Practice exercise

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This is a practice exercise video solution for this practice exercise.

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We'll be taking a look at the supply detail drawing 123 block drawing dot PDF.

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It's important that we're able to identify datas and feature control

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frames on detailed drawings when planning out our machining operations.

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So the first thing that we want to do is identify data A B and C.

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So we can know their location in reference to the part.

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Next,

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we want to make sure that we can view each of

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the feature control frames and identify the symbols within them.

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There are many different GD and T symbols and these are only three of them.

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But if we take a look at the

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feature control frame here listed as a positional tolerance

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with a tolerance value of 0.0002

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relative to data B and C,

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this is letting us know that the position of these holes

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are tightly controlled relative to both sides of the part.

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As we look at it from the top view.

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Even though datum C is placed on the front view,

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we can still identify it based on the fact that we know the projection of our part.

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And in this case, this detailed drawing has listed views for front top and right.

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Also let's take a look at the

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next feature control frame which list perpendicularity.

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This has a similar tolerance 0.0002

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relative to data B.

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This means that the top face of the part must

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be perpendicular to the side face referenced by data B

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within that tolerance value.

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And last, let's take a look at the third data.

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This gives a parallelism.

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In this case, we need to make sure that the face listed for the feature control frame

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stays parallel to datum. A again with a tolerance of 0.0002.

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These are all important aspects because they'll

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determine how you not only hold your part

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but also how you machine it and the order of operations that you decide to create.

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In this case, a 123 block is a highly tolerance controlled part,

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but we're not going to be machining this part per se.

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It's just important that we identify these features on the detailed drawing.

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So that way we can use them when planning our own parts.