Creates a GR-Circle feature that dynamically builds a circle from the associated points, clouds or geometry.
Circle Features report the following criteria:
Diameter. Which is the distance across a circle.
Radius Which is the distance from the circle's origin to its edge.
Circularity. Computed as the Max - Min deviation with respect to the RMS fit object. This effectively adds the largest deviations on either side of the surface of the object to create a form deviation estimate.
Origin X, Y, Z. Which reports the origin point in the current working frame.
Mag XYZ. Reports the absolute distance between the measure and nominal circle centers.
I, J, K. Which reports the direction of the circle in the working frame.
Projected Angles (Rx from Y, Ry from Z, Rz from X). Report the relative projections of the normal vector onto the corresponding nominal planes.
Angle Between . Which reports the angle between the nominal and measured circle.
RMS. Which reports that RMS of the measured circle.
Circle Fit Settings include the following specific considerations:
Single Point Circles
Only a single point is necessary. Single point circles allow you to lay a probe in a hole (assuming the hole diameter is smaller than the probe diameter) and create a circle with a single measurement, based on how far the probe sinks into the hole.
To create a single point circle, create a circle with a projection plane defined. If the GR-Circle has exactly one point, a single point circle will be created automatically centered on the point with a diameter equal to the intersection of sphere with the probe diameter and the projection plane. If you continue measuring additional points, a regular circle relationship will be created instead. Note that the measured point must be on the positive side of the projection plane and have equal planar and radial offsets.
Nominal Direction The nominal direction of the plane can be adjusted using the Reverse normal Vector option. The normal vector can also be set dynamically to match the nominal line using the Align with Nominal check box. This ensures the Angle Between value reported is always the smallest possible angle.
Cardinal Points two cardinal points can be built using the GR-Circle feature. These include both the origin point and a point on the nominal vector, which is shifted a distance of the circle radius upward.
The following additional Intersection circles can also be created, provides greater detail on the construction methods:
Sphere and Plane Intersection. Computes and builds a circle from the intersection of a sphere and a plane.
Cylinder and Plane Intersection (options). Builds a circle from the intersection of a cylinder and a plane based on the selected method.
Two Cone Intersection. Builds a circle from the intersection of two cones.
Cone and Cylinder Intersection. Builds a circle based on the intersection of a cone and a cylinder
Cone and Plane Intersection Options. Builds a circle based upon the intersection of a cone and a plane based on the selected method.
Note - More details on the computation process for Intersections can be found here.
From Multiple Circles. This option offers a quick method to build a circle that uses the centroid from each of the selected circles. This works great when attempting to determine the diameter of a bolt hole pattern for example.