Ellipse

The Ellipse feature determines the center location, Major Axis Rotation and the Minor and Major diameter or radius of inside and outside ellipses projected into a PCS base plane. The ellipse feature will give erroneous results when not parallel to a PCS base plane. The ellipse center location is projected into a PCS base planes and are 2D in nature.

To measure an Ellipse, press the Ellipse key < x > for the default number of data points as set in System Options. Geomet will then prompt you for the type of feature being measured, see figure at left. If you have Auto Direction enabled, this prompt will not appear.

The default minimum number of points for an ellipse is 5, however we suggest using a minimum of 16 when attempting to obtain a form value.

If you required additional data points, you can repeatedly press the Ellipse key which increments the required number by one, or press < shift + X > and you will be prompted to enter the required number.

figure 2, Enter Data Point Count

figure 3, Out-of-Form Warning

Geomet performs a form validation on your captured data points. This function is called the Multi-Point Error Limit and is controlled by a setting in System Options. In the event your ellipse exceeds this limit, Geomet will prompt you whether to accept or re-measure the feature, see figure 3. If you elect < Re-Measure >, you will be prompted to capture new data points for the same feature. Note: The Multi-Point Error Limit test is only performed in the self-teach mode, not during a part program run.

Tolerance

Tolerance of Ellipses is available in Cartesian or RFS Positional Tolerance formats.

Ellipses can also be used in the establishment of the Origin in building a PCS, and all 2D feature constructions.

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Auto-Direction, Origin, System Options, , Introduction to Tolerance, Tolerance Ellipse, Motion Edit, Disable Motion, Projection Errors, Measuring with Multiple Styli, Datum Bonus Tolerance Tutorial