Need help reading blue prints for wood horns. - Page 3 - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 29th January 2013, 06:43 AM   #21
diyAudio Member
 
djmeverett's Avatar
 
Join Date: Dec 2011
Location: Washington
Quote:
Originally Posted by djn View Post
Hi All. I just bought a wood lathe and want to build a pair of 1Khz Yuichi horns. On the blue print there is a center line that is ticed off at some increment but I can't figure out what the increment means.

See the pic below. The increment starts at 4 and ends at 16. I've been reading blue prints for years and have never seen where a segment is not marked for length.
That AK-1 is one cool looking horn assembly!.....I don't think a wood lathe will be of much use building those top and bottom laminated blocks though.
They will need to be cut, shaped and contoured by hand. The top and bottom blocks are going in two directions (compound).
All units of measure are in mm unless otherwise noted.....the only otherwise note is the thickness of the side blocks in cm (4cm) or 40mm.
The radius origin point is not really on the paper as it's a vanishing point and is located 34mm down from the STA mark 6 at the throat entrance.
Each STA mark is 10mm.
If you measure from the throat entrance starting at the 6 mark (zero) the 16 mark is 34mm+100mm=134mm.
This type of drawing is very common in ship building and is done in the "lofting" fashion in order to depict compound curves.
It's sometimes better to only show a half section with these though rather than the full section as shown....a matter of preference as they are mirror.

So in the one view at STA 16 the "loft" (or curvature) is 104mm from the center line and in the other direction the loft (curve) is 35. You need point points to get the compound curve correct. You need to use a "french" or "lead" curve to layout the actual curve between points they are not straight lines as someone depicted in the staircase step drawing.
This is an analog horn made of wood not a digital one!!...LOL
  Reply With Quote
Old 29th January 2013, 08:00 PM   #22
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
I've built tractrix horns with the lathe. It actually work very well and out of one disc I get 4 horn halves which is enough to build two horns.

I think that little red dip in your drawing shows the picture might not be accurate, but I'm not sure there should be a dip there either.
__________________
My "Art" website http://home.comcast.net/~djnagle/site/
  Reply With Quote
Old 29th January 2013, 08:02 PM   #23
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Quote:
Originally Posted by planet10 View Post
The centre/origin of the arcs are at 2.6 cm on the vertical axis, 14mm below the opening.

dave
To my mind Dave, that would be the center of the disc.
__________________
My "Art" website http://home.comcast.net/~djnagle/site/
  Reply With Quote
Old 29th January 2013, 08:23 PM   #24
diyAudio Member
 
djmeverett's Avatar
 
Join Date: Dec 2011
Location: Washington
Quote:
Originally Posted by djn View Post
I've built tractrix horns with the lathe. It actually work very well and out of one disc I get 4 horn halves which is enough to build two horns.

I think that little red dip in your drawing shows the picture might not be accurate, but I'm not sure there should be a dip there either.
OK...I think I see your use of the lathe
So what your planning would be a solid block of wood roughly 260mm in diameter and 150mm deep and then turn that on a lathe similar to gouging a bowl but working from the center base outward to the flare creating the horn shape?....correct?
Then you would cut that into quarters and then fabricate the end plates and throat adapters...2 horns!
That would be interesting and a cool way of doing it!
Would you need to bore a hole into the center of the block first?
That would be a fun video to watch!
  Reply With Quote
Old 29th January 2013, 08:35 PM   #25
diyAudio Member
 
djmeverett's Avatar
 
Join Date: Dec 2011
Location: Washington
Question:
Wouldn't you actually do two blocks one with the curve on sheet 1 (top and bottom) and then the second block for the end plates on sheet 2?
  Reply With Quote
Old 29th January 2013, 08:58 PM   #26
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Yes, that is how we did it before. I don't bore a hole in the center because I need that wood to hold this all up while turning. I will turn the top and bottom but in this case I will cut the curved sides on the band saw.

Here are pix of the 250hz tractrix horns will had turned by the guy who is now teaching me how to turn.

I am starting out with the 1Khz horns out of plywood just to get the process down.
Attached Images
File Type: jpg DSC03021.jpg (257.5 KB, 63 views)
File Type: jpg downsize.jpg (40.4 KB, 59 views)
File Type: jpg downsize_2.jpg (38.3 KB, 56 views)
File Type: jpg DSC03023.JPG (779.7 KB, 57 views)
__________________
My "Art" website http://home.comcast.net/~djnagle/site/
  Reply With Quote
Old 29th January 2013, 09:30 PM   #27
diyAudio Member
 
djmeverett's Avatar
 
Join Date: Dec 2011
Location: Washington
Got ya!....a band saw would be a great way to do those!
Those are very nice horns you have there!
What are the black pieces?...are they also shaped wood?
  Reply With Quote
Old 29th January 2013, 09:31 PM   #28
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by djn View Post
Here are pix of the 250hz tractrix horns will had turned by the guy who is now teaching me how to turn.
Those horns are pretty!

A smooth throat to horn transition really makes a difference in frequency response and reduction of diffraction effects.
The horn would sound better if you make the throat square smaller than 1", and file it out in a smooth round to square transition, like Hughes' "quadratic throat".

Having compared the difference, found it was not subtle to my ears or measurement. Takes a long time filing, but compared to all the other lathing and sanding, probably not much by comparison.

Have fun, let the chips fall where they may!
Attached Images
File Type: png Screen Shot 2013-01-29 at 3.18.43 PM.png (93.9 KB, 53 views)
  Reply With Quote
Old 29th January 2013, 09:48 PM   #29
diyAudio Member
 
djmeverett's Avatar
 
Join Date: Dec 2011
Location: Washington
I was just wondering if you couldn't take a full diameter block and bore out stepped blind? dead end holes and leaving enough material at the throat end to keep the block mounted to the chuck. It would of course need to be much deeper than the finished horn length.
Then have space to turn the guts to the final smooth curve.
Then band saw or cut off the chuck throat end leaving you a smooth 2" throat.
But then when I think about it wouldn't it also make some sense to just cut the top and bottom on the band saw like the ends?
Well maybe that would work...but then you wouldn't get to use your lathe !...
Anyway looks like a cool and ambitious project djn....for sure!
I hope you post photos or videos and such in this thread so I can follow!
  Reply With Quote
Old 29th January 2013, 10:20 PM   #30
djn is offline djn  United States
diyAudio Member
 
djn's Avatar
 
Join Date: Oct 2004
Location: Waterford Michigan
Those where just HD lumber and the black sides was from a cheap scraped laminated book case. They were just for experimenting with the process. Here are pix of the finshed speakers. The horns are made from mahogany.
Attached Images
File Type: jpg IMGP0191.JPG (82.5 KB, 33 views)
File Type: jpg 4569381353_63eabc0875.jpg (174.2 KB, 39 views)
__________________
My "Art" website http://home.comcast.net/~djnagle/site/
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Weak prints from a Samsung CLP-650N peranders Everything Else 7 2nd May 2010 05:41 PM
how to make spherical wood horns, step by step angeloitacare Multi-Way 0 29th May 2007 01:50 AM
Audiophile wood horns 1" nostrodan Vendor's Bazaar 0 13th February 2007 05:08 PM
wood horns for Klipsch LaScala karma Multi-Way 15 4th December 2006 10:49 PM


New To Site? Need Help?

All times are GMT. The time now is 03:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2