Question

Part 1. Select an object from your everyday life that GD&T could be applied to. Attach a graphic image of it (a photograph, a scanned sketch or a computer generated drawing) in JPEG format here.

Part 2. Identify two primary functions of this part (e.g. must assemble to other part(s), smooth rolling, must not wobble when placed on a flat surface). Briefly describe the functions (maximum of 200 words).

Part 3. Assign a minimum of two geometric tolerances (including at least one that requires the use of datums) to the part to ensure that the part will successfully achieve its two primary functions. Assign datums as necessary. Create a sketch or drawing to show where the datums and tolerances will be applied. Assign values for the tolerances, however you will not be marked on the magnitude of the tolerances.

Part 4. Briefly describe (maximum of 150 words) how the part would be inspected to verify that it meets the geometric tolerances.

Answer 1

Part-1:

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Part-2:

The above component is L-bend clamp. Its functions are

1. Holding two adjacent part at right angle

2. By use of fasteners in the holes provided, the assembled parts are kept rigid

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Part-3:

1.

In order to check the flatness of the surface, first flatness geometrical tolerance is given and datum-A is considered if the flatness condition is satisfied.

2.

Perpendicularity geometrical tolerance is given to the other surface with respect to datum-A. If the perpendicularity tolerance is satisfied then that surface is taken as datum-B.

3.

Positional geometrical tolerance is given to check the position of 4 holes withrespect to datum surfaces A and B.

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Part-4:

Inorder to inspect the above component following steps are followed

1) Initially flatness of mating surface of the component and the deviation in the flatness is allowed upto 0.1mm. That means tolerance zone is two parallel surfaces separated by 0.1mm and the produced surface must be with in this tolerance zone.

2) If all the surface elements are with in the tolerance zone, then that surface is considered as datum-A. Otherwise the component is rejected.

3) Now the other surface is checked for perpendicularity with respect to datum surface A. Here the tolerance zone is two parallel planes separated by 0.01mm and these planes oriented at 90⁰ with respect to datum-A. The actual produced surface is expected to be within this tolerance zone.

4) If all the surface elements are with in the tolerance zone, then that surface is considered as datum-B. Otherwise the component is rejected.

5) Positional tolerance is given to axis of holes. So the tolerance zone is cylinder with diameter 0.05mm. This zone is oriented at 90⁰ to datum surface and located at specified distances. The produced holes axes must lie with in this zone.