Arcs by P.C., arc length, Radius, Tangent bearing, Delta

[justinxxvii]

I'm trying to figure out how to plot an arc from a plat that has the arc length, radius, and initial tangent. Also, how can I decide if my arc goes clockwise or counter clockwise?

Here is my data:

L = 336.01
R = 624.4
Angle = 30.49'59"
ITB = N39 45 00W

I don't have the chord

Thanks!

Justin

[Opie]

I'm trying to figure out how to plot an arc from a plat that has the arc length, radius, and initial tangent. Also, how can I decide if my arc goes clockwise or counter clockwise?

Here is my data:

L = 336.01
R = 624.4
Angle = 30.49'59"
ITB = N39 45 00W

I don't have the chord

Thanks!

Justin

You could draw a circle, break it, then use the LENGTH command to set it to the desired arc length. You could then align it to the right location.

[rkmcswain]

I'm trying to figure out how to plot an arc from a plat that has the arc length, radius, and initial tangent. Also, how can I decide if my arc goes clockwise or counter clockwise?

Here is my data:

L = 336.01
R = 624.4
Angle = 30.49'59"
ITB = N39 45 00W

I don't have the chord

Thanks!

Justin

Depends on what you are starting from. Follow these steps in the attached image.

1. Assuming you have a tangent line going into this curve...
2. Draw a perpendicular line from the endpoint towards the center of the arc, make the length of this line equal to the radius 624.4, and copy this line in place.
3. Next, rotate one of these two lines, the amount of the delta 30d49'59" using the radius point as the rotation point.
4. At this point you can draw the arc. You know the center point, start point, and end point.

If you do not have a starting tangent line, then you can still do this, but rather than the first line being perpendicular to something - it will just be wherever you draw it.

[justinxxvii]

Dude thank you sooo much!

That diagram helped me understand what you meant!

Rock on bro

Justin

[reed.stephens]

. . . [*]Assuming you have a tangent line going into this curve...

I don't think I would want to assume this if I were given a tangent bearing as part of the curve description. I only see this call when the line going into the curve is NOT tangent. To be safe when presented with an Initial Tangent Bearing, I will create a line at that bearing and then proceed as described.