### Constructing a Best Fit or Best Fit Recompensate Cone

A best fit cone can be constructed using six or more features. The first three inputs must be on an approximately planar cross section of the cone that is normal to its centerline. The remainder of the points should lie either above or below the plane defined by the first three points, but not on both sides of the plane. This method of measuring will yield the best results. The best fit construction method takes the actual measured points, rather than the ball's center (as in the case of best fit recompensate). In both cases PC-DMIS computes a least squares cone, one for which PC-DMIS minimizes the average squared distance from the data points to the cone.

To Construct a Best Fit or Best Fit Recompensate Cone:

1. Access the Construct Cone dialog box (Insert | Feature | Constructed | Cone).

2. Select either the Best Fit or BF Recomp option.

3. Enter in at least six features.

Note: If you choose Best Fit Recompensate at least one feature must be a point.

4. Click the Create button.

The Edit window command line for this option would read: CONSTR/CONE,BF,feat_1,feat_2,feat_3,feat_4,feat_5,feat_6
(Uses the actual measured points for construction.)
or
CONSTR/CONE,BFRE,feat_1,feat_2,feat_3,feat_4,feat_5,feat_6
(Uses the center of the probe for measurement.)

Constructing a Cone from Six or More Points | A - Best Fit cone constructed from nine points.