HEIDENHAIN IK 5494-2D - Manual (Page 161)

5
Measuring
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Preparing to use video probes
The system stage and optical system must be well-maintained, free of scratches and other damage and
clean. The optical magnification and part lighting must be prepared as described in Chapter 4: Probes Chapter 4: Probes.
Establishing the measurement reference
A reliable measurement reference must be established before part features can be probed and measured.
This reference will be created by the user and will ensure:
• A level part surface
• Precise part alignment
• An origin or datum zero for the measurement coordinate system
Leveling the part (optional)
When the surface plane of the part is not orthogonal to the measuring axis, small cosine errors can be gen-
erated during the measuring process. These errors can be minimized or eliminated by leveling the part.
CAUTION
This is not required in most well-maintained systems. Additionally, if the depth of
field of the lens system is not much less than the level error, no benefit can be gained
from leveling the part.
To level the part:
1 Click the Datum/Level menu item. A description of the leveling measure-
ment process will be displayed in a prompt window.
2 Perform the leveling measurement by probing 3 or more points that are well
distributed across the surface of the part using the Height probe, and then click
OK in the prompt window.
Three points of the Metronics quickie slide are probed to perform part leveling
The Measurement Process