topic Re: drawing CIRCLE when i only know the chord length and number of chords in Fusion Design, Validate & Document Forum

drawing CIRCLE when i only know the chord length and number of chords

dieselguy65 — Sun, 12 Aug 2018 19:01:03 GMT

i am trying to draw a circle, based on only knowing the chord length of 0.625" and the fact it has 48 equal chords.

I do not know the radius of the circle.

i have a formula to figure it out.

but i thought it would be simple thing to draw with the information i have been given.

2 days of failed attempts has me asking if its possible, without first doing the math manually to figure out the radius of the circle.

and if it is , could someone lead me in the right direction to get started?

thanks

Re: drawing CIRCLE when i only know the chord length and number of chords

HughesTooling — Sun, 12 Aug 2018 19:17:49 GMT

does this work?

Mark

Re: drawing CIRCLE when i only know the chord length and number of chords

dieselguy65 — Sun, 12 Aug 2018 19:52:14 GMT

those are the numbers i got when i run the formula on paper.

but i am not sure how to get ti transferred to the computer.

other than using the paper results, to draw a circle 7.556" in diameter and placing the chords on it.

but i was trying to do it, knowing the chord length, and number of them, that also tells me the angle between them..

i was drawing two chords, of the correct length, with the angle, and trying to pattern that.

but without having the circle center defined it wasnt working

i can draw a line, from the chord ends, to a common point, that would be the center, forming a triangle with angles of 86.25, 86.25 and 7.5 degrees, with the base being the chord length.

if that even makes sense.

i was hoping for a way for fusion to find me the center of it.

my other way was to make a circumscribed 48 side polygon, after i calculated the radius

Re: drawing CIRCLE when i only know the chord length and number of chords

wersy — Sun, 12 Aug 2018 20:40:01 GMT

Why don't you take the center first.
Draw two lines of equal length from the center at an angle of 7.5°.
Close the two lines at the end with a line to a triangle.
Measure this line with length of 0.625
This automatically results in the radius.

Re: drawing CIRCLE when i only know the chord length and number of chords

davebYYPCU — Sun, 12 Aug 2018 21:30:55 GMT

With just Your particulars,

48 sided polygon, dimension a leg, orientate as desired.

Might help....

Re: drawing CIRCLE when i only know the chord length and number of chords

dieselguy65 — Sun, 12 Aug 2018 22:10:15 GMT

@wersy wrote:
Why don't you take the center first.
Draw two lines of equal length from the center at an angle of 7.5°.
Close the two lines at the end with a line to a triangle.
Measure this line with length of 0.625
This automatically results in the radius.

i can do that. but was looking for a way with only the info i was given. without having to find any other angles or lengths.

Re: drawing CIRCLE when i only know the chord length and number of chords

dieselguy65 — Sun, 12 Aug 2018 22:12:49 GMT

that works great. if only i could have been able to see the tooltip. i would have found it i am sure

i was trying the inscribed and circumscribed style.

never used the one below it.

thanks

@davebYYPCU wrote:
With just Your particulars,

48 sided polygon, dimension a leg, orientate as desired.

Might help....

Re: drawing CIRCLE when i only know the chord length and number of chords

chrisplyler — Mon, 13 Aug 2018 02:15:09 GMT

Based only on info given in your first post...