Circle help

[Mason Dixon]

Here is what I'm trying to draw. I need to draw the ring around the radial spoke pattern in the center and the monument sign out front. I need to have them in equal, roughly 3' segments with 3/8" joints for caststone manufacture.....I can get it looking close with array command but its not accurate enough in that the segments are different sizes. I am a total newb at acad and don't have any experience with breaking things, point styles, measure divide length, etc. If you could give a step by step that would be really helpful.

The smaller ring has an inner radius of 9'-10", the outer is 11'-6"

 

The monument sign arc has an inner radius of 41'-2", the outer is 42'-6", 40' in length

 

Thanks

 

[ReMark]

I would have thought that you had resolved this by now. What happened? Did you try the suggestions and find they didn't work?

[Mason Dixon]

They way i've been doing it is to use the equations posted above and enter them into a polar array command but this doesn't seem to have great precision. A lot of rounding up and down on all the numbers which makes the roughly 3' segments different lengths. I need to have everything one size so our caststone mold guy only has to make 1 mold.

[ReMark]

The polar array can only be as exact as the numbers you input. What are you using for angle between items?

[paulmcz]

Here you have the small segment which they are 24 in the circle and the big one, 40' along the arc.

CH.dwg

[eldon]

If the 3/8" joint is to be parallel, then the sides of the joint are not radial.

 

Better to work from centre of joint to centre of joint around the circumference, and then offset those radial lines both ways by 3/16" to give the 3/8" joint.

[paulmcz]

If the 3/8" joint is to be parallel, then the sides of the joint are not radial.

 

Better to work from centre of joint to centre of joint around the circumference, and then offset those radial lines both ways by 3/16" to give the 3/8" joint.

 

it is parallel in my drawing, isn't it?

[eldon]

it is parallel in my drawing, isn't it?

 

Yes indeed it is. My only slight comment would be that your outer radius of the smaller circle seems to be 10" too much and I would probably use 20 or 21 segments.

 

My comment about the joints was aimed at those who are calculating. Makes a complication if you do not allow for it.

[paulmcz]

Mason Dixon needs that radius 11'-6", which it is. I don't quite get your point in this.

[paulmcz]

I see it now. You took the measurement he said in the previous post. Well, that has been modified since then. Who knows what it actually should be.