2.3 Limits, fits and tolerance

• define the terms limits, fits and tolerance as used in drawing
• describe the types of limits and fits used in drawing
• calculate tolerance from given drawings
• calculate limits given nominal dimensions and tolerance
• appreciate the importance of limits and fits in power mechanics

“How are limits, fits and tolerance applied in real life situations?”

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1. Limits and tolerance
   40 min · 1 practice tasks · quiz
   Read the largest and smallest allowed sizes, and take the tolerance as the difference between them.
2. Limits from a nominal size
   40 min · 1 practice tasks · quiz
   Place a tolerance equally about a nominal size, or all on one side, and find the two limits.
3. Clearance fits
   40 min · 1 practice tasks · quiz
   Find the largest and smallest clearance between a hole and a shaft, including a fit that may just touch.
4. Interference and transition
   40 min · 1 practice tasks · quiz
   Calculate an interference that is always present, and a transition that can clear or grip.
5. Which fit, and does the part pass
   40 min · 1 practice tasks · quiz
   Match clearance, interference and transition to bay jobs, and reject a measured size that misses its limits.