Unit 4 Processes

The included angle of a drill point sharpened for general drilling is _____ degrees.

118

A drill with a taper shank too large to fit the spindle taper can be made to fit the spindle by using a _____. A. socket B. sleeve C. drift D. all of the above

A

Countersinking is a machining operation that _____. A. prepares the hole to receive a flat head screw B. prepares the hole to receive a socket or fillister head screw C. machines a circular spot on a rough surface for a bolt head or nut D. all of the above

A

Internal broaching uses a _____. A. pull broach B. slab broach C. pot broach D. all of the above

A

A twist drill works by _____. A. being forced into the material B. rotating against the material and being pulled through by the spiral flutes C. rotating against the material with sufficient pressure to cause penetration D. all of the above

B

Counter-boring is a machining operation that _____. A. prepares a hole to receive a flat head screw B. prepares a hole to receive a socket or fillister head screw C. machines a circular spot on a rough surface to receive a bolt head or nut D. all of the above

B

Internal broaching requires a _____. A. flat toothed cutting tool B. starting hole C. large cutting tool D. all of the above

B

The broaching operation removes metal _____. A. at the same rate as other machining processes B. faster than most other machining techniques C. slower than many other machining techniques D. all of the above

B

Water-based cutting fluids must never be used when machining _____. A. aluminum B. magnesium C. brass D. all of the above

B

When a drill point is ground off center and has unequal point angles, the drill will _____. A. drill a hole the same size as the drill but have a very rough surface finish B. probably drill an out-of-round hole or break C. drill a hole the same size as the drill D. all of the above are possible

B

Cutting speed of a drill is the _____. A. number of revolutions per minute it turns B. distance the drill advances into the work per revolution C. distance the cutting edge circumference travels per minute D. all of the above

C

Drill press size is determined by the largest _____. A. size drill that will fit the machine B. section of material that will fit the table C. diameter work that can be drilled on center D. all of the above

C

Feed that is too rapid will cause the drill to _____. A. chatter B. scrape instead of cut C. jam with chips D. all of the above

C

In pot broaching, the cutting tool _____. A. is pushed through the work B. requires a starting hole C. is stationary and the work is pulled through it D. all of the above

C

Spot-facing is a machining process for machining _____. A. prepares a hole to receive a flat head screw B. prepares a hole to receive a socket or fillister head screw C. machines a circular spot on a rough surface for a bolt head or nut D. none of the above

C

Broaching is a manufacturing process for machining _____. A. flat, round, and contoured surfaces B. internal and external surfaces C. metals that are difficult to machine by other machining techniques D. all of the above

D

Broaching is a very useful machinging technique in that _____. A. consistently close tolerances can be maintained B. small parts can be stacked and shaped in a single pass C. it can remove metal faster than almost any other technique D. all of the above

D

Semi-chemical cutting fluids _____. A. dissipate heat rapidly B. are clean to use C. leave a residue that is easy to remove D. all of the above

D

How is broaching accomplished?

a mulittoothed cutting tool is pushed or pulled across the work

What does internal broaching require that external broaching does not?

a starting hole so that the cutting tool can be inserted

Why is drill cutting speed also known as peripheral speed?

because it is the distance the drill's cuttinf edge circumference travels

When should a reamer be removed from a finished hole?

before stopping the machine

What is dangerous about using compressed air to cool the area being machined?

blows chips into the air

Continued use of a dull drill may result in drill breakage or _____.

burning

How can you tell when a drill is properly sharpened?

chips will come out of the flutes in curled spirals of equal size and length

Straight shank drills are used with a _____.

chuck

Step Drill

eliminates drilling operations

Three and Four Flute Core Drills

enlarging drilling operations

Describe the hole produced by reaming?

extremely accurate in diameter and have an exceptionally fine surface finish

The slab broach is a _____ toothed strip cutting tool.

flat

The sprial grooves that run the length of a drill body are called _____.

flutes

Half Round Straight Flute Drill

for drilling brass, copper alloys, and nonferrous metals

Tang

found on the end of taper shank drills

Drill diameters can be checked with a micrometer or a drill _____.

gage

Compressed air is the most commonly employed _____ coolant.

gaseous fluid

Oil-Hole Drill

has coolant holes in body

Spade Drill

has replaceable tips and is less expensive than twist drills of the same size

A drill _____ permits holes to be drilled in a number of identical pieces and makes it unnecessary to layour each hole.

jig

When a micrometer is used for measuring drill, the measurement is made across the drill _____ unless the drill is worn.

margins

What are the four basic types of cutting fluids?

mineral oils, emusifiable oils, chemical and semichemical fluids, gaseous fluids

Taper Shank

must be mounted in a chuck

What are the four series of sizes for drill bits?

numbers, letters, inches and fractions, metric

Chemical cutting fluids generally contain no _____.

oil

Indexable Insert Drill

only the insert is replaced when the tool dulls

How do parallels prevent a drill from damaging a vise?

parallels level the work and raise it above the vise base, allowing the drill to come through the work

What are the three principal parts of a twist drill?

point, shank, body

List the three kinds of teeth on a broaching tool.

roughing, semifinishing, finishing

Emulsifiable oils are also known as _____ oils.

soluble

When should v-blocks be used?

support round work for drilling

_____ shank drills fit directly into the drill press spindle.

taper

Lip Clearance

the amount the surface of the point relieved back from the cutting edge

Drill Point

the cone-shaped end of the drill that does the cutting

Chuck

the cutting edge of a drill

Lips

the cutting edge of a drill

What does the term feed indicate in drilling?

the distance the drill moves into the work with each revolution

Margin

the marrow strip extending back the entire edge of each flute

Web

the metal column that separates the drill flutes

Body

the portion of the drill between the poiint and the shank

Heel

the portion of the point back from the lips or cutting edges

Dead Center

the sharp edge at the extreme tip of the drill

The cutting speed of a high-speed steel reamer is approximately _____ times that of a similar size high speed steel drill.

two-thirds