The Co-ordinate Measurement Machine (CMM) is an inspection device which works in the same way as your finger when it traces map coordinates. Using either a Machine Co-ordinate System (MCS) or a Part Co-ordinate System (PCS), as shown in Figure 5, components can be inspected to obtain real deviations from its nominal value.
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| Machine Co-ordinate System (MCS) | Part Co-ordinate System (PCS) |
| Figure 5: An illustration showing the difference between Machine Co-ordinate System (MCS) and Part Co-ordinate System (PCS) | |
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