Point 1D

Point - 1D

Command Activation

1,2,3,4,5,6,7,8,9	Measure→Point
Keyboard	Main Menu	Toolbar

Feature measurement point types
1D Point	+/- X, Y and Z Reported Directions. Cartesian only.
Point - 2D IR/OR 2D Points	Reported in PCS Base Planes XY, YZ, ZX. Can be Cartesian or Polar. Special cases include Inside and Outside Polar Points.
Point - 3D IR/OR 3D Points	Reported as XYZ. Can be Cartesian or Polar. Special cases include Inside and Outside Polar Points. 3D Points are not compensated for the probe radius when using a standard electronic touch probe. IR and OR 3D Points are compensated one probe radius from the PCS Origin.
Point - Vector	Surface 3D Points. Compensated by one probe radius along the defined IJK surface vector. Vector Points can be created and measured using a ASCII import table.

Definition

Points are dimensionless locations is 3D space. Points have no size. The location of a point is specified by its X, Y, and Z coordinate in a particular coordinate system. There are many points that Geomet support. These include 1D, 2D and 3D points.

Measured points consist of 1D, 2D and 3D style geometric elements. keyboard access to these points are done through the number keypad, see table 1.

Keystroke 1D Point 2D Point 3D Point

1 -Z

2 -Y

3 + 2 XY IR

3 + 4 ZX IR

3 + 6 YZ IR

3 + 9 3D IR

4 -X

5 + 2 XY

5 + 4 ZX

5 + 6 YZ

5 + 7 Vector Point

5 + 9 3D

6 +X

7 + 2 XY OR

7 + 4 ZX OR

7 + 6 YZ OR

7 + 9 3D OR

8 +Z

9 +Y

IR = Inside Radius / OR = Outside Radius

table 1, Keyboard Access

1D Points

Definition

1D Points have 1D locations. There are 6 1D point routines, designated ±X, ±Y and ±Z. Pressing one of these keys prepares Geomet to measure a single point on a planar surface, followed by a printout of the location of the center of the stylus corrected by the stylus radius in the PCS probing direction. Problems arise if the planar surface is not parallel to a PCS base plane.


figure 1, +X MCS Point	figure 2, +Y PCS Point

Figures 1 and 2, illustrate a 1D point measurement of one and the same planar surfaces prior to alignment (MCS) and after alignment (PCS 2). Although the stylus center is at the same XYZ location in both cases, the calculated points P1 and P2 are quite different. P1 resulted from a probe radius correction parallel to the X axis of the MCS. P2 resulted from a probe radius correction parallel to the Y axis of PCS 2. This illustrates how measurements of a surface in an unaligned PCS can produce erroneous results.

Single 1D Point measurements can only be used to determine the locations of planar surfaces which are parallel to the PCS planes. Pairs of 1D Point measurements on planar surfaces which are parallel to PCS planes may serve to determine the Distance between the surfaces or the location of the Bisector of surfaces. Pairs of 1D Point measurements on simply skewed planar surfaces, meaningless in themselves, may be used to define a Line on a surface or to Align the current PCS to be parallel to the surface.

Single and multiple 1D Point measurements on compound skewed plane or curved surfaces provide meaningless data.

To measure a 1D Point, press the corresponding Point direction key and gather a data point on your work piece. If you have Auto-Direction enabled, you will be prompted "Measure Auto-Dir Point" and your approach vector to the work piece will identify the probing vector.

Tolerance of 1D Points is limited to Cartesian / Linear.

1D Points are available for use in building Part Coordinate Systems. Single 1D points can establish the origin for a single PCS axis. For example: a +X Point can establish the X axis origin. Two coplanar 1D Points can establish an alignment.

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