What are the four shortcomings of implied 90-degree angles?
What will be an ideal response?
ANS:
The general note for implied 90-degree angles may work for some drawings, but it does have four shortcomings:
1. The tolerance zone is wedge-shaped. It increases as the surface gets farther from the origin.
2. There is no datum sequence specified, which means there are at least two ways the part can be measured.
3. The lack of a specified dimension results in the requirement often being overlooked.
4. When general angular tolerances are inspected, common inspection methods often do not comply with the requirement for an angular dimension in the standard.
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