Spawn Olson/Nagaoka Horns the Next Generation

[planet10]

I think that MJK sheets are unit agnostic, you just need to say what you are using.

In the case of the Spawns, the designer thinks in imperial, just be glad he designs them at all.

In any of the paid plan sets you get whatever conversion you need, and a suitable bribe can go a long ways with any of the free plans.

Personally i work in a mix of units, Chris works in metric so i output drawings in mm for him, he then measures the material at hand and adjusts -- 18mm typically ranging from something like 17.7 to 18.6mm so far. Sometimes he runs into sheets that differ in thickness over the same sheet.

dave

[GM]

Originally Posted by doubtingthomas

How can anyone love fractions? .........why not just throw it out and move into this day and age.

Apparently our construction industry. Instead of switching to the decimal system with the advent of hand held calculators, they waited for ones that did fractions.

Dunno, ask these folks: DAO 201-21: COMMERCE METRIC CONVERSION

GM

[Jockaruba]

Originally Posted by planet10

In any of the paid plan sets you get whatever conversion you need, and a suitable bribe can go a long ways with any of the free plans.

dave

Hi Dave,
Since I set my mind the Kirishima and and I really don't know anything about speakerdesign and horns I am not comfortable with continuing trying to do the conversion myself (and then once built find out it isn't as good as it can be).

Please let me know what we can work out for a 'suitable bribe'

Jock

[Bob Brines]

Originally Posted by gafhenderson

yeah this is slightly frustrating with the MJK sheets. i can't workout if i can switch the units from inches to MM with some kind of option, but takes forever swapping between square MM in my designs and square inches in the worksheets. MM is so easy, you just say what you see. 18mm vs how ever many fractions of a whole inch.

If you don't like the units, change them. if it says 1*in, replace it with 2.54*mm or vis versa. Let the program do the comversions. BTW, all of the math is in MKG.

Bob

[planet10]

eMail me...

dave

[planet10]

An update to the planset... http://p10hifi.net/FH/downloads/Spaw...set-070412.pdf

A minor update to all the plans, and -- thanx to a donation by Jocjaruba to diyAudio and a pledge to frugal-horn.com -- a set of 18mm drawings for Kirishima.

dave

[doubtingthomas]

Originally Posted by planet10

I think that MJK sheets are unit agnostic, you just need to say what you are using.


Personally i work in a mix of units,

dave

Haven't Nasa done that a couple of times with rather disappointing results?
But I fully accept that one shouldn't look a gift horse in the mouth.

[planet10]

NASA's problem was that the "software" wasn't clever enuff to convert units -- or that no-one bothered to specify the units. Alot of energy & expense could certainly be avoided if everyone used the same untis,

dave

[gafhenderson]

Originally Posted by Bob Brines

If you don't like the units, change them. if it says 1*in, replace it with 2.54*mm or vis versa. Let the program do the comversions. BTW, all of the math is in MKG.

Bob

i can't get the Sd definition/unit/value to change. i end up with say an 800square inch Xsection instead of cm2/m2.

what am i doing wrong? i can't see the equation anywhere on the worksheet that defines the maths for Sd. its not a major problem converting, its just time consuming when you make a mistake.

its not that i'm ungrateful etc, its just very confusing when you've got things like Xmax in MM, VAS in litres then lbs and inches. once again wouldn't mind so much if i could get sketchup to display feet and inches in terms of a decimal instead of fractions as i can just switch between the value using sketchup instead of having to convert.

[fastbike1]

Sketchup

Window>Model Info>Units>decimal.

You can move back and forth in a given sketch, i.e. not fixed at start.

Google is your friend as well.

Originally Posted by gafhenderson

i can't get the Sd definition/unit/value to change. i end up with say an 800square inch Xsection instead of cm2/m2.

what am i doing wrong? i can't see the equation anywhere on the worksheet that defines the maths for Sd. its not a major problem converting, its just time consuming when you make a mistake.

its not that i'm ungrateful etc, its just very confusing when you've got things like Xmax in MM, VAS in litres then lbs and inches. once again wouldn't mind so much if i could get sketchup to display feet and inches in terms of a decimal instead of fractions as i can just switch between the value using sketchup instead of having to convert.