What is the smallest machining tolerance possible?

The smallest machining tolerance possible depends on various factors such as the machining process, the material being worked on, the precision of the equipment, and the desired level of accuracy. In general, for conventional machining processes like milling, turning, and grinding, tolerances can range from a few micrometers (microns) to even sub-micron levels.

For extremely high-precision applications, processes like ultra-precision machining or diamond turning can achieve tolerances in the nanometer range. These processes utilize special tools and techniques to achieve exceptionally tight tolerances, often required in industries such as aerospace, optics, and semiconductor manufacturing.

Ultimately, the achievable tolerance is determined by the capabilities of the equipment, the skill of the machinist, and the requirements of the specific application.
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