From the course: Introduction to Geometric Dimensioning and Tolerancing

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CNC limitations

CNC limitations

From the course: Introduction to Geometric Dimensioning and Tolerancing

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CNC limitations

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- [Instructor] Speed and precision are frequently in conflict in manufacturing processes. Any movement requires acceleration, and accelerations generate force. These forces cause machines to deflect, which reduce the ability of a given machine to maintain its manufacturing tolerance. These deflections affect many types of machines, from 3D printers, to water jet cutters, to CNC mills. Any vibration in a machine, from motor energy, to cutting forces during machining processes, will add deflections. For subtractive processes like milling or turning, tool bits wear over time. CNC machines can compensate for tool wear up to a point, as long as the tool bit is still effectively removing material. It is much more difficult for CNC equipment to compensate for uneven temperature changes of a part as it's manufactured. Heating, from things like cutting forces or 3D printer nozzles, can cause parts to expand and deform. Material may be removed or added in ways that violate dimension tolerances.

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