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16. SETTING-OUT ARC
Specifying points and curve parameters
Parameters that can be entered may be restricted depending on the points spec-
ified in step 5/6. Parameters that can be entered are marked with a circle (
○
).
Those that cannot are marked with a cross (
×
).
Precaution when performing setting-out arc
In the following cases parameters cannot be calculated:
when Radius<
When Arc<Chord
When Tan In
×
2<Chord
When the included angle between the back tangent and the azimuth angle
between the From Pt. and To Pt is 0°, or exceeds 180°.
Parameters
Set
coord
Radius
Angle
Arc
Chord
Tan In
Bk
tan
Directi
on
To pt
Center pt
×
×
×
×
×
×
○
To pt
Intersect pt
×
×
×
×
×
×
○
Center pt
Intersect pt
×
×
×
×
×
×
○
To pt
○
○
○
×
○
○
○
Center pt
×
○
○
○
○
×
○
Intersect pt
○
○
×
○
×
×
○
Chord
2
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