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Paper Horn constuction
Paper Horn constuction
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Old 25th February 2018, 07:36 PM   #11
Pano is offline Pano  United States
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Paper Horn constuction
I like the idea of wax or shellac and the quick dry. I made a pair of papier mâché horns from 100% cotton heavy art paper and wall-paper glue. Took forever for each layer to dry. Sounded amazingly good, tho.
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Old 25th February 2018, 08:55 PM   #12
silverprout is offline silverprout  France
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Quote:
Originally Posted by PRR View Post

How many sides? An awful lot of the old horns have 11 sides. There may have been a published pattern for this; or it may have been a standard at some company. Mystic Numerics will suggest other numbers for Divine Properties. Being atheist, I will note that our circular approximation gets poor at 4 sides (however math it as a square and the same approach is perfect). At silverprout's 7 sides, I'd call the pi math perfect for any practical purpose (you *will* scale your horn a bit bigger than your actual passband).
11 sides seems to be a good approximation IMHO, grandaddy was right.
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Originally Posted by Pano View Post
I like the idea of wax or shellac and the quick dry. I made a pair of papier mâché horns from 100% cotton heavy art paper and wall-paper glue. Took forever for each layer to dry. Sounded amazingly good, tho.
The unpressed version of the "champagne jeroboam hom generator prototype" is 4mm thickness, dry completely within 8 hours and have enough rigidity to avoid any doping.
One polymer textile layer really accelerate the drying process, i must thanks the womens feet.
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Last edited by silverprout; 25th February 2018 at 09:10 PM.
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Old 26th February 2018, 11:28 AM   #13
Pano is offline Pano  United States
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Paper Horn constuction
That's pretty.

BTW, thanks for the horn plot with and without the paraffin. It has quite an effect at the low end.
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Old 26th February 2018, 05:25 PM   #14
DonVK is online now DonVK  Canada
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How are the CD's attached. Is there a reusable threaded piece or flange added ?
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Old 26th February 2018, 06:14 PM   #15
silverprout is offline silverprout  France
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Originally Posted by DonVK View Post
How are the CD's attached. Is there a reusable threaded piece or flange added ?
Flange added (laser cut plywood) pieces are entering the mass production phase, i will produce a lot of horns !
The first one will be the HOM generator that gives a huge resonance of 10 dB at 1000 Hz
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Old 26th February 2018, 06:39 PM   #16
DonVK is online now DonVK  Canada
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I was thinking of a pipe fitting for a screw on CD. Both could be reused on the next horn. Since the horns are paper they could be recycled as well.

I do enjoy the pleasing sound of a resonant 1Khz tone. Maybe I could make a paper "ear trumpet" so that I'll be able to hear it as well.
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Old 26th February 2018, 06:59 PM   #17
silverprout is offline silverprout  France
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The threading process is too complex and the junction to the horn will be severely degraded on good designs (if it happens )
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Old 26th February 2018, 07:20 PM   #18
DonVK is online now DonVK  Canada
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I'll be very interested in how you attach that flange. I'm looking forward to more pics and results.
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Old 26th February 2018, 11:14 PM   #19
mkane77g is offline mkane77g  United States
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Paper Horn constuction
way more complicated shape than I can duplicate with wood. There fantastic looking and I wish I had a way to duplicate them. No CAD software here or a printer large enough.
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Old 27th February 2018, 08:28 PM   #20
silverprout is offline silverprout  France
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I know that you are impatient to see my flange attach... so here is my last creation :

The SHREDDER !
Click the image to open in full size.
ouch....
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