#### Update Two Axes (Boss)

The Update Two Axes soft key can be used to measure a circular boss (external circle feature) on the part and then use its center coordinates to update a specified work offset.

1. Press the Set Work Offsets soft key on the second page of the Main screen. The soft keys at the bottom will change to show the different types of features you can measure to set a work offset.

2. Press the Update Two Axes (Boss) soft key to display the Update Two Axes (Boss) screen.

Parameters Definition:

- Work Offset - Specifies the Work offset which is chosen to be update.

- Measured - Specifies the location of the Work Offset. The value is learned from a circle (boss) learn process.

- Offset - The work offset will be offset this distance away from the measured feature.

- Prehit Distance - Specifies the location that the probe will start searching for the surface. This is the distance away from the surface nominal that the probe will move at the "finding" speed that was established in the setup screen.

Available Navigation Bar Soft Keys on this Screen:

|  |  | Set Work Offsets This soft key displays a new screen with new soft keys for updating work offsets in various situations.
| Select a Work Offset to Update This soft key scrolls through the work offset listing one by one with each press of the soft key. |  |
|  |  | Confirm to Update Work Offset This will be available after the machine has learned the feature location. It will save the command to the program.

Follow the on-screen instructions to measure a circle, select the work offset to update, and then touch OK to update the work offset.

Update Process:

1. Position the probe next to the side of the boss shown as position A below. Press the Read Position soft key. The distance from the surface will be the same during measurement.

2. Position the probe above the center of the boss shown as position B below. Press the Read Position soft key. This location will be used to determine the center of the boss and the distance away from the boss for safely moving from measurement point to measurement point. Press the Back to Last Step soft key to cancel this measure position.

3. Press the Execute soft key . NC Gage takes one hit below this position to determine the height of the boss. It then automatically takes hits in a similar fashion as depicted below.

Image indicating the manual positions to jog the probe to (A-B) and the automatic probing pathways (red lines) taken by NC Gage as it measures four points (positions 1-4)

4. Once probing has completed, the measured values are updated with the circle's center. Select the Work Offset name from the list by pressing the Select a Work Offset to Update soft key until the desired work offset is highlighted. Parameters for each highlighted work offset will be updated on the screen as each one is selected.

5. Press the Confirm soft key to update the work offset for the axes in the work face normal. Press the Return soft key to return to the previous screen without saving.

The following is the specific feature path and logic built into NC Gage:

- Read position of probe next to side of boss, Z value will be measurement height.

- Read position of probe above center of boss, XY values define center, Z value is safe height.

- Prehit radius = projected 2D distance between two read position points.

- Move to safe height.

- Move at safe height to a point above prehit point 1, which is prehit radius from center in +X.

- Drop to measurement height.

- Measure point, target is center at measurement height.

- Move to safe height.

- Move at safe height to a point above prehit point 2, which is prehit radius from center in -X.

- Drop to measurement height.

- Measure point, target is center at measurement height.

- Move to safe height.

- Move at safe height to a point above prehit point 3, which is prehit radius from center in +Y.

- Drop to measurement height.

- Measure point, target is center at measurement height.

- Move to safe height.

- Move at safe height to a point above prehit point 4, which is prehit radius from center in -Y.

- Drop to measurement height.

- Measure point, target is center at measurement height.

- Move to safe height.