Chapter 21 MACHINING OPERATIONS AND MACHINE TOOLS
21.12 The twist drill is the most common type of drill bit: (a) true or (b) false?
a
21.16 The distinguishing feature between a drilling fixture and a drill jig is that the fixture provides a means of guiding the tool during the hole-making operation: (a) true or (b) false?
false
21.8 A live center is one way of holding a workpiece in the headstock of a lathe, whereas a dead center is used to hold the work in the tailstock: (a) true or (b) false?
Answer. (b). Both live centers and dead centers are used in the tailstock. The live center rotates with the work whereas the dead center does not rotate.
21.11 Most vertical boring machines are equipped for both turning and boring and are used for large, heavy work parts with large diameters: (a) true or (b) false?
a
21.6 Boring and reaming share the common feature that they are both used to enlarge an existing hole: (a) true or (b) false?
a
21.7 Knurling is performed on a lathe, but it is not a metal cutting operation: (a) true or (b) false?
a
21.9 Which one of the following cutting tools cannot be used on a turret lathe: (a) broach, (b) cutoff tool, (c) drill bit, (d) single-point turning tool, or (e) threading tool?
a
21.19 A vertical milling machine is more appropriate than a horizontal milling machine for performing which of the following types of operations (three best answers): (a) end milling, (b) face milling, (c) peripheral milling, (d) plain milling, (e) slab milling, and (f) surface contouring?
a b and f
21.4 A lathe can be used to perform which of the following machining operations (three correct answers): (a) boring, (b) broaching, (c) drilling, (d) milling, (e) planing, and (f) turning?
a c and f
21.13 When the drill bit in a drilling operation exits the opposite side of the work, the resulting hole is called which one of the following: (a) a blind hole or (b) a through hole?
b
21.20 The basic milling machine is which one of the following: (a) bed type, (b) knee and column, (c) profiling mill, (d) ram mill, or (e) universal milling machine?
b
21.23 A broaching operation is best described by which one of the following: (a) a rotating tool moves past a stationary workpart, (b) a tool with multiple teeth moves linearly past a stationary workpart, (c) a workpart is fed past a rotating cutting tool, or (d) a workpart moves linearly past a stationary single-point tool?
b
21.25 Which one of the following terms is used for cutting external threads using self-opening threading dies: (a) tapping, (b) thread chasing, (c) thread forming, or (d) thread milling?
b
21.26 Gear hobbing is a special form of which one of the following machining operations: (a) grinding, (b) milling, (c) planing, (d) shaping, or (e) turning?
b
21.3 In a turning operation, the change in diameter of the workpart is equal to which one of the following: (a) 1 x depth of cut, (b) 2 x depth of cut, (c) 1 x feed, or (d) 2 x feed?
b
21.5 A facing operation is normally performed on which one of the following machine tools: (a) drill press, (b) lathe, (c) milling machine, (d) planer, or (e) shaper?
b
21.21 Typical operations performed on a machining center include which of the following (two best answers): (a) boring, (b) drilling, (c) milling, (d) sawing, and (e) turning?
b and c
21.2 Which of the following are examples of generating the workpart geometry in machining, as opposed to forming the geometry (two best answers): (a) broaching, (b) contour turning, (c) drilling, (d) profile milling, and (e) thread cutting?
b and d
21.15 Reaming is used for which of the following functions (three correct answers): (a) accurately locate a hole position, (b) create a stepped hole, (c) enlarge a drilled hole, (d) improve surface finish on a hole, (e) improve tolerance on hole diameter, and (f) provide an internal thread?
b d and e
21.17 Which of the following are classified as peripheral milling rather than face milling (three best answers): (a) end milling, (b) plain milling, (c) pocket milling, (d) slab milling, (e) straddle milling, and (f) surface contouring?
b d and e
21.24 The three basic types of sawing, according to type of blade motion involved, are which of the following: (a) abrasive cutoff, (b) bandsawing, (c) circular sawing, (d) contouring, (e) friction sawing, (f) hacksawing, and (g) slotting?
bc and f
21.10 Which one of the following turning machines permits very long bar stock to be used: (a) chucking machine, (b) engine lathe, (c) screw machine, (d) speed lathe, or (e) turret lathe?
c
21.1 Machined parts can be classified as rotational or nonrotational. Which of the following are examples of operations that create nonrotational geometries (two best answers): (a) boring, (b) drilling, (c) milling, (d) planing, and (e) turning?
c and d
21.14 A tap is a cutting tool used to create which one of the following geometries: (a) external threads, (b) flat planar surfaces, (c) holes used in beer kegs, (d) internal threads, or (e) square holes?
d
21.22 A planing operation is best described by which one of the following: (a) a single-point tool moves linearly past a stationary workpart, (b) a tool with multiple teeth moves linearly past a stationary workpart, (c) a workpart is fed linearly past a rotating cutting tool, or (d) a workpart moves linearly past a single-point tool?
d
21.18 The difference between up milling and down milling is that in down milling the direction of motion of the cutter teeth is opposite the feed direction when the teeth cut into the work: (a) true or (b) false?
false