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 Need help reading blue prints for wood horns.
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 Multi-Way Conventional loudspeakers with crossovers

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diyAudio Member

Join Date: Oct 2004
Location: Albuquerque, New Mexico
Quote:
 Originally Posted by GM Hmm, the distance from the focal point to the beginning of the flare is 34 mm and is [3] segments long, so seems it's 34/3 = 11.3333 mm between segments, but in the metric world this begs the question: 'why'? GM
But then look at the segment between 4 and 6. Off to the left it indicates it is 20mm. So the segment between the crosshairs and 4 must be 14mm.

I just added to the CL with section 17, 18, and 19. Making the assumption that the section between the crosshairs and 4 is 14mm, and the sections are 10mm each, the total is 170mm just like the radius.

diyAudio Member

Join Date: Feb 2006
Location: Cascais
Quote:
 Originally Posted by GM Hmm, the distance from the focal point to the beginning of the flare is 34 mm and is [3] segments long, so seems it's 34/3 = 11.3333 mm between segments, but in the metric world this begs the question: 'why'? GM
I'm trying to read it (in my metric universe) and doesn't show the starting point for segment #4. It should be/read 40 (something) if 1x segment = 10 (mm or something). (10 mm = 1 cm)
It shows only starting/ending point for measurement 34 (mm).
This for some reason shows that the source/starting point for segments #1, #2, #3, #4... it's not the same as the measurement (or segment) of 34 mm. In my logic world 1x segment #4 = 40 mm, away from "segment 34". Don't ask me why...

 29th January 2013, 03:14 AM #13 diyAudio Member   Join Date: Dec 2011 Location: The Dells, WI My guess is you're missing the sheet with the coordinate of each numbered point.
diyAudio Member

Join Date: Feb 2006
Location: Cascais
Quote:
 Originally Posted by djn But then look at the segment between 4 and 6. Off to the left it indicates it is 20mm. So the segment between the crosshairs and 4 must be 14mm.
I must admit that, if that's the beginning of measurement of segments, it's very logic. I just taught #4 was preceded by number 3, 2 and 1. Where are they?!

diyAudio Member

Join Date: Oct 2004
Location: Albuquerque, New Mexico
Unfortunately, this is all they have for measurements. But here is the full print.
Attached Files
 A-1K (5).pdf (145.0 KB, 24 views)

frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
The image attached in post #1 is not quite to scale. Except for one of the radial dimensions of the horn curve, the numbers seem consistant (the red segment shows where the curve is concave).

Dimensions are in mm except for the axis which is in cm. the centre of the arcs is at 2.6 cm

dave
Attached Images
 Yuichi-horn.gif (23.2 KB, 170 views)
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diyAudio Member

Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
 Originally Posted by dumptruck Heh, well, I've still got this drawing open and that's easy to do... It doesn't seem to work out any less odd. I'm not sure where you're getting 3 segments for that, though, as no '0' mark is definite. Meanwhile, the 20mm deep section is clearly two segments, bringing it back to 1cm per segment.
Oh well........ From the drawing. I did say from the focal point, i.e. the radius arc and there's only one...... Yes, I noticed the discrepancy, but didn't know if the drawing was to scale, but figured you'd try it on your drawing, so nothing ventured, nothing gained. Anyway, it wouldn't be the first drawing ever done in multiple scales for tooling purposes or drawn over a scaled grid that I'm not familiar with.

GM
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diyAudio Member

Join Date: Jul 2006
Location: Bay Area, CA
Quote:
 Originally Posted by djn Unfortunately, this is all they have for measurements. But here is the full print.
Why not just print out these plans full scale so that throat measures 25.5mm on the physical print. Then use a pair of calipers to carefully measure what the actual dimensions are every 1cm out. Seems like the best way to eliminate guess work, assuming the drawings are accurate of course.

diyAudio Member

Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
 Originally Posted by planet10 Dimensions are in mm except for the axis which is in cm. the centre of the arcs is at 2.6 cm
OK, so the segments begin 3 cm behind the focal point, but what arcs are at 2.6 cm, the ones at the mouth corners?

GM
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frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
 Originally Posted by GM OK, so the segments begin 3 cm behind the focal point, but what arcs are at 2.6 cm, the ones at the mouth corners?
The centre/origin of the arcs are at 2.6 cm on the vertical axis, 14mm below the opening.

dave
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