Support for the DIY speaker builder

 
ludespeedny
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Posts: 5
Joined: Tue Sep 10, 2013 10:38 am

Chamfering speaker holes

Fri Sep 13, 2013 10:11 am

What do you usually do to chamfer the back of the speaker holes? Is there a specific bit you prefer to use?
 
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Wolf
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Joined: Mon Feb 20, 2012 7:36 pm
Location: Indiana
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Re: Chamfering speaker holes

Sat Sep 14, 2013 3:53 pm

Depends on the driver. If there is not much window for driver breathing in the basket of the driver, then I prefer a 1/2" R cove bit. If the magnet gets in the way of breathing in a thicker baffle, then maybe a cove plus 45* chamfer to finish it off.
For some drivers a 3/4" roundover is enough, and 8" drivers are more typically don't require the relief.

This is a 1/2" cove followed by 45* chamfer, and the driver was a 4.5" with very little basket breathing room:
Image

This is a 1.5" baffle combined with limited breathing room. I used a 1/2" cove, then flush trimmed to the cove relief, and then rounded over the inner edge with a 3/4" radius.
Image

This is just a cove bit between the screw-mounts as it's traditionally done:
Image

Hope that hekps,
Wolf
 
martyv
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Joined: Mon Mar 10, 2014 9:16 pm

Re: Chamfering speaker holes

Mon Mar 10, 2014 10:32 pm

Man! I wish I knew that before I assembled my first cabinet. This could be detailed or explained better in the drawings for the Mini-Statements I'm building right now. I'll have to find a way to add the relief bevels with the baffle installed. I'll probably use a trim router and free hand it.
Martin
 
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mattsk8
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Joined: Wed Jan 02, 2013 12:03 pm
Location: Michigan

Re: Chamfering speaker holes

Tue Mar 11, 2014 2:36 pm

martyv wrote:
Man! I wish I knew that before I assembled my first cabinet. This could be detailed or explained better in the drawings for the Mini-Statements I'm building right now. I'll have to find a way to add the relief bevels with the baffle installed. I'll probably use a trim router and free hand it.
Martin


A dremel would work w/ a carving bit for freehand removal, then fine tune w/ a file to smooth it out.
 
meniscus
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Re: Chamfering speaker holes

Wed Mar 12, 2014 5:16 pm

These are not cheap, but work well http://www.routerbitworld.com/Freud-85- ... 85-384.htm

We have one. We should rent it out :D
Mark
 
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Wolf
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Location: Indiana
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Re: Chamfering speaker holes

Thu Mar 13, 2014 4:05 am

Yeah- I priced those Freuds when I went looking, and they are about $80 each. MLCS carries a 1/2" round-under bit in a 1/4" shaft for about $20. I haven't used it yet, but I have one. What I want is a cove-under!

Wolf
 
johngalt47
Posts: 6
Joined: Tue Nov 12, 2013 8:22 pm

Re: Chamfering speaker holes

Sat Mar 22, 2014 9:56 am

Last year Woodcraft had one (or one like it) on sale for 50% off! Needless to say I scarfed it up in a heartbeat.
 
Jim Holtz
Posts: 39
Joined: Sat Jun 15, 2013 12:40 am

Re: Chamfering speaker holes

Sun Mar 23, 2014 11:32 am

I'm not a great cabinet builder by any stretch of the imagination but they're good enough that the wife lets me bring them in the house. :lol:

I used to use 45 degree bits etc. and finally just started using a 3/4" round-over bit on the inner baffle to allow the drivers to breath. It works well and I've not had any issues with screws coming loose from lack of material to bite into.

HTH

Jim

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