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Dec 6, 2023

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Machine Trades Print Reading 2022 Short Answer Unit 1 13. What is the difference between detail drawings and assembly drawings? Answer: Detail drawings provide all the necessary information needed to produce a part, and assembly drawings identify each part and show how they fit together. 14. Why are print reading skills valuable to a machinist? Answer: Machinists interpret information on prints to determine processes, tools, and operations needed to produce the part. Unit 2 13. Name the six principal views created by orthographic projection. Answer: Front view, rear view, right-side view, left-side view, top view, and bottom view. 14. Why is it critical to know what projection method is used when reading a drawing? Answer: If the reader does not know what projection method is used, they will interpret the details incorrectly. This can lead to costly manufacturing errors. Unit 3 23. In the image provided, surface 5 in the top view is represented by what line in the front view? Answer: 27 Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 1
24. In the image provided, line 35 in the right-side view is represented by what surface in the front view? Answer: 43 25. In the image provided, what type of line is B? Answer: Visible line Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 2
26. In the image provided, what type of line is A? Answer: Hidden line 27. In the image provided, line 29 in the front view corresponds to what line in the top view? Answer: 10 Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 3
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28. In the image provided, line 14 in the top view corresponds to what line in the right-side view? Answer: 35 Unit 4 18. Why are large drawings typically folded down to an A-size? Answer: Storing and identifying large drawings is difficult, so folding them down to the smallest size keeps the name and drawing number accessible from the outside of the folded drawing. 19. When reading the dimensions of an object, why is it important to use the dimensions listed on the drawing rather than scale them from the drawing? Answer: The dimensions listed on the drawing are always the actual size of the object. Scale only reflects the size of the object in relationship to the drawing. It is common for drawings to be printed at a different size than the original, which makes the scale of the object no longer accurate. Unit 6 35. When is it appropriate to use a small hole gage to measure a slot? Answer: If it is too small to be measured with inside calipers or a telescoping gage. Unit 7 23. When are limits beneficial? Answer: Limits are beneficial when a dimension’s value cannot exceed a maximum value and cannot be less than a minimum value Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 4
24. What is the difference between a specified tolerance and an unspecified tolerance? Answer: A specified tolerance is directly applied to a dimension, while an unspecified tolerance appears in a general note and applies to a dimension that does not have a specified tolerance. Unit 8 18. Using the drawing provided, what is the dimension of the fillet? Answer: R.062 .062 Unit 11 20. When is a detailed representation typically used? Answer: When additional information is needed, such as for new forms or modified threads. 21. What are UNEF threads used for? Answer: They are used for special applications requiring finer thread, such as thin wall tubing, nuts, and couplings. Unit 13 14. Which of the lines shown in the illustration is a correct example of a cutting-plane line? Answer: A Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 5
15. Which drawing shows the preferred practice? Answer: C Unit 15 25. List three benefits of GD&T. Answer: Any three of the following: Helps clarify production requirements and verify that tolerance requirements have been met, helps reduce drawing changes, increases productivity, and avoids accidental scrapping of functional parts. Unit 17 11. List two reasons why hidden lines may be useful on an assembly drawing. Answer: In any order: 1) In limited use, hidden lines can aid in the clarification of edges and contours. 2) Hidden lines may be necessary for the correct placement of parts in the assembly. Copyright by The Goodheart-Willcox Co., Inc. May not be posted to a publicly accessible website. 6
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