Machine Tool Practices, 11e (Kibbe)
Section I – Turning Machines
1) A spindle nose on a lathe is generally one of three designs:
A) Screw lock, tapered-key drive, bore-lock
B) Camlock, threaded, or long taper key drive
C) Key-lock, camlock, threaded taper
D) None of the above answers are correct
2) Another name for the feed reverse lever is: lead screw direction control lever.
3) The lathe carriage is made up of the saddle and apron.
4) The quick-change gearbox is the link that transmits power between the spindle and the
carriage.
5) Gibs on a lathe can be adjusted.
6) Paper is often used to get the correct gap between feed change gears.
7) Lathes typically do not have slack or backlash in the crossfeed screw and compound screw.
8) The half-nut lever is used only for thread cutting and never for feeds for general turning.
9) Tool holders are used to:
A) Deflect the cutting pressure
B) Protect the tool
C) Securely clamp the tool
D) Extend the life of the tool
10) Excessive tool overhang:
A) Causes excessive tool wear
B) Will result in chatter
C) Will change top rake and end clearance angles
D) Cause tool overheating
11) On a standard left hand toolholder:
A) The cutting tool end is bent to the right
B) There is no back-rake angle
C) No end clearance is provided
D) The cutting tool end is bent to the left
12) A straight toolholder with the square hole parallel to the base:
A) Allows precise tool height adjustments
B) Is used with high speed steel tools
C) Is used in quick-change tooling
D) In used with carbide tools
13) Tool height adjustments on a quick-change toolholder are made:
A) Grinding the tool
B) With a micrometer collar
C) With shims
D) With a rocker
14) A turret type tool post normally:
A) Use standard toolholders
B) Use quick-change toolholders
C) Holds 6 different tools
D) Holds 4 different tools
15) A standard right hand toolholder is best for turning:
A) Close to the tailstock
B) Small diameter workpieces
C) Close the headstock
D) For heavy cutting
16) Tool height adjustments on a turret type toolholder are made with:
A) A rocker
B) Set screws
C) Shims
D) A micrometer collar
17) Tools are secured in the tailstock spin spindle:
A) With a quick-change holder
B) With a spindle clamp
C) By their Morse taper shanks
D) With a set screw
18) Straight shank tools are held in the a tailstock with:
A) A Collet
B) Set screws
C) A taper sleeve
D) A drill chuck
19) High speed steel (HSS) tools are:
A) Easily shaped into desired forms of tools
B) Used by machinists more often than any other kinds
C) Often used on machines that are capable of operating only at high RPM
D) Able to withstand higher temperatures than other kinds of cutting tools such as carbides
20) Form tools produce a specially shaped machined surface by:
A) Plunging into the workpiece to produce the form of the tool
B) Exerting great pressure on the work and embossing it
C) The use of special attachments for the lathe
D) Using a template of the form and a single point tool
21) The most important aspects of a lathe tool are:
A) When they get overheated in the cut, they are ruined and must be replaced
B) The fact that they can be re-sharpened when they wear or break
C) The ability to be shaped into desired form
D) The tool geometry, including end, side relief and rake angles
22) What is a “chip trap”?
A) Too many chips are allowed to accumulate in the chip pan and on the floor, making a
dangerous “chip trap” for the operator
B) An improperly ground tool or one that has been re ground many times often has a “chip trap”
that prevents a smooth flow of chips across the tool face
C) A wad of stringy chips wrapped around the chuck or workpiece is know as a “chip trap”
D) A “chip trap” is simply a chip disposal device
23) Back rakes should be ground on the tool:
A) When the toolholder is of the straight type without a built in back rake
B) At the angle given in Table 1 for turning various metals
C) At the same time the side rake is ground
D) All of the above
24) A threading tool should:
A) Be checked with a drill gage
B) Be ground to offset any built in back rake from the holder, thus giving it zero rake
C) Have no side relief angle
D) Have a negative rake since it has a tendency to “dig in”
25) The purpose of side and end relief angles are:
A) To carry the chip away from the point of cut
B) To insure uniform even chip flow across the tool face
C) To relieve the pressure of cutting from the point of the tool and divert it to a stronger part of
the tool
D) The side relief allows for feed into the work and the end relief provides clearance for the tool
so it will not rub
26) Back and side rakes:
A) Provide adequate clearance between the workpiece and the tool
B) Are both the same with different names
C) Carry the chip away from the point of cut and insure uniform even chip flow across the face
of the tool
D) Relieve the pressure of the cutting tool from the point of the cut and divert it to a strongest
part of the tool
27) Chips can be made manageable and safe to the operator by using:
A) A piece of wood to break them into smaller chips
B) A hook tool to remove them as soon as they are produced and by wearing gloves to protect
your hands
C) Feeds and depths of cut that contribute to chip breaking and by using chip breakers on tools
D) Large back rake and side rake angles on tools to contribute to the smooth flow of an even
uniform chip
28) A high speed (HSS) lathe tool would have to be above 1300 F. (704 C.) to be overheated. A
temperature of 2000 F. (1093 C.) could be produced on the cutting edge when grinding by:
A) Too little pressure on the tool
B) Using the roughing wheel for finishing
C) Using a glazed wheel or by forcing the tool into the wheel
D) Using a wheel that is too coarse
29) Chucks and face plates are mounted on the spindle by means of:
A) Any one of several types of spindle noses
B) A permanent assembly
C) A circle of socket head screws
D) Interchangeable spindle noses
30) The long threaded long taper key drive and camlock are terms used to describe:
A) The lead screw and related mechanisms
B) Various types of spindle noses
C) Screws and slide mechanisms on the carriage of the lathe
D) Part of the drive mechanism in the head stock
31) The independent chuck has:
A) A special adjusting system that makes the jaws center round work more accurately
B) Four jaws, each of which can move independently without affecting the position of the others
C) Three jaws that move independently of each other
D) Two, three or six jaws that all move in or out an equal distance
32) The universal chuck has:
A) Four jaws, each of which can move without affecting the position of the others
B) A special adjusting system that makes the jaws center round work more accurately
C) Three jaws that move independently of each other
D) Two, three or six jaws that all move in or out an equal distance
33) The combination chuck:
A) Can be a four-jaw chuck in which the jaws can be moved independently
B) Is a four-jaw chuck with top jaws
C) Can be a three-jaw chuck with a scroll plate, but each jaw does not have an adjusting screw
for independent action
D) Is a three-jaw chuck held in the jaws of a four-jaw chuck
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34) Drive plates usually have:
A) One single slot
B) One or several slots
C) T-slots
D) T-slots and straight slots
35) Live centers are:
A) Soft material
B) Made with carbide inserts
C) Hardened
D) Hardened and annealed
36) What are face plates used for?
A) Driving shafts between centers with a lathe dog
B) Facing operations only
C) Mounting fixtures and workpieces
D) None of the above
37) A drive center or face driver makes possible the:
A) Driving work between centers so that a cut can be taken full length
B) Driving of tubular material without chucking it
C) Facing off the rough end of a shaft or in the case of a drive center, the truing up of the center
by a kind of reaming
D) Driving of a face plate
38) Steel spring collets are used:
A) In automatic machines only
B) For centering and turning irregular shaped objects
C) For turning small precision parts made from standard sized bar stock
D) To turn large heavy shafting
39) Speed changes are made on geared head lathes with:
A) Automatic transmissions
B) A single shift lever mounted on top
C) Several shifting levers on the headstock
D) Shifting levers with synchro-mesh making possible the shifting up and down with the motor
running
40) The lead screw is reversed by shifting the:
A) Left hand thread lever
B) Lead screw reversing lever
C) Feed change lever
D) Feed reverse lever
41) The feed change lever:
A) Diverts the feed to either the cross slide or the carriage
B) Changes the feed to a high or low range
C) Connects or disconnects the carriage handwheel
D) Changes the direction of the lead screw
42) The sliding gear shifter levers on the quick-change gear box are used for:
A) Quickly change speeds
B) Quickly changing feeds during a cut to get a varied finish
C) Selecting feeds or threads per inch
D) Changing the ratio between the longitudinal feed and the cross feed
43) The carriage handwheel:
A) Has a micrometer dial that is sometimes in metric units as well as English units
B) Should never be used except in an emergency
C) Is used for a quick approach and return and for delicate operations not requiring power feed
D) Is used for feeding when coarser feeds are required and when long cuts are made on shafts
44) What effect do you think the carriage feed/cross feed ratio would have on surface finish if
the same feed setting is used for turning both the face and the outside diameter surfaces?
A) It would be making threads per inch on the longitudinal and feeds on the facing surface
B) The facing surface would be coarser and the outside diameter surface would be finer
C) The outside diameter surface would be coarser and the facing surface would be finer
D) None, they are the same
45) The half-nut lever is used for:
A) Threading
B) Engaging the longitudinal feed on the carriage
C) Changing from longitudinal to cross feed
D) Taking up the slack in the cross slide nut
46) Micrometer collars on the cross feed and compound feed handles are graduated in:
A) Degrees and minutes
B) Tenths of inches
C) English and English-metric units
D) Fractions of inches and in centimeters
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47) A lathe that is calibrated for single depth:
A) Will take off one-half the amount turned on the dial from the diameter of the workpiece
B) Will take off the amount turned in on the dial from the diameter of the workpiece
C) Only reads in English units and not in metric units
D) Will take twice the amount turned on the dial from the diameter of the workpiece
48) In which kind of chuck is square or rectangular work set up for center drilling and facing?
A) Three–jaw universal
B) Four-jaw independent
C) Collet
D) Six-jaw universal
49) When taking a facing cut on a workpiece held in a chuck, the point of the tool should be:
A) On center
B) Slightly below center
C) Slightly above center
D) Sharp with no radius
50) A right-hand facing tool is used for facing:
A) Rough work where a heavy-duty facing tool is needed
B) Centered shaft ends and sharp corners
C) Chucked shafts and large workpieces in chucks
D) The faceplate
51) The rough cutting speed for an alloy steel is 45 SFPM and the workpiece diameter is 5
inches. What is the correct RPM?
A) 562.5
B) 36
C) 65.25
D) 360
52) A workpiece is center drilled in the lathe for the purpose of:
A) Placing it on a mandrel and for turning between centers
B) Facing to the center of the workpiece
C) Turning between centers only
D) Spotting a hole for drilling or for turning between centers
53) What is the included angle of a center drill?
A) 45 degrees
B) 30 degrees
C) 60 degrees
D) 82 degrees
54) Center drills break as a result of:
A) Allowing chips to form a tangle around them
B) Too heavy feed and too low speed
C) Too light feed and too high speed
D) Dropping them on the floor
55) Drilling in too far with a center drill:
A) Damages the center drill on the tapered section
B) Makes a sharp outer edge, which is a poor bearing surface
C) Causes the chips to jam and the drill to heat up
D) Makes the taper too large
56) An advantage of turning between centers is that:
A) It produces less chatter than by other methods
B) A more positive drive is possible
C) Long work can be supported in a steady rest so facing or boring can be carried out
D) A shaft can be removed or turned end for end without loss of runout concentricity
57) Driving force is transmitted to the workpiece, when turning between centers by means of a:
A) Trip dog that automatically stops rotation at a predetermined point
B) Collet and drawbar
C) Drive plate and lathe dog
D) Three or four jaw chuck
58) Three different centers used in the tailstock are:
A) Dead, soft and ball bearing centers
B) Pipe, ball bearing and dead
C) Hard, soft and pipe centers
D) Dead, live and drive centers
59) The dead center is correctly adjusted by turning the tailstock handwheel until a resistance is
felt and then:
A) Turning in one-fourth turn
B) Backing off until the dog bent tail clicks freely in the slot
C) Stopping
D) Backing off so there is some end play
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60) The dead center needs to be frequently adjusted between cuts because the:
A) Machine adjustments often vibrate loose during machining operations, so that frequent
attention is necessary
B) Heat from machining expands the work and tightens it
C) Metal in the workpiece center wears and causes the centers to become loose
D) Lubricating oil runs out
61) Excessive overhang of the tool and toolholder:
A) Might cause the toolholder to turn in the tool post and the tool to dig in
B) Might cause a ruined thread
C) Is generally less rigid
D) All of the above
62) The cutting speed (CS) for aluminum is 200 SFPM and the workpiece diameter is 2-1/2
inches. What is the RPM setting for the lathe? The formula is RPM = CS × 4/D:
A) 3200
B) 320
C) 2000
D) 32
63) The feed rate for roughing steel should be:
A) From .003 to .005 inch
B) Between .010 and .050 inch
C) The one that gives the best surface finish
D) One-fifth to one-tenth as much as the depth of cut
64) The amount left for finishing on the diameter of a workpiece with plus or minus .003 inch
tolerance is:
A) .050 to .100 in.
B) .003 to .008 in.
C) 1/16 to 1/8 in.
D) .025 to .030 in.
65) When turning to size predictably:
A) A short skim cut is taken and measured. The crossfeed collar is zeroed, and the roughing cut
is dialed. A trial cut is taken and checked and the cut is taken. This procedure is continued to
finish size.
B) A trial cut is taken that looks like the approximate diameter or slightly over and it is checked
with a micrometer. This procedure is continued to finish the part.
C) A short skim cut is taken and measured. The crossslide feed collar is zeroed and the roughing
cut depth is dialed. A trial cut is taken and the crossfeed screw backed off after noting the setting.
The diameter is checked, the tool is returned to the start position and the dial reset to its former
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position. The cut is taken. This procedure is continued to finish size.
D) A trial cut is taken and a spring caliper is set to the size using a rule. This is sufficiently
accurate for finishing most outside diameters.
66) An out of alignment condition will cause a taper.
67) In one method of aligning centers, the center points are brought together and visually
checked for alignment.
68) The tailstock center is adjusted by means of a camlock on the bottom of the tailstock.
69) A test bar and indicator can be used to check alignment.
70) The most accurate method of aligning centers involves making a cut and measuring for a
taper.
71) If the machinist finds that the end of the work closest to the tailstock is too small:
A) The tailstock center must be moved toward the back of the machine
B) The carriage should be adjusted in a positive direction
C) The carriage should be adjusted in a negative direction
D) The tailstock center must be moved toward the front of the machine
72) Bores of machined parts such as gears and pulleys are not made by drilling in a lathe without
further machining because drills:
A) Tend to produce undersized holes that run eccentric to the workpiece axis
B) Make bell mouthed holes that must be corrected by reaming or boring
C) Tend to produce oversize holes that run eccentric to the workpiece axis
D) Are not made for standard shaft sizes
73) The main advantage of boring over reaming in the lathe is that:
A) Boring corrects any eccentricity in the bore and reaming does not
B) Better finishes are obtainable
C) Boring corrects axial misalignment and reaming does not
D) The process of finishing the bore to a precision diameter can be done more quickly
74) Three boring operations include (choose two):
A) Through boring, countersinking and drilling
B) Through boring, thread relief and knurling