Chamfering speaker holes

[ludespeedny]

What do you usually do to chamfer the back of the speaker holes? Is there a specific bit you prefer to use?

[Wolf]

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:


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.


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


Hope that hekps,
Wolf

[martyv]

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

[mattsk8]

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]

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

We have one. We should rent it out
Mark

[Wolf]

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]

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]

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.

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