| Learning target: You know how to distinguish the machine coordinate system from the part coordinate system. You know how to determine the WCS. You know different methods of determining the
part coordinate system
by determining the reference surfaces, reference lines, points, etc. You
can develop a special strategy for determining the
coordinate system in special cases (such as in the case of determining the
part coordinate system
using a plane, a cylinder axis and a circle center).
You know the effects of the order of establishing
datums. You know how the measuring result and the measuring uncertainty are affected by the number of probing points and their distribution. You understand the necessity of checking and requalifying styli in the event of a collision.
In this unit, you will learn ...
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what a part coordinate system is (and how it differs from the machine coordinate system)
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how
datums are determined and why the order of
datums is important
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what effect the number of probing points and their distribution have on the measuring result
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why during the measurement it is so important to be aware of the risks of collision and of shaft probing. |
At the end, this unit is also followed by a
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