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How to draw a Non-tanget curve

5 REPLIES 5
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Message 1 of 6
ajpg86
2214 Views, 5 Replies

How to draw a Non-tanget curve

Hello, i have encountered a problem with this non-tangent curve. It reads

Northwesterly, along a non-tangent curve to the right, said curve having a radial bearing of N78d 35' 00" E , aradius of 1070.00 feet , a central angle of 20d 11'01" , a chord bearing and distance of N01d 19'29"W , 374.98 feet, and arc lenght of 376.93 feet to a found 1/2 rod.

 

I have tried various ways without luck , any suggestions ?

5 REPLIES 5
Message 2 of 6
johngordon6189
in reply to: ajpg86

from the line where the arc connects, draw a line at the radial bearing listed at the given radius distance.  You have the rest of the information you need in order to draw the arc.  The radial bearing is given in order to draw the arc.  You can then set the other radial line of the arc given the central angle given, or draw the chord and then draw the arc with the given start, end and central points.

John Gordon
CAD Manager/Survey Technician

C3D 2018/2020
Microstation
Windows 10
Message 3 of 6
AllenJessup
in reply to: ajpg86

Draw a line at the radial bearing for 1070'. That's the radius point. Turn 20° 11'01" off that radial for 1070'. That's the PT. Draw a 1070' radius circle based at the radius point and trim with the radial lines.

 

You can also plot out the chord bearing and distance to get the PT and intersect 2 1070' circles based at the PC and PT. But I prefer to draw the radials because it's usually more accurate.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 4 of 6

OK John, you beat me to it.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

Message 5 of 6
doni49
in reply to: ajpg86

In reading your message, it seems to me that this arc is over-constrained.  There is more than enough info provided to get an arc drawn.  But if just one of these distances and/or bearings is blown, then you're going to end up with multiple possible curves.

 

I see a chord bearing and distance.  If you draw the chord, then place a circle at each end (both the specified radius), the point where they intersect will be the center point.

 

I suppose you could use this extra data just to confirm that nothing is blown.



Don Ireland
Engineering Design Technician




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Message 6 of 6
AllenJessup
in reply to: ajpg86

A final way to do it (assuming that's the only non-tangent curve) is to run the rest of the description backwards from the POB and use the final endpoint as the PT then intersect the circles.

 

Allen



Allen Jessup
Engineering Specialist / CAD Manager

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