Unit 9 Holes 145 Copyright Goodheart-Willcox Co., Inc. Name _______________________________________________ Date _ ________________ Class __________________ Unit Review KNOW AND UNDERSTAND Answer the following questions using the information provided in this unit. ______ 1. True or False? The ASME Y14.5 standard recommends using words instead of symbols for specifying dimensions. ______ 2. _____ is the most common machining operation. A. Counterboring B. Reaming C. Boring D. Drilling ______ 3. A _____ is a circular centerline used to locate holes in a circular pattern. A. blind hole B. bolt circle C. reamer D. counterbore ______ 4. True or False? Boring produces a straight, round hole more accurately than by drilling. ______ 5. _____ is the process of finishing an existing hole to a specific size and required finish. A. Counterdrilling B. Counterboring C. Spotfacing D. Reaming ______ 6. True or False? Countersinking is the process of enlarging a hole cylindrically to a specific diameter and depth. ______ 7. The typical specified angle for a countersunk hole on a fastener is _____°. A. 10 B. 82 C. 100 D. 182 ______ 8. _____ is the process of drilling a conical-shaped hole to a specified depth to allow a fastener’s head to sit at or below the part’s surface A. Counterboring B. Counterdrilling C. Countersinking D. Spotfacing ______ 9. True or False? Counterdrilling does not require a noted angle. ______ 10. The machining processes for spotfacing and _____ are the same, except for the depth of the spotfaced hole. A. countersinking B. counterdrilling C. counterboring D. boring CRITICAL THINKING 11. Unless a specific machining process must be noted for producing a hole, it is standard practice to dimension the hole size without indicating a manufacturing operation. Why is this standard practice in manufacturing? __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________ __________________________________________________________________________________________________________