Applies To
	Product(s):	MICROSTATION
	Version(s):	V8i, CONNECT Edition
	Environment:	N\A
	Area:	General
	Subarea:	N\A
	Original Author:	Bentley Technical Support Group

Problem

Non-circular arcs (with different axes)

Sometimes non-circular arcs exist in a design while standards require
all arcs to be circular.

One example of how such non-circular arcs can be created is when
exporting a 3D file with arcs with varying elevations to 2D.

Solution

Drop B-spline Curve to Arcs

You can approximate the arcs with circular arcs using the Drop B-spline
Curve tool:

1. Choose the attributes (Level, Color, etc.) you want to use for the
new arcs.
2. From the Modify Curves tool box, choose the Drop B-spline Curve tool.
- Keep Original: ON (not necessary, but advisable)
- Drop To: Arcs
- Method: Max Chord Height
- Height: your tolerance (this is the maximum distance between the
existing arcs and the new ones)
3. Optionally locate one or two elements to check the results.
4. Select, e.g. with the Power Selector, all the arcs you want to
approximate.
5. Choose the Drop B-spline Curve tool again. This will create new arcs
for all the selected ones.