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Old 10th September 2011, 08:12 PM   #1
jmar is offline jmar  United States
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Default Router bit?

Has anyone ever seen a specialty router bit for routing the inset edge on a speaker? (So that it will lay flush with the baffle).

I've made circle jigs and a straight or mortise bit to do it in the past, but it sure would be nice if something existed that has a roller on the bottom like a trim bit.

Obviously the roller would have to be a smaller diameter than the bit itself so the bit would cut into the material.

Such an animal exist?

Thanks.
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Old 10th September 2011, 08:17 PM   #2
jmar is offline jmar  United States
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You know what? -- did some further searching.

A rabbeting bit ! Wasn't thinking.
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Old 11th September 2011, 05:32 AM   #3
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The guide bearings on many (not all) rabbeting, flush-trim, and slot bits can be exchanged for a bearing with larger or smaller O.D. This allows you to cut a wider or narrower "shelf" as needed. Some of the router-bit vendors will even sell a kit containing several bearing sizes

(My apologies if you already know this; folks who are new to routers may find it useful if they stumble across this thread.)

Dale
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Old 11th September 2011, 12:04 PM   #4
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Quote:
Originally Posted by jmar View Post
Has anyone ever seen a specialty router bit for routing the inset edge on a speaker? (So that it will lay flush with the baffle).

I've made circle jigs and a straight or mortise bit to do it in the past, but it sure would be nice if something existed that has a roller on the bottom like a trim bit.

Obviously the roller would have to be a smaller diameter than the bit itself so the bit would cut into the material.

Such an animal exist?

Thanks.
Use a micro-fence or equivalent circle jig with your router.
Cut a wide, flat groove first (multi-pass), then cut the hole last (deeper cut).

Circle Jig Attachment Use w/ Edge-Guide - CJA - Micro Fence -

Regards,

WHG
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Old 11th September 2011, 12:37 PM   #5
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MLCS Slot Cutter Router Bits and Stackable Slot Cutter Set
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Old 12th September 2011, 01:31 AM   #6
chrish is offline chrish  Australia
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Quote:
Originally Posted by whgeiger View Post
Use a micro-fence or equivalent circle jig with your router.
Cut a wide, flat groove first (multi-pass), then cut the hole last (deeper cut).

Circle Jig Attachment Use w/ Edge-Guide - CJA - Micro Fence -

Regards,

WHG
I have built many speakers, and this is the best method in my opinion.
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Old 12th September 2011, 02:33 AM   #7
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Remember you'll need ~4" diameter (or smaller) for tweeters. That puts the center pin under the baseplate of many routers. Some adaptation is required.
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Old 12th September 2011, 07:56 AM   #8
creutz is offline creutz  United States
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Depending on what router you have, you should be able to make a separate base plate for your router if you need a smaller diamater cut. I've done it both for my Milwaukee and a craftman router and it works great. Then you can just drill holes in your "new" baseplate and use a small drill bit or a nail for a center pin. A piece of plywood or MDF works great for a baseplate ..
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Old 13th September 2011, 08:38 AM   #9
chrish is offline chrish  Australia
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I use a Jasper circle jig. Works great, no problem making holes for tweeters with diameter smaller than base plate. Jasper Circle Jigs
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Old 13th September 2011, 10:38 AM   #10
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Nobody seems to have noticed, but the cutter bit I linked to in message #5 of this thread will cut up to a 3/8" wide lip up to 1/4" deep around an existing hole. Just FYI
Doc
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