B&C 8PE21 horn |
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4226 |
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I agree totally with all of the compliments above as it does seem ages since we had an epic build on here---But(theres always a but) I just had a thought that it may have been easier to make a jig and make them out of fibreglass, especially if more are going to be required in the future.
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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Quality work there!
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boots-hifi
Old Croc Joined: 15 August 2011 Status: Offline Points: 2463 |
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Maybe fibre glass would of made sense, but let’s face it if you can produce wood work at this standard its an art form. I’d love to hear them!
Edited by boots-hifi - 26 January 2019 at 12:21am |
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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Top skills, love a biscuit or two!
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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catalin
Registered User Joined: 02 April 2012 Location: London Status: Offline Points: 152 |
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Hi everyone!
Most of my knowledge abaut sound sistems is from Speakerplans Forum,important is not to rush things,be patient and know your limits Allso is important to understand what you are doing , building something without know how is working is nonsens to me And,yes,great people araund here which share their knowledge (sometimes with to much patience!) Speakerplans is the place to be!! Thank you!!
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catalin
Registered User Joined: 02 April 2012 Location: London Status: Offline Points: 152 |
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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When I made horns like this years ago, I had a lot of trouble with the calculations for the compound mitre angles on the flare pieces. I didn't get it quite right and ended up with small gaps. Could you possibly explain how you worked them out?
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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catalin
Registered User Joined: 02 April 2012 Location: London Status: Offline Points: 152 |
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Well,yes ,it is tricky,it was more like test and try
I had to sacrifice few bits of ply ,till i get it right
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bob4
Old Croc Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843 |
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One possibility is to cut slightly oversize and do the final trimming with a well tuned hand plane. You would be amazed at the amount of accuracy you get with a little bit of practice! |
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luthier
Registered User Joined: 21 July 2013 Location: UK - London Status: Offline Points: 271 |
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I often cut compound mitres with my ts55 track saw, hand planes have their place, but they're not practical time wise if you're making multiples.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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you can calculate them using trignometry and I have done so in the past. I can't quite explain it without drawing it all out though - it involves multiplying the angles by cos or sin of the flare angles. there's a calculator on this page under 'general compound angles 2' edit: for a square horn the bevel=45-(((invsin(cosAcosB))/2) how you do it for a horn with more than four sides I can't quite get my head round Edited by snowflake - 27 January 2019 at 9:23pm |
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doller
Young Croc Joined: 19 July 2014 Location: japan Status: Offline Points: 509 |
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It's near impossible with a hand circular saw. They only bevel one way and it's always the wrong way. Cutting perfect matching panels near impossible. I am sure a few can do it.
The best way is to make an angled cut off jig for the table saw. You can get exactly matching panels. But yes it does always take a bit of trial and error. |
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