unit 5
carriage
contains the saddle and cross slide
headstock
contains the spindle
enlarge a hole to specified size
why is boring done?
centers
work mounted on a mandrel is usually machined between ______.
cutting speed
________ indicates the distance the work moves past the cutting tool per minute.
feed
________ is the distance the cutter moves longitudinally along the ways during a single revolution of the work.
sine
a ________ bar is a very accurately machined bar that is used in conjunction with gage blocks and sine tables to precisely measure angles.
expansion
a __________ mandrel permits work with openings that vary slightly from standard size to be turned.
b
a boring bar is positioned _________ for machining. a) above center b) on center or slightly below center c) below center d) none of the above
holder
a boring bar should extend from the tool ______ only far enough to do the job.
dead center
a pilot hole should have a diameter equal to the larger drill's ______.
b
a taper is a section of material that _______. a) is bell shaped b) increases in diameter at uniform rate c) increases or decreases in size d) none of the above
d
always check the thread pitch after the first light cut with a _____. a) half nut b) rule c) screw pitch gage d) both b and c
1/4 the speed used for conventional turning
at what spindle speed are screw threads cut?
maximum support
boring can be done more efficiently if the largest boring bar possible is used. why is this recommended?
d
boring is an internal machining operation _______. a) in which a single-point tool is used to enlarge a hole b) employed to enlarge a hole to a specified size c) that produces a hole concentric with the outside diameter of a workpiece d) all of the above
d
collets can _____. a) cneter work automatically b) maintain accuracy over long periods of hard usage be c) expensive because a different size collet is needed for each different size or stock shape d) all of the above
tailstock
contains the dead center and supports the outer end of the work
feed change levers
controls the operation of power feeds, regulates the distance of tool travel per spindle revolution
feed mechanism
controls the operation of power feeds, transmits power through train of gears, regulates the distance of tool travel per spindle revolution
quick change gearbox
controls the operation of power feeds, transmits power through train of gears, regulates the distance of tool travel per spindle revolution
d
cutter bits are ground to cut _____. a) to the left only b) to the right slightly c) in either direction d) it depends on the tool
cemented carbid
cutting speeds can be increased 300 to 400% by using _________ cutting tools.
distance from one point on a thread to a corresponding point of the next thread
define pitch as it applies to thread terminology.
a
drills over ______ in diameter require a pilot hole. a) 1/2" b) 1/4" c) 1/10" d) none of the above
half-nut
engaged for thread cutting
remove burrs, round off sharp edges, blend in form
filing on a lathe should be kept to a minimum. when is filing recommended?
b
for all ______, close the half nut at any numbered line on the thread dial. a) even numbered threads b) odd numbered threads c) threads involving one half of a thread in each inch d) threads involving one-fourth of a thread in each inch
c
for all ______, close the half nuts at any odd numbered line on the thread dial. a) even numbered threads b) odd numbered threads c) threads involving one half of a thread in each inch d) threads involving one-fourth of a thread in each inch
lathe bed
foundation of the lathe
cover with canvas
how should a lathe be protected when using a tool post grinder?
b
if the cutting speed is too high, _______. a) less time will be needed to complete the job b) the cutting tool will dull rapidly c) a lighter cut will have to be made d) all of the above
a
if the live center on a lathe does not run true, the work will have diameters that are _____. a) eccentric b) concentric c) out of round d) all of the above
grinding and setting the tool bit in position
in machining terminology, what is a fishtail and what purpose does it serve?
index plate
indicates how to position levers for cutting various pitch thread and feed
b
lathe size is determined by the _______. a) bed length b) swing and length of the bed c) largest diameter work that can be turned d) all of the above
turret
limited production runs are sometimes produced on a manually operated __________ lathe.
c
never attempt to part stock that is held _____. a) in a 3-jaw chuck b) mounted between centers c) in a 4-jaw chuck d) none of the above
pitch
on a single thread, the lead and _______ are the same.
acme
on the _______ thread, the top and bottom are flat, but the sides have a 29 degrees included angle.
b
parting is the operation of ______. a) removing a rough section of stock b) cutting off material after it has been machined c) facing stock with a special cutting tool d) non of the above
a
reaming is an operation used to produce a hole ______. a) accurate in diameter and improved surface finish b) that is slightly oversize c) closer to specified size d) all of the above
b
round and hexagonal stock will center automatically in a 3-jaw universal chuck because _______. a) it works like a collet chuck b) the jaws move simultaneously c) it has a centering device d) all of the above
d
screw threads have many uses, including ______. a) transmitting motion b) making measurements c) making adjustments d) all of the above
d
slower speeds with greater power are obtained on some lathes by _______. a) dialing in a slower speed b) changing drive belt position c) engaging back gear d) all of the above
center points
tailstock offset can be determined visually by measuring the distance between the ________, or between the witness lines on the base of the tailstock.
c
the ______ must be known to measure thread accuracy with a thread micrometer. a) major diameter b) minor diameter c) pitch diameter d) all of the above
left hand
the _________ method of filing is the safest way to file on a lathe.
follower rest
the ___________ provides support directly in back of the cutting tool and moves along during the cut.
small
the automatic screw machine has been developed for the high speed production of large numbers of __________ parts.
b
the chief function of any lathe, no matter how complex, is to ______. a) turn any shape work b) rotate the work against a controllable cutting tool c) cut threads d) all of the above
a
the face of the thread dial rotates when the half nuts are ______. a) not engaged b) engaged
carriage
the follower rest bolts to the __________.
lead screw
transmits power to the carriage through a gearing and clutch arrangement
back gears
used to obtain slower spindle speeds on belt driven lathes
spindle
various work-holding attachments are fitted to it
compound, offset tailstock, taper attachment, tool bit, and reamer
what are the five ways of machining tapers on a lathe?
taper angle or taper per inch
what information must be known in order to cut a taper using a taper attachment?
external and internal tapers can be cut
what is one advantage a compound rest offers when used to cut tapers?
distance a nut will travel in one complete revolution
what is referred to as lead on a screw thread?
tracing or duplicating
what is sometimes used when several identical pieces must be produced?
b
when boring with ling, slender boring bars, chatter may occur but can usually be eliminated by _______. a) using a higher spindle speed b) reducing tool overhang c) placing the tool slightly above center d) all of the above
a
when cutting inch base even numbered threads, the half-nuts can be engaged at any _____ on the thread dial. a) line b) numbered line c) odd number line d) none of the above
b
when cutting inch base odd number threads, the half nuts are engaged at _______ on the thread dial. a) any line b) any numbered line c) pitch diameter d) none of the above
center
when cutting sharp V-threads, a _______ gage is used for grinding the cutter and setting it in position.
taper
when drilling on a lathe, drills larger than 1/2" in diameter usually have ______ shanks.
provides gripping surface, change appearance, increase work diameter
why is knurling done?
micrometer
an accurate setover can be made by using the ________ dial on the compound rest or cross slide or a dial indicator.
rest
angular cuts can be made using the compound _______.
d
approximate alignment of lathe centers can be determined by checking _______, a) centers visually by bringing them together b) witness lines at the base of the tailstock c) diameters on a sample turned section d) all of the above
d
cutting left hand threads requires ______. a) that the carriage travels towards the tailstock b) changing the lead screw rotation c) pivoting the compound to the left d) all of the above
d
the finish cut brings the work to _____. a) the required diameter b) the required surface finish c) size using high spindle speed, a sharp cutting tool, and fine feed d) all of the above
pitch diameter
the imaginary diameter at the point where the widths of the screw thread and groove are equal
major diameter
the largest diameter of thread
c
the lathe operates on the principle _____. a) of the cutter revolving against the work b) that the controllable cutting tool can be moved vertically across the work c) of the work revolving against the controllable cutting tool d) all of the above
c
the longest piece of work that can be turned between centers is equal to the length of the bed minus the space taken up by the ______. a) cutter b) tailstock c) headstock and tailstock d) none of the above
c
the most accurate method for cutting tapers is the _____. a) compound rest b) offset tailstock c) taper attachment d) all of the above
c
the most accurate way to offset the tailstock center is to _____. a) measure the distance between center points b) measure the distance between the witness lines on tailstock base c) use a dial indicator d) all of the above
set over
the offset tailstock method for turning tapers is also known as the _______ tailstock method.
d
the size hole to be bored determines the _______. a) front clearance on the cutting tool b) type and size boring bar required c) depth of cuts d) all of the above
minor diameter
the smallest diameter of a thread
d
the spindle on a lathe is hollow and tapered internally to _______. a) allow the use of a knockout bar b) receive tools and attachments with taper shanks c) permit long stock to be turned without dangerous overhang d) all of the above
1/3
the spindle speed when performing a parting operation is about _________ the speed used for conventional turning.
b
the steady rest and follower rest are used to ______. a) reduce or eliminate chatter when long shafts are machined b) support long slender work c) prevent work from springing d) all of the above
ways
the steady rest is bolted directly to the _________.
d
the tailstock ________. a) is essential for drilling operations on a lathe b) permits taper turning to be done c) is necessary to support long work being turned d) all of the above
b
A _______ chuck can hold irregular shape work as each jaw has individual movement. a) 3-jaw universal b) 4-jaw independent c) jacobs d) all of the above
d
a tool post grinder permits the lathe to be used ______. a) for internal and external grinding b) to sharpen reamers and milling cutters c) to true lathe center d) all of the above
d
there are a number of factors that must be considered when determining the correct cutting speed and feed rate, including the _______. a) cutting tool material b) kind of material being machined c) condition of the lathe d) all of the above
internal thread
this thread is cut on inside surface of piece
external thread
this thread is cut on outside diameter of piece
1/# of threads per inch
what is pitch equal to?
a
when facing stock, a rounded "nubbin" of face material results if the cutting tool is _______. a) slightly above center b) slightly below center c) dull d) none of the above
b
when facing stock, a square shoulder "nubbin" of face material results if the cutting tool is _______. a) slightly above center b) slightly below center c) dull d) none of the above
d
when reaming on the lathe use a(n) _______. a) cutting speed about 2/3 that of a similar size drill b) slow, steady feed c) adequate supply of cutting fluid d) all of the above