Creating a 2D Radius Gage

To create a 2D Radius Gage with a Cross Section:

Create the cross section. For details on creating a pointcloud cross section, see "CROSS SECTION". For details on creating a mesh cross section, see "Mesh CROSS SECTION Operator".
Select the Cross Section Slide Show button from the Pointcloud toolbar (View | Toolbars | Pointcloud) to view the cross section in a 2D view.
Hold the Shift key down and move the mouse pointer onto the desired radius. A display widget appears. The display widget shows the nominal, measured and deviation values for the radius.

2D Radius Gage display widget showing the nominal, measured and deviation values for the radius

Click the Left mouse button to select the radius. A widget dialog box appears.

A - 2D Radius Gage ID

B - Radius Nominal value

C - Algorithm used to calculate the radius

D - Cancel button

E - Create button

F - Use the bar to move the widget dialog box

G - Radius Deviation value

H - Radius Measured value

2D Radius Gage widget dialog box

From the widget dialog box, you can do the following:

Change the 2D Radius Gage ID (A) and the nominal value (B).
From the list (C), select the algorithm the software uses to calculate the radius.
Click the Create button (E) to create the radius gage, or the Cancel button (D) to close the widget dialog box without creating the radius gage.
Position the mouse cursor over the bar on the left side of the widget (F). Click and hold the left mouse button, then drag the widget in the Graphic Display window to reposition it. Release the mouse button when the widget is in the desired location.

When you create the 2D Radius Gage, its associated command is created in the Edit window. You can create additional radius gages as needed.

Once you create a 2D Radius Gage, you can use it in Location and Distance Dimensions, and Constructions. For Location Dimension, Form is not supported.

To change the radius settings:

Edit them directly in the Edit window.
Click the radius gage command in the Edit window, and then press F9 to open the 2D Radius Gage dialog box to make your changes.

How the 2D Radius Gage is Calculated

When the cross section has both nominal (black polyline) and measured (yellow polyline) data:

Calculating the Nominal 2D Radius

Starting from the initial picked measured point, the nominal radius is found on the nearest black polyline. The software calculates the nominal (theoretical) radius for a least square best fit circle, using all the nominal points that are within 0.005 mm standard deviation.

Calculating the measured 2D Radius

The software calculates a least square best fit circle using the actual points on the yellow polyline that are associated with the nominal points.

When the cross section has only nominal data (black polyline):

Starting from the initial picked nominal point, the software finds the radius on the nearest black polyline. The software calculates the nominal (theoretical) radius for a least square best fit circle, using all the nominal points that are within 0.005 mm standard deviation.

When the cross section has only measured data (yellow polyline):

Starting from the initial picked measured point, the software calculates the radius for a least square best fit circle. The software uses all the measured points within 0.050 mm standard deviation and a search distance of 0.25 mm to find any additional segments that belong to the radius.

2D Radius Gage Overview

2D Radius Gage Dialog Box