How Tolerances Affect CNC Price

Tolerance defines the acceptable variation in a part dimension. Tight tolerances can be necessary for fits, bearings, sealing surfaces, or precision assemblies, but applying them everywhere raises cost.

Why tight tolerances cost more

Very tight tolerances may require slower machining, extra finishing passes, temperature control, more inspection, and more experienced operators. Scrap risk can also increase.

Use functional tolerances

Specify tight tolerances only on features that truly need them. Non-critical surfaces can often use standard shop tolerances, making the part easier and cheaper to produce.

Communicate clearly

Include datum references, fit requirements, and inspection expectations on the drawing. Ambiguous tolerance notes can lead to conservative pricing.