Could this bending method applied to a larger cabinet?

Foxx510 · 10th April 2007, 08:48 AM

I like the way Zaph has created these bends using slits, just wondering if it would work in an 80liter cabinet with 25mm MDF, with a 320mm front baffle tapering down to a roughly 260mm rear width. Has anyone tried this?

AMV8 · 10th April 2007, 11:34 AM

Hi

Cutting grooves into the wood is a traditional method of bending wood. It is even used in ship timbers - so no concern over size. The problem is that the cut area is very weak. The only way I know of making it strong again is to cut the wood, make sure it bends as required, then fill the cuts with a wood glue and hold in shape until set.

Don

Geoff H · 10th April 2007, 01:31 PM

Yep, if you want to see a sample, try the auto shops. The so called sub boxes are made the same way, for economic reasons. A gang or multiblade saw cuts all the groves in one sweep. Then cut that panel into several sections after cutting the speaker holes. Bend to shape and glue in the ends. Takes about 40 seconds on the production line to convert panels to raw boxes.

zigzagflux · 10th April 2007, 02:46 PM

I believe that is called kerf bending. For a very impressive construction, take a look at this:

http://www.audiotropic.net/Projects/speakers.html

Geoff H · 10th April 2007, 10:00 PM

Nice link. I see the cuts or kerfs are on the inside. That could be stronger, and less work in finishing the exterior. Geoff.

Foxx510 · 10th April 2007, 10:07 PM

Looks like good option, I'm just wondering how sharp a radius I can get on 25mm MDF. I think I might be pushing the laws of physics to do what I want. I might have to experiment with some scraps. The boxes in the link are really really nice!

Geoff H · 10th April 2007, 10:41 PM

Judging on what is being discussed in other places, sharp radii may not be a good thing, due to edge diffraction. It may change your idea about MDF.
http://www.diyaudio.com/forums/showt...threadid=98969

Geoff

Foxx510 · 10th April 2007, 10:50 PM

The bends would be at the back actually. I'm thinking of a trapezoidal shaped cabinet of about 80liters, with rounded corners at the rear. The front will be a fairly traditional flat baffle with rounded off edges using a router.

10th April 2007, 08:48 AM	#1
Foxx510 diyAudio Member Join Date: Nov 2006	Could this bending method applied to a larger cabinet? I like the way Zaph has created these bends using slits, just wondering if it would work in an 80liter cabinet with 25mm MDF, with a 320mm front baffle tapering down to a roughly 260mm rear width. Has anyone tried this?

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10th April 2007, 11:34 AM	#2
AMV8 diyAudio Member Join Date: Jan 2005 Location: near london	Hi Cutting grooves into the wood is a traditional method of bending wood. It is even used in ship timbers - so no concern over size. The problem is that the cut area is very weak. The only way I know of making it strong again is to cut the wood, make sure it bends as required, then fill the cuts with a wood glue and hold in shape until set. Don

10th April 2007, 01:31 PM	#3
Geoff H diyAudio Member Join Date: Oct 2006	Yep, if you want to see a sample, try the auto shops. The so called sub boxes are made the same way, for economic reasons. A gang or multiblade saw cuts all the groves in one sweep. Then cut that panel into several sections after cutting the speaker holes. Bend to shape and glue in the ends. Takes about 40 seconds on the production line to convert panels to raw boxes.

10th April 2007, 02:46 PM	#4
zigzagflux diyAudio Member Join Date: Oct 2006	I believe that is called kerf bending. For a very impressive construction, take a look at this: http://www.audiotropic.net/Projects/speakers.html

10th April 2007, 10:00 PM	#5
Geoff H diyAudio Member Join Date: Oct 2006	Nice link. I see the cuts or kerfs are on the inside. That could be stronger, and less work in finishing the exterior. Geoff.

10th April 2007, 10:07 PM	#6
Foxx510 diyAudio Member Join Date: Nov 2006	Looks like good option, I'm just wondering how sharp a radius I can get on 25mm MDF. I think I might be pushing the laws of physics to do what I want. I might have to experiment with some scraps. The boxes in the link are really really nice!

10th April 2007, 10:41 PM	#7
Geoff H diyAudio Member Join Date: Oct 2006	Judging on what is being discussed in other places, sharp radii may not be a good thing, due to edge diffraction. It may change your idea about MDF. http://www.diyaudio.com/forums/showt...threadid=98969 Geoff

10th April 2007, 10:50 PM	#8
Foxx510 diyAudio Member Join Date: Nov 2006	The bends would be at the back actually. I'm thinking of a trapezoidal shaped cabinet of about 80liters, with rounded corners at the rear. The front will be a fairly traditional flat baffle with rounded off edges using a router.

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