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Lesson 6: - Coggle Diagram
Lesson 6:
Types of Dimensioning
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4) Combined Dimensioning
- Uses both chain and parallel dimensioning
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3) Chain Dimensioning
- should only be if the function of the object would not be affected by the accumulation of the tolerances.
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8) Dimensioning of Circle, Arc, and Hole
- A circle is dimensioned by its diameter. An arc is dimensioned by its radius. Holes are located by their centerlines
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9) Dimensioning Angles
- It is marked with a curved dimension line, and has the degree ' symbol
Types of Tolerance
2) Unilateral Tolerance
- Allowed to vary in only one direction
3) Limit Tolerance
- The upper and lower limits of the dimension are specified
Tolerance = upper limit - lower limit
1) Bilateral Tolerance
- Allowed to vary in two direction from the spcified dimension. Both directions need NOT vary by the same amount
assemblies
1) clearance fit
- there would still be allowanced for two parts to move, such as door hinge
2) Interference fit
- It would be difficult to move (or remove) the two interfacing parts. Usually, a lot of force is needed to remove the two parts.