 PM	#10
jonz diyAudio Member Join Date: Mar 2004 Location: Montreal	Does anybody have an oversize view of a Jasper Circle cutting jig?