millimetresizing

Millimetresizing is the practice of adjusting the size of a design, component, or object so that its final dimensions are specified in millimetres. It is common in design, prototyping and manufacturing to ensure parts fit within defined tolerances and can be produced to real-world size.

Methods include parameterised CAD scaling with millimetre units, direct feature scaling while maintaining proportional relationships, and manufacturing processes such as milling, turning, and 3D printing that realize the target size. Designers also perform tolerance analysis to account for material shrinkage, machining allowances, and assembly clearances.

Applications include mechanical housings, enclosures, medical devices, automotive parts, electronics casings and jigs or fixtures. Millimetresizing also supports translating digital designs to physical production when CAD data is exported for CNC machining or 3D printing.

Precision and tolerances depend on the process. High-precision work can achieve tolerances of a few hundredths of a millimetre, while typical 3D printed parts may have tolerances around ±0.1 to ±0.2 mm. Material properties, temperature changes, and surface finish can alter final dimensions.

Limitations include non-linear scaling of features such as threads and text, nonuniform shrinkage, and fit issues in assemblies. Effective millimetresizing uses standard tolerancing practices and verification through measurement to ensure functional outcomes.