Ideas for building big round horns

ARIYAHOOR · 19th July 2012, 07:17 AM

I want to build a horn speaker but Stereo-lab (and other providers) won't ship to my place so I have to build them myself

I want ideas about how to build big round horn using MDF slices

any idea about 3D CNC or rotary machine which may be capable of cutting such a thing? I can't DIY a machine for this job, I have to find a guy with right machine to do this for me

I dunno about capabilities of a 3D CNC

any help is appreciated badly

rvrazvan · 19th July 2012, 07:23 AM

My cheap test

I will use fibreglass at a point in time.
inspiration from here
inlowsound.com

Tytte71 · 19th July 2012, 09:04 AM

Have you tried contacting Horns for finished horns?

If using CNC for making wood horns it would probably be cheapest and easiest to make the horns split in two parts and then glue them together. Milling or using lathe in a long narrow throath might not be feasible (depending on sizes off course).

ARIYAHOOR · 19th July 2012, 11:07 AM

Quote:

Originally Posted by Tytte71

Have you tried contacting Horns for finished horns?

If using CNC for making wood horns it would probably be cheapest and easiest to make the horns split in two parts and then glue them together. Milling or using lathe in a long narrow throath might not be feasible (depending on sizes off course).

as I come from Iran

I don't think anybody or any company would ship orders to this freakin' country

I have to do it myself. I just want to know what CNC machine is capable of routing a horn with MDF slices

Don Bunce · 19th July 2012, 02:07 PM

You don't need a CNC machine to make a horn. Cut out the circles with a router or a jig saw,glue them together,and sand down the edges.An angle grinder with 40 grit sandpaper works well. Another way is to fill in the steps with auto body filler.

round horns

ARIYAHOOR · 19th July 2012, 02:17 PM

Quote:

Originally Posted by Don Bunce

You don't need a CNC machine to make a horn. Cut out the circles with a router or a jig saw,glue them together,and sand down the edges.An angle grinder with 40 grit sandpaper works well. Another way is to fill in the steps with auto body filler.

round horns

something like this?

After spending unending hours filing, sanding and sanding some more, this is the product after priming.

Don Bunce · 19th July 2012, 03:11 PM

Yes,like that.
To make the sanding a bit easier,you can mount the horn vertically on a lazy susan,and use the angle grinder to rotate it as you sand.

ARIYAHOOR · 19th July 2012, 03:23 PM

Quote:

Originally Posted by Don Bunce

Yes,like that.
To make the sanding a bit easier,you can mount the horn vertically on a lazy susan,and use the angle grinder to rotate it as you sand.

Thanks for the clue

I think cutting circles with CNC will speed up the project.
I have another question: what is the best way to design a Tractrix round horn?

Don Bunce · 19th July 2012, 04:05 PM

Single Driver Website

green heron · 19th July 2012, 05:00 PM

Here's the approach I took:

https://sites.google.com/site/diyfir...tractrix-horns

Design is the easy part...download the spreadsheet from volvotreter's download section then graph either by hand or on the computer and print.

19th July 2012, 07:17 AM	#1
ARIYAHOOR Banned Join Date: Jun 2011 Blog Entries: 1	Ideas for building big round horns I want to build a horn speaker but Stereo-lab (and other providers) won't ship to my place so I have to build them myself I want ideas about how to build big round horn using MDF slices any idea about 3D CNC or rotary machine which may be capable of cutting such a thing? I can't DIY a machine for this job, I have to find a guy with right machine to do this for me I dunno about capabilities of a 3D CNC any help is appreciated badly

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19th July 2012, 07:23 AM	#2
rvrazvan diyAudio Member Join Date: Jul 2010	My cheap test I will use fibreglass at a point in time. inspiration from here inlowsound.com

19th July 2012, 09:04 AM	#3
Tytte71 diyAudio Member Join Date: Oct 2010	Have you tried contacting Horns for finished horns? If using CNC for making wood horns it would probably be cheapest and easiest to make the horns split in two parts and then glue them together. Milling or using lathe in a long narrow throath might not be feasible (depending on sizes off course).

19th July 2012, 02:07 PM	#5
Don Bunce diyAudio Member Join Date: Mar 2007	You don't need a CNC machine to make a horn. Cut out the circles with a router or a jig saw,glue them together,and sand down the edges.An angle grinder with 40 grit sandpaper works well. Another way is to fill in the steps with auto body filler. round horns

19th July 2012, 03:11 PM	#7
Don Bunce diyAudio Member Join Date: Mar 2007	Yes,like that. To make the sanding a bit easier,you can mount the horn vertically on a lazy susan,and use the angle grinder to rotate it as you sand.

19th July 2012, 04:05 PM	#9
Don Bunce diyAudio Member Join Date: Mar 2007	Single Driver Website

19th July 2012, 05:00 PM	#10
green heron diyAudio Member Join Date: Oct 2007 Location: Chicago	Here's the approach I took: https://sites.google.com/site/diyfir...tractrix-horns Design is the easy part...download the spreadsheet from volvotreter's download section then graph either by hand or on the computer and print.