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