The practical idea
A nominal dimension is the target value. Tolerances define acceptable variation so parts can be manufactured, inspected and assembled realistically.
What changes the real result?
Tighter tolerances increase cost and can reduce process capability. Apply them where function requires control rather than placing unnecessarily tight limits everywhere.
A reliable workflow
- Confirm the units, material and operating conditions.
- Use a suitable formula or reference as a starting point.
- Compare the estimate with manufacturer data and applicable standards.
- Measure the real result and record any corrections for repeat work.
Apply the guide