Machine Tech Mid-Term

In general, cutting speed is reduced for ______.

hard or abrasive materials

The bent-tail standard dog ____.

has the setscrew exposed

A bent-tail safety lathe dog ____.

has the setscrew recessed

Treat all small cuts and skin punctures as potential source of infection and

have the injuries treated promptly, clean them thoroughly, report such injuries to your instructor

The longest piece of work that can be turned between centers is equal to the lenght of the bed minus the space taken up by the ______________.

head stock and tail stock

Facing cuts can be made ________.

in either direction

When preforming internal grinding on the lathe, the work and the grinding wheel must rotate _____________.

in opposite directions

Boring is an internal maching operation____________.

in which a single point tool is used to enlarge a hole, employed to enlarged hole to a specified size, that produces a hole concentric with the outside diameter of a work piece

A milling maching is_____

is capable of machining flat and contoured surfaces, rotates a multi toothed cutter into the to remove material, is capable of machining threads, gears, and spirals

The tail stock___________.

is essential for drilling operation on a lathe, permits taper turning to be done, is necessary to support long work being turned

Cemented carbide cutters are excellent for _________.

long production runs, milling cast iron, cast steel, and bronze Selected, milling machines with a scale like surface

With climb or down milling, the work _.

moves in the same direction as cutter rotation

The lathe operates on the principle ____.

of the work revolving against the controllable cutting tool

A boring bar is positioned ____________ for machining.

on center

Dimensions are needed to produce a _.

part.

A toolmakers universal vise _________.

permits compound or double angles to be cut

Staggered-tooth side milling cutters have right hand and left hand helical teeth that _____.

produce a good surface finish because of the alternating right and left shearing action

The steady rest and follower rest are used to _______________-.

reduce or eliminate chatter when long shafts are machine, support long slender work, prevent work from springing or bending away from the cutting tool

When boring with long slender boring bars, chatter may occure but can be elminated by____________.

reducing tool overhang

Lathe filing is not intended to ____.

replace a dull cutting tool, repair a surface made by a dull cutting tool, and improve the surface finish

The chief function of any lathe, no matter how complex, is to ___________.

rotate the work against a controllable cutting tool

A machinist can compare some surface finish with required specifications by employing a surface ___________ Finish with required specifications by employing a surface standard.

roughness comparison

The Woodruff key seat cutter is used to mill ___________.

semicircular key-seats

The finish cut brings the work to ____.

size using high spindle speed, a sharp cutting tool, and fine feed, the required diameter, and the required surface finish

When facing stock, a rounded "nubbin" of face material results if the cutting tool is ______________.

slightly above center

When facing stock, a square shoulder "nubbin" of the face material results if the cutting tool is ______________.

slightly below center

Cutting speed is increased for _________.

soft materials, better finishes, light cuts

Assembly and _ drawings provide the information necessary to correctly fit the various parts together. Assembly and

sub-assembly drawings provide the information necessary to correctly fit the various parts together.

Lathe size is determined by the ____.

swing and length of the bed

If the cutting speed is to high, ____________________.

the cutting tool will dull rapidly

Safety glasses should be worn___________.

the entire time you are in the shop

Henry Maudslay designed and constructed___________.

the first lathe capable of cutting accurate screw threads This answer is incorrect, the grand daddy of all modern chip making tools, a slide rest that allowed the cutting tool to be accurately re-positioned.

Round and hexagonal stock will center automatically in a 3-jaw universal chuck because________________.

the jaw moves simultaneously

A ____ is seldom used on modern lathes.

threaded spindle nose

The worktable on a plain milling machine is capable of movements in ____ directions

three

Angular surfaces can be machined by___________.

tilting the spindle head, setting the work in the vise at the required rotation, using a fixture to position the work

The style C arbor is _.

used to hold smaller size shell end and face milling cutters

Holes may be located to very close tolerances for drilling on a vertical milling machine with a __________

wiggler, edge finder, centering scope

Side milling cutters are _

Available with cutting edges on one or both sides, made in solid form or with inserted teeth, recommended for straddle milling

The Lathe operates on the principle of:

The work rotating against the cutting tool, which is controllable

The spindle on a lathe is hollow and tapered internally to

Allow the use of a knock out bar, receive tools and attachments with tapered shanks, Permit long stock to be turned with out dangerous overhang

________ are made with a two-flute end mill.

Blind holes and Closed keyseats

Fire extinguishers identified by a green triangle are for extinguishing _________.

Class A fire

Fire extinguishers identified by a red sqare are for extinguishing _____________.

Class B fires

Fire extinguishers identified by a blue circle are for extinguishing _______

Class C fires

Fire extinguishiers identified with a yellow star are for extinguishing __________.

Class D fires

Rapid traverse feed on a milling machine provides

Fast power table movement in any direction of feed engagement

A universal milling machine can be moved in _____ directions.

Fast power table movement in any direction of feed engagement, This is the correct answer, faster table movement during the machining cycle, That higher cutting speeds can be activated when needed

A tool post grinder permits the lathe to be used _______________________?

Foe internal and external grinding, to sharpen reamers and milling cutters, to true lathe centers

Cutter bits are ground to cut_____.

It depends on the work being done

Plain milling cutters have ____ teeth

Straight

Straddle milling involves_________.

a pair of side cutters machining opposite sides of he work at the same time

Spark out is a term associated with grinding on the lathe and means ____________.

a point where the grinding wheel moves back and forth across the work until it no longer cuts

A fixed bed milling machine is characterized by

a worktable that moves only in a longitudinal direction, vertical movements that are obtained by moving the cutter head. cross feed that is obtianed by moving the cutter head

The spindle on the lathe is hollow and tapered internally to _________.

allow the use of a knock out bar, receive tools and attachments with taper shanks, permit long stock to be turned without dangerous overhang

Cutters with high abrasion resistance__________.

are not affected by the terrific heat that can be generated during machining, do not rapidly break down during machining, have cutting edges that do not wear down rapidly due to the abrasive nature of some materials

If a lathe dog binds on the faceplate slot, the piece being turned will ________________.

be pulled off center, be eccentric with the center hole, not be concentric with the corner hole

Before attempting to operate a machine tool, you should ___________.

be sure all guards are in place, have received instructions in its safe operation, determine that the machine is in safe operating condition Selected:

The ______dog has the set screw exposed.

bent-tail standard

The jaws on a 3-jaw universal chuck ____.

cannot be reversed to hold larger diameter work

A style B arbor is _.

characterized by the large bearing collar that can be positioned at any place on the arbor

HSS milling cutters can be improved by the application of ______.

coatings such as chromium or tungsten, lubricating treatments, surface hardening treatments

Parting is the operation of ____.

cutting off material after it has been machined

Measurments of the finished bevel gear are made of the.

depth of tooth, blank size and shape, tooth thickness

If the live center on a lathe does not run true, the work will have diameters that are ________.

eccentric

The size hole to be bored determines the ____.

front clearance on the cutting tool, type and size boring bar required, and depth of cuts

The tail stock

is essential for drilling operations on a lath, permits taper turning to be done, is necessary to support long work being turned

With conventional or up-milling, the work ___________.

is fed into the rotating cutter

Avoid using compressed air to clean chips from machine tools because ___________.

it can create a dangerous environmental situation, flying chips may cause eye injuries, it could create a dangerous mist that might be injurious to your health

If a spindle of a vertical milling machine is not perpendicular to the worktable,________________.

it will not be possible to machine a flat surface

Milling feed is the ________.

rate at which work moves into the cutter

Drawings made other than actual size are called _ drawing. Drawings made other than actual size are called

scale drawing

When determining whether or not a lathe toolholder is a right or left hand model, you can hold the head of the tool in your hand and note the direction the shank points. The shank of the left hand toolholder points__________.

to the left

When a helical slab mill is used, mount it so yhe cutting pressure forces it _________.

toward the column

On a horizontal milling machine, a small diameter cutter is more efficient than a large diameter cutter because it ____________.

travels less distance while doing the same amount of work

When a vise is used to mount work,______.

wipe the vise base and worktable clean, inspect it for burrs and nicks, bolt it firmly to the table

Climb milling should not be performed on machines _____________.

without play in the table, that are not in top condition, not fitted with an anti-backlash device

The largest piece that can be turned between centers is equal to

The length of the bed minus the space taken up by the head stock and the tail stock.

Slab cutters are made with _ teeth.

helical

Formed milling cutters ____________.

. include corner rounding cuttersThis answer is incorrect, include concave and covex cutters, can be used to duplicate a contour

The back gear on a Lathe system.

Provides slower speeds with greater power.

The ______ dog has the set screw recessed.

bent-tail safety

Drills over___________ in diameter requires a pilot hole.

1/2"

Cemented tungsten carbides can be operated at speeds __________ than conventional HSS cutting tools.

3-10 times faster

A _________ chuck can hold irregular shape work as each jaw has individual movement.

4-jaw independent

The ____dog is used for turning square or rectangular work

Clamp-type

Cutter bits are ground to cut ____.

It depends on the tool.

Arbor cutters can be mounted _____.

None of the above

Reaming is an operation used to produce a hole ______.

accurate in diameter and improved surface finish

When boring on a lathe, ____.

additional front clearance must be ground on the cutting tool to avoid rubbing

When reaming on the lathe, use a(n) ____.

adequate supply of cutting fluid, slow, steady feed, and cutting speed about 2/3 that of a similar size drill

When machining magnesium, it is important to remember that _________.

applying water will intensify burning magnesium chips, magnesium chips will burn with great intensity, the material should be handled with care

Spindle speeds and table feeds on a milling machine may be changed ______.

by shifting v-belts or by adjusting variable speed pulley, electronically, by using quick change gears

The swivel vise _________.

can be locked at any angle to the spindle

The jaws on a 4-jaw independent chuck ________ to hold larger diameter work.

can be reversed

Collets can ____.

center work automatically, maintain accuracy over long periods of hard usage, and be expensive because a different size collet is needed for each different size or stock shape

Aproximate alingment of lathe centers can be determined by checking _________.

centers visually by bringing them together, witness lines at the base of the tailstock, diameters on a sample turned section

Slitting is a milling operation that_____________.

cuts thin stock into strips of various width, is preformed with a thin saw like milling cut, gives best results if the cutter is mounted for climb milling

With face milling, the surface being machined is parrallel with the ____

cutter face and Periphery of the cutter

The term HAND is used with end mills to discribe______.

cutter rotation and the helix of the flutes

There are a number of factors that must be considered when determining the correct cutting speed and feed rate, including the ____________.

cutting tool material, kind of the material being machined, condition of the lathe

If extreme accuracy is required on the vise held work, align the solid vise jaw with a ___.

dial indicator, precision square, combination set

Slower speeds with greater power are obtained on some lathe by_____________.

dialing in a slower speed, changing drive belt position, engaging back gear

The swing of the lathe indicates the largest ____________.

diameter work that can be turned over the ways

A proper drawing includes all _ in proper relation to one another needed to make the part. A proper drawing includes all

dimensions Correct. in proper relation to one another needed to make the part.

Milling cutting speeds refers to the ____.

distance a tooth on the cutter circumference moves in one minute

If the cutting speed is to slow, _______________.

extra time will be needed to complete the job

When a slot is wider than the cutter diameter and the cutter is removing work from one side of the work,it is important that _________________.

feed direction is normally against cutter rotation

The style A arbor is

fitted with a small pilot that runs in a bronze bearing in the arbor support