What is the ideal router bit size for a roundover - Page 2 - AVS Forum
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post #31 of 38 Old 06-12-2013, 01:42 PM
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Quote:
Originally Posted by JWagstaff View Post

What bit should I get from the MLCS website that would just be used to cut out driver holes and countersink them in a baffle? or what 2 bits?

 

1/4 spiral upcut

#5157 or #5146

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post #32 of 38 Old 06-12-2013, 01:43 PM
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I use a Jasper jig and a full carbide 1/4", 1/4" shank upspiral. My last build though, I cut my woofer recess by first going 0.25" deep all the way around with the upspiral bit and then changed to a 3/4", 1/2" shank straight plunge cut bit (adjusting the Jasper jig to the bit size) and mowed through the rest of it in about 60 seconds. Baffle done. The straight bit is a real go-to workhorse bit in my box-o-bits. smile.gif
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post #33 of 38 Old 06-12-2013, 07:40 PM
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Quote:
Originally Posted by Gorilla83 View Post

I have at least 15 of the MLCS bits so far - of the 10 or so I've used, they haven't let me down.

I just tried their 1 1/2: radius bit for the 1st time; it also worked well, in a table mounted router and lowish speed.

It's so big I couldn't use an onsert ring, and makes quite the whirring sound.
Quote:
Originally Posted by Bill Fitzmaurice View Post

3/8" is the standard for commercial corner protectors. Where edge diffraction is concerned less than about an inch and a half radius doesn't do much, if anything.

Isn't that overly general?

Wouldn't a smaller radius do for a tweeter what a larger radius would for a mid/woofer?

Noah
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post #34 of 38 Old 06-12-2013, 08:08 PM
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Quote:
Originally Posted by JWagstaff View Post

I wish there was a bit set with a 3/4" roundover.

There is. Whiteside Machine. 1/4, 3/8, 1/2, &3/4 about $95
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post #35 of 38 Old 06-12-2013, 08:20 PM
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Not sure how well you guys can see this, but it's a comparison showing the effects on a "typical" TM sized speaker. 8" x 16" baffle with a 1" tweeter centered 4" from the top.

From 0 radius to 1.25" radius in 1/4" increments


Note that the very large roundovers start to change the effects below 3 khz, which is where the crossover is typically found. If the speaker was designed with little or no edge treatment you actually could make things worse using a huge roundover, depending on the design.
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post #36 of 38 Old 06-12-2013, 08:22 PM
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Quote:
Originally Posted by JWagstaff View Post

I wish there was a bit set with a 3/4" roundover.

There is. Whiteside Machine. 1/4, 3/8, 1/2, &3/4 about $95

Here ya go free shipping but don't know about Canada

http://www.hartvilletool.com/product/3323/roundover-router-bits
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post #37 of 38 Old 06-13-2013, 06:42 AM - Thread Starter
 
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Quote:
Originally Posted by JohnDean View Post

There is. Whiteside Machine. 1/4, 3/8, 1/2, &3/4 about $95

I meant one with a bunch of general bits. Like MLCS 15 piece that's only 40 bucks but it comes with 3/8" roundover.
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post #38 of 38 Old 06-13-2013, 09:03 AM
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Agreed Jay. It does depend on the design. One can see the amplitude rise as the radius changes and also when the driver directivity changes. That's a good simulation you've provided, it also helps to see this relationship to have save overlay "on" at zero radius. wink.gif

-Nate
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