Do you have the degree's of angle to accompany the chord chart?
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Rocky D's chord chart
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Rock,
I don't mean to overstep here, but I think the idea is to eliminate the need for a protractor by using the circle as a starting point. Once you know the length of each chord, the angles will come naturally inside the circle. If you want to double check a layout design with the protractor, you can divide 360 by the number of sides and this will give the degree of angle. Hope this helps!Arbo & Thor (The Junkyard Dog)
The Next Loud Noise You Hear Is Me!

Originally posted by Arbo
Rock,
I don't mean to overstep here, but I think the idea is to eliminate the need for a protractor by using the circle as a starting point. Once you know the length of each chord, the angles will come naturally inside the circle. If you want to double check a layout design with the protractor, you can divide 360 by the number of sides and this will give the degree of angle. Hope this helps!ROCK
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Thanks, Arbo that is a very good answer, which is what I would have said. However, it may help if I explain the job in which I found the chord chart indispensible.
I was give the task of fabricating semicircular platforms, to go around various aircraft engine parts. The platforms were varied in height and diameter. 4' to 6' high and 12' to 16' in diameter. I had to locate braceing and wheels on equidistant points on the arc. The chord chart made the locating easy. Once I had the dimension, then I marked it on a straight edge, and carefully layed out my pattern. Works like a charm and no need for a compass only to lay out the circle.
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There is just one thing that confuses me about the geometry behind all this. Dividing 360 by the number of sides works with everything but a triangle which will work with 180 rather than 360. ie, a square...360 divided by 4 sides equals 90 degree angles. However, a triangle...180 divided by 3 sides equals 60 degree angles. Can anyone explain this without going into third semester geometry class again.Arbo & Thor (The Junkyard Dog)
The Next Loud Noise You Hear Is Me!
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In high school I enjoyed geometry because I could see it and create from it. Algebra and Trig seemed to be a total waste until I went to CDI computer training 22 years ago. Electronics and math go hand in hand!
Now a days, all my component level repair is a dinosaur trade. No one cares about it, or understands it. I'm extinct.It's not an optical illusion...it just looks like one
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