What is the ideal router bit size for a roundover - AVS Forum
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Old 06-11-2013, 08:00 AM - Thread Starter
 
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What is the preferred radius of a roundover bit for DIY speaker cabinets?
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Old 06-11-2013, 08:44 AM
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The most common large roundover is 3/4"
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Old 06-11-2013, 08:45 AM
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I like to use a bit with radius equal to the panel thickness.

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Old 06-11-2013, 09:06 AM - Thread Starter
 
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Quote:
Originally Posted by Jay1 View Post

The most common large roundover is 3/4"

Do you know the best bit to use pricewise? All bits that size that I have seen seem to run in the 45 dollar range! Seems a bit steep for 1 bit.
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Old 06-11-2013, 09:33 AM
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I've been liking 3/8" lately. I'm not sire there is a "Best" size anymore than preference. I also prefer Whiteside Machine bits. They're made in the USA and have the best customer service for tech questions. I've found that they also stay sharp the longest but that's based on use/user

They have a 4 piece roundover set that includes 3/4" for $95. That's less than $25 each. The 3/4" alone is $50
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Old 06-11-2013, 09:39 AM
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There's an MLCS 3/4 radius for $22.40 on Amazon. I've only ever used Freud, I've got a Bosch 3/4 that's been through many builds as well. YMMV.

-Nate
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Old 06-11-2013, 09:45 AM
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Ideal? The largest possible as it takes a pretty large roundover to help with diffraction.

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Old 06-11-2013, 09:55 AM
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Quote:
Originally Posted by robotbunny View Post

There's an MLCS 3/4 radius for $22.40 on Amazon. I've only ever used Freud, I've got a Bosch 3/4 that's been through many builds as well. YMMV.

-Nate

Yup the mlcs bit is a great deal. That's the one I have.
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Old 06-11-2013, 10:48 AM - Thread Starter
 
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yeah that mlcs bit looks nice, for some reason it costs $40.00 to ship to Canada... lol. Will have to pick it up next time I go to the states. Thanks guys.
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Old 06-11-2013, 11:08 AM
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Quote:
Originally Posted by JWagstaff View Post

yeah that mlcs bit looks nice, for some reason it costs $40.00 to ship to Canada... lol. Will have to pick it up next time I go to the states. Thanks guys.

You might give the mlcs website a shot?
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Old 06-11-2013, 11:45 AM
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Quote:
Originally Posted by JWagstaff View Post

yeah that mlcs bit looks nice, for some reason it costs $40.00 to ship to Canada...
Go to the MLCS website. Shipping options to Canada start at around $17.

Or, go to your local Lowes and buy one.
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Will have to pick it up next time I go to the states.
Why do so many Canadians think they have to buy things south of the border? Is it really that much cheaper?
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Old 06-11-2013, 11:47 AM - Thread Starter
 
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Quote:
Originally Posted by Jay1 View Post

You might give the mlcs website a shot?

16 bucks... a bit better but wow why is US to canada so expensive but not china to canada. lol. I go to the states a few times a year so it's not a big deal to just pick it up next time I go.
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Old 06-11-2013, 11:48 AM - Thread Starter
 
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Quote:
Originally Posted by Colm View Post

Go to the MLCS website. Shipping options to canada start at around $17.

Or, go to your local Lowes and buy one for about $47.
Why do so many Canadians think they have to buy things south of the border? Is it really that much cheaper?

I think you answered your own question. $47.00 from lowes, $23.00 from amazon.

Plus 13% sales tax in Canada...

and I can get all my stuff shipped in 1 package to a UPS store in the US that is 45 minutes from my house, that charges only $5.00 to hold it. So when I go I'm there anyways, so gas money is not counted, so I spend 5 bucks to get everything basically half price and virtually no tax.
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Old 06-11-2013, 11:48 AM
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^ Yup. They reccomend Global Express Mail for fast service to Canada, not sure how much though.

Jay, I've never used the MLCS bits, but those prices even for the solid carbide upspirals is NICE! Nothing stays sharp forever, but the Bosch 3/4 roudover I have has been through 12 sheets of white oak and maple ply (8ft poker tables) and it's still working well. What's your experience with the other MLCS offerings? I may switch. smile.gif

-Nate
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Old 06-11-2013, 12:01 PM
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I've only used that roundover bit, but it's been through my lcr speakers, and pair of 7 ft3 subs (all edges for all) and hasn't shown any wear. Of course, I dont use mdf
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Old 06-11-2013, 02:09 PM
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I like the 3/8" roundover on my subs and speakers. Just enough to take the edge off.

 

This is the bit I used.

http://www.amazon.com/MLCS-6354-8-Inch-Radius-Router/dp/B002SW2N26

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Old 06-11-2013, 02:45 PM
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I've always been advised to use 1" roundover if you're going to veneer. However, I've been using 3/4" roundover on my projects, but it takes a little more time and effort if you're doing the iron on method.

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Old 06-11-2013, 03:17 PM
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Quote:
Originally Posted by robotbunny View Post

What's your experience with the other MLCS offerings?
The standard MLCS bits are good bits at a reasonable price. I have lots of them. The Katana bits are about as good as anything on the market. And MLCS offers free shipping (in the USA) even on small orders.
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Old 06-12-2013, 11:32 AM
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^ Cool.Thanks for the input Colm. Saw that on the free shipping and ordering direct is the way to go. Just spent a little bit looking around the site, really great deals on bit sets and the 3rd bit is free on solid carbide upspiral sets.

-Nate
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Old 06-12-2013, 11:41 AM
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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. cool.gif My 1/8" cutting, flush trim, chamfered, and 1/2" roundover bits have built at least 8 subs and 5 speakers so far and have not shown any signs of dullness. cool.gif

I suppose that 3/4" roundover is next on my list.
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Old 06-12-2013, 11:47 AM - Thread Starter
 
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I wish there was a bit set with a 3/4" roundover.
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Old 06-12-2013, 12:10 PM
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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.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
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Old 06-12-2013, 12:17 PM - Thread Starter
 
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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.

not sure what you mean by that? less than an inch and a half doesn't do much? is this in reply to the first post or my last post?
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Old 06-12-2013, 12:20 PM
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More info please Bill. smile.gif I have been wondering about this myself. I was about to buy a larger roundover bit, but will wait for your reply.
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Old 06-12-2013, 12:24 PM - Thread Starter
 
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Does anyone have any picture examples of say 3/8" ,1/2" , 5/8" and/or 3/4" roundovers to see the difference?

edit: found some decent pics http://www.glumber.com/WoodTopSubpages/Details/EdgeTreatmentData/EdgeTreatmentSubPages/Roundovers.htm
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Old 06-12-2013, 12:26 PM
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I know Bill will explain this way better than I, but it is true. Depending on baffle width and the frequency wavelength, diffraction will happen regardless. Using a round over that large or a chamfer would essentially extend the baffle width slightly as those lower frequencies move around the speaker and thus decrease diffraction. Baffles less than ~18" or so...
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Old 06-12-2013, 12:29 PM - Thread Starter
 
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Quote:
Originally Posted by robotbunny View Post

I know Bill will explain this way better than I, but it is true. Depending on baffle width and the frequency wavelength, diffraction will happen regarless. Using a round over that large or a chamfer would essentially extend the baffle width slightly as those lower frequencies move around the speaker and thus decrease diffraction. Baffles less than ~18" or so...

oh, yes.

I am asking this question based on looks only.
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Old 06-12-2013, 12:35 PM
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Gotcha, I figured so, I thought I'd just toss that out there. smile.gif Bill will undoubtedly correct me yoda style, I think that's the jist of it though. tongue.gif
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Old 06-12-2013, 12:51 PM
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I am more interested in the interaction where a port is concerned. After I affix grills, I don't think there would be any benefit for doing roundovers on the edges of the cabinet.
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Old 06-12-2013, 01:31 PM - Thread Starter
 
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^ they look good biggrin.gif
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