1
Q
What band saw blade type would be best for a job requiring many pieces of steel bar needing to be cut in a band saw and needs to be cut as quickly as possible without concern for cut surface finish?
A
Straight/alternating set
The street set leaves of rougher cut. It is the quickest for cutting. The wavy set is a design for cutting thin material like piping or tubing. If a smooth cut is needed. The best choice would be the Raker set.

2
Q
Which of the following and mills are capable of plunge cutting?
A ) Recessed edge
B) blunt pointed
C) centre cutting
D) non-center cutting
A
C) centre cutting
In order to be able to plunge cut and end mill must have cutting edges that span across the centre (centre cutting) of the cutting face and mills that are non-cutting centre are limited to peripheral cutting and cannot plunge.
3
Q
What tripod should be employed when setting up a precision automatic level outdoors?
A
Fibreglass
Tripods are commonly found constructed in one of three main materials, aluminum fibreglass and wood. Each of these has their own advantage and disadvantage.
Aluminum - good for lightweight moisture/humidity. Not good for thermal changes.
Fibreglass - good for lightweight resistance to thermal changes and moisture and humidity resistance.
Wood - resistant to the thermal changes, but not good for humidity/moisture and is heavy
4
Q
What is the threaded angle of an imperial thread?
A
60 degrees
5
Q
A mechanic must remove or ease the brittleness created by the hardening process in a steel work piece before it can be used what process must be performed on the workpiece to accomplish this?
A
Tempering
Tempering is the process of heating hard and steel to just below a lower critical temperature and then cooling the steel by quenching relieves the internal stresses and brittleness created by the hardening process
6
Q
How does the helix of an end mill help the cutting process?
A
Allows for smooth cutting
The helix ensures that there is always a cutting edge on the workpiece, allowing for smooth material removal and finish a straight flute would have periods of time with no contact and them full contact. This would create vibration and poor surface finish.
7
Q
How many complete threads will be cut in a 7/8 inch plate when tapping a 9/16–12 threaded hole ?
A
10
9/16–12 has 12 threads per inch the plate is 7/8 inch thick therefore the 7/8 of the thread will be cut. This means the hole in the plate will have 7/8×12 which equals 10.5 threads or 10 complete threads.
8
Q
What additive is key for hypoid gear drives
A
Extreme pressure (EP) additives
9
Q
What direction is a left Hand end mill intended to cut?
A
Clockwise
10
Q
Where should the spark guard placement be on a pedestal/bench grinder?
A
The spark guard should be no further than 1/4 inch (6mm) away from the grinding wheel
11
Q
What is the carbon content of steel with the code 4140?
A
0.40%
12
Q
It is noticed that a punch and die set is producing excessive burrs. What would be the most probable cause?
A
Dull tooling
Rollover or burrs are commonly caused by dull tooling.
13
Q
When cutting piping with a bandsaw, how should the cut/feed rate be adjusted?
A
Reduce the cutting/feed rate by 50%
Cut/feed rate is measure in square inches per minute. The rate at which of a blade is fed into a material depends on how manufacturers first being what is the material made of the initial feed rate is based on material after this is based on material thickness/shapes initial feed rate should be adjusted based upon this in the following
Structural steel – reduce cutting feed raped by approximately 25%
Piping – reduce cutting feed right by approximately 50%
Tubing – reduce cutting feed right by approximately 65%
This reduction is necessary to reduce the tooth load when cutting this section of material
14
Q
A 1 inch shaft is secured by a lathe jaw with 6 inches sticking out and the tail stock centre cannot be used what would be used to prevent shaft wobble
A
Steady rest
Steady rest are employed with a work piece secured in the truck, but cannot be connected to a tail stock centre would wobble due to the length of stick out. The rule of thumb is if the length is sticking out of the jaw is more than three times the shaft diameter a steady rush should be employed.
Similar to a follow rest in construction, except that it provides three supporting jaws and is attached to the late bed
15
Q
How are tapered/angled cuts on a contour band saw achieved
A
The workpiece can either be blocked and clamped on an angle or the work table can be tilted
16
Q
What is the most probable outcome of using a feed rate on a milling operation that is too slow
A
Premature cutter dulling
17
Q
What oil additive would be employed in applications where heavy loads are expected
A
EP
In heavy load of applications oils will have EP or extreme pressure additives
18
Q
What twist drill is best suited for soft material such as aluminum, magnesium or zinc?
A
High helix drill

19
Q
Is a non-center cutting and mill capable of plunge cutting?
A
No
20
Q
Describe a Ferris metal
A
Ferris metals are any metal that contains more iron than any other metal in the mix
21
Q
The tendency for a material to fracture and break with a little or no defamation is known as what
A
Brittleness
22
Q
Given the thread code 1/2 - 12 UNC - 3B LH what does “B” refer to?
A
B - internal thread
23
Q
The belt on a drill press is making a squealing noise on startup what is the most probable cause?
A
The belt drive lacks sufficient tension
24
Q
When cutting structural steel with a bandsaw, how should the cut/feed rate be adjusted?
A
Reduce the cutting/feed rate by 25%
25
Given the thread code 1/2 - 12 UNC - 1B LH which of the following does the 1 represent?
The 1 represents a loose thread fit.
26
A mechanic is in the process of turning a portion of a shaft down to 1.255” on a lathe. The shaft is currently 1.267”. How much should the mechanic advance the tooling to cut the shaft to the desires diameter?
0.006".
When turning a diameter on a lathe, the cut will be double whatever the tooling advancement is because the shaft is spinning and both sides of the shaft is being machined
27
A Center Punch has which of the following included angles ground into it's point?
90 degrees
28
What hole conditions require a spiral fluted reamer?
Slotted hole.
When reaming a hole that is keyed or slotted a spiral fluted reamer must be used to ensure that all cutters are always engaged while reaming. If a straight fluted reamer is used it could get jammed or cause chatter which could damage the hole.
29
When drilling, what can be done to minimized the the grabbing and resulting burr as the drill breaks through?
Decrease spindle speed.
Cutting speeds and feeds can be calculated for all material for drilling. However, when breaking through with a drill bit the bit tends to grab on the last remaining edge and leave a burr. This can be minimized by slowing the spindle speed for the last portion of the hole
30
What cutting methods produces the best surface finish when using a conventional mill?
Climb milling
In climb milling material chips are removed and pushed behind the advancing cutter minimizing the chance of re-cutting, which causes marred surface finish
31
What process would a hardened work piece have to undergo to make it soft and machinable again?
Annealing
Hardened metal must undergo Full Annealing to soften the metal to make it workable
32
When cutting without cutting fluid with a band saw, how should the speed be adjusted?
Reduce the Cutting Speed by 40-50%
Cutting fluid is used to accomplish the following:
Reduce friction while cutting (limiting heat generation)
Cool the workpiece and blade during cutting
Flush chips and debris away from blade and workpiece
Cutting speeds are typically based on coolant being used. When the coolant is not used the speed should be reduced by 40-50% to limit the potential heat generation. If speeds are not reduce for dry cutting the blade life will be reduced significantly.
33
When drilling mild steel, which include angles is employed?
118
General purpose drilling such as into mild steel drill induced angles are typically 118°. When drilling into harder material the included angle is increased to 135°.
34
What are the two distinct ways to cut material when Milling?
Conventional and Climb.
The two distinct methods of cutting material when milling are:
Conventional Milling
Climb Milling
With Conventional Milling the the cutter cuts up through the material slowly building the chip thickness from nothing.
With Climb Milling the cutter cuts downward into the base material begin with a maximum chip thickness and slowly reducing the chip to nothing.
35
When using a drill bit with a vertical mill, which is the must commonly employed tool holder?
Drill chucks.
When using drill bit on a vertical mill, drill chucks are used most often because of their rapid change ability
36
What should be done when drilling soft materials such as brass with a standard 118⁰ drill bit to limit "gabbing" ?
Slightly hone or grind the cutting edge to reduce the rake angle to zero.
Drill bits should have their cutting edge (Rake Angle) ground down or honed down to prevent grabbing.
37
What is an acceptable RPM for an Edge Finder to operate accurately.
900 RPM.
Edge finders work best in a range of 800-1000 RPM
38
What would be used to square a thread cutting tool bit to a work-piece on a lathe.
Center Gage.
Centering gages are used to center cutting tools to the work-piece.
39
The ability for grease to resist deformation (stiffness) while a force is applied is referred to as?
Consistency.
The ability of a grease to resist deformation (stiffness) when a force is applied to it is known as its Consistency. Grease consistency is represented by an National Lubricating Grease Institute (NLGI) number
40
What quenching mediums cools materials the fastest?
Brine
Brine cools the fastest, followed by water then oil and last air. Which medium is used depends upon material being quenched
41
When milling hot rolled steel which milling methods is recommended to prevent cutting edge chipping?
Conventional milling.
Hot rolled steel has a very hard black surface that will chip the cutting edges if engage too aggressively. Therefore conventional milling is recommended of climb milling.
42
An industrial mechanic is required to some tubing on a band saw. Which blade sets would be the most appropriate for this task?
Wavy set.
Flare set is not real. Raker set allows for quick smooth cuts. Straight set allows for the quickest cutting but leaves a rougher surface. The wavy set cuts thin materials and materials with changing cross-section like tubing best.
43
When cutting 1/4" cold rolled steel with a power hacksaw, what would be the minimum blade pitch required?
12
For smooth accurate cuts the blade must have at minimum 2 to 3 teeth in contact with the workpiece at all times. Less will cause the teeth to snag the leading edge of the workpiece. This snagging will lead to a jagged and inaccurate cut as well as damage to the blade.
For our example of 1/4" workpiece:
For 2 Teeth contact we would require a Pitch of 2 teeth x 4 (1 inch has 4 @ 1/4") = 8 TPI
For 3 Teeth contact we would require a Pitch of 3 teeth x 4 (1 inch has 4 @ 1/4") = 12 TPI
44
When referring to End Mills, "Hand" indicates what?
Flutes helix and cutter rotation direction.
Hand refers to the direction of cutter rotation (for cutting) as well as the direction of flute helix.
45
When comparing Hot Rolled to Cold Rolled Steel how do their edges differ?
Hot rolled steel edges are rounded and cold rolled steel is squared.
Hot Rolled Steel
Process
The steel is rolled at high temperatures (over 1700ºF/927ºC). These temperatures are higher than the crystallization temperature allowing it to be shaped easily.
Characteristics
Scaled surface
Rounded edges
Slight irregularities
More ductile/malleable/tough than cold rolled
Cold Rolled Steel
Process
Hot rolled steel that has cooled to room temperature and rolled.
Characteristics
Cleaner surface finish (aesthetically pleasing)
Squared edges
Better dimensional accuracy
Harder and stronger than hot rolled
46
What damage occurs to the Striking End of Punches and Chisels with use?
Mushrooming.
47
How is damage to the striking end of punches and chisels repaired?
Rotated on a grinding wheel until damage is removed and a slight bevel is applied (approx. 45 degrees).
48
The most common working holding device employed with vertical mills is which?
Vise
The most common working holding device employed with vertical mills is a vise because of its speed and ease of employment.
49
When viewing the oil level of a machine through a Columnar Sight Glass, which of the following best describes when oil should be added?
When the oil level drops below the lower marker.
Columnar Sight Glasses typically employ two or three markers/lines. These markers/lines are often color coded "o" rings. The markers are usually employed as the minimum and maximum level indicators. The lower level marker is set when the equipment is not operating or cold. Oil is added when the level reaches the lower level marker. The upper level marker is set when the equipment is at operating temperatures.
50
What hole conditions require a spiral fluted reamer?
Keyed hole
51
EP additives containing active sulfur should be avoided with equipment which contain components made of which materials?
Brass or bronze.
In heavy load applications, oils will have EP or extreme pressure additives. These additives minimize the welding of surface asperities, reducing wear during periods of surface to surface contact when boundary film lubrication is broken. Some EP additives that employ sulfur can causing serious damage to brass and bronze components such as worm gears. Therefore, care should be taken to determine compatibility prior to application
52
When using a vertical bandsaw which of the following blade pitches would be used to cut 3/8” thick material?
8
Always select a saw blade as coarse as possible for efficiency. Three teeth must be in contact with the work at all times or the work can be caught in the space between the teeth ( gullet).
3/8 pitch is equal to 0.375” for a minimum of three teeth to be in contact we would divide the pitch by to two to get the maximum space between teeth 0.375/3 = 0.125
Now if we divide the maximum space into the one inch, we will have the minimum pitch
1/0.125 = 8.
53
Which direction is a Right Hand End Mill intended to cut?
Counter-clockwise
54
Which heat treatment processes is employed to relieve the strains and irregular grain structure in metal that has been worked (hammered, drawn, etc)?
Normalizing
Normalizing is the process of remove strain and irregular grain structure from a piece of steel. This is achieved by heating the piece above the upper critical temperature and then air cooled.
55
The schematic symbol above represents which view point?
First angle projection.
56
When working with a milling machine arbor best describe a Brown and Sharpe taper?
These tapers have a nominal taper of 1/2" per foot.
57
What are the speeds and feeds when using reamers?
½ the twist drill speed and 2 times the feed
Nominally, holes should be reamed at approximately ½ of the drilling rpm and 2x the feed rate, The exact numbers will vary slightly depending upon the material being cut and diameter of the hole.
58
What would be true of an oil with a higher viscosity compared to an oil with lower viscosity?
a.
The equipment will have more leaks.
b.
All offered here.
c.
The equipment will operate cooler.
d.
The equipment will consume more energy.
D.
The equipment will consume more energy.
As viscosity of an oil increase the following will be found:
Greater the load capacity
Greater power consumption of the equipment due to greater fluid friction (resistance to flow)
Greater heat generation due to fluid friction
Greater sealing properties of the fluid
59
A Type L spindle nose taper has which taper
3.5" per foot
60
Which of the following does NOT have an impact on the thickness of the Hydrodynamic Film in the loaded area?
a.
Shaft RPM.
b.
Shaft Load.
c.
Oil Viscosity.
d.
Bearing Material.
D.
Bearing Material.
With Hydrodynamic Lubrication an oil wedge lifts the shaft, and supports it with a full film of lubrication. Before rotation the shaft will rest on the bearing surface with only a Boundary Film of lubrication. As the shaft begins to rotate oil will be dragged under it causing the shaft to begin to lift creating a partial film separation. Once the shaft is up to speed, the shaft will drag enough oil under the create a full film of separation.
The thickness of the Hydrodynamic Film separation depends upon 3 key factors:
Oil Viscosity
The RPM of the shaft
Shaft Load
61
What best describes Milling Feed?
The rate at which the work is fed into the cutter.
Milling feed is the rate at which the work is fed into the cutter when milling. This feed is measured in Inches per minute
62
Which drill helix angles would be best for limiting "grabbing" when drilling brass?
Helix angle of 12° or less.
63
best describe a Ferrous Metal?
Ferrous metals are any metal that contains more Iron than any other metal.
64
What would be employed when selecting a bandsaw blade for cutting a contour?
The widest blade that will cut the smallest radii required
Ideally the widest blade that is capable of cutting the smallest radii is selected. This ensures that the contour can be cut and that the blade has the maximum strength possible.
65
What grease thickeners produces a grease that is the most water resistant?
Lithium.
Oils are typically mixed with a metallic based soap to produce it's semi-solid consistency. Lithium based thickeners provide the most water resistance and are the most commonly employed grease.
66
How is the angle of cut adjusted on a vertical band saw?
The work table is adjusted.
67
When looking at the cutting end of a right hand end mill, which direction does it rotate when cutting?
Counter-clockwise.
68
What Steel Carbon contents is not able to be through hardened
0.25%
Carbon Steel refers to a steel in which carbon affects the properties of a steel more than any other element. Carbon Steel is found in 3 main categories:
Low-Carbon Steel
0.05% to 0.30% Carbon
Ductile, Machinable and Weldable
Can only be cased hardened (cannot be through hardened)
Medium-Carbon Steel
0.30% to 0.60% Carbon
Greater tensile strength, more challenging to machine and weld
Can be hardened
High-Carbon Steel
0.60% to 1.7% Carbon
Hard and wear resistant
More difficult again to machine and weld to to hardening
69
A series of 3/4" holes need to be drilled into mild steel. Given that cutting speed for this material is 85fpm, at what R.P.M. should the holes be drilled?
453 rpm.
The formula for drilling RPM is RPM = Cutting Speed x 4/Diameter of Cutting Tool.
Therefore, RPM = 85 x (4/(3/4)) or 85 x 5.333 = 453 RPM
70
When using a lathe which of the following dogs engage the via bar/stud to the drive plate?
Straight Tail Dog
Dogs can be found with bent or straight tails. Straight tails engages a bar/stud that is secured to the drive plate. A bent tail engages the drive plate directly by being inserted in a slot on the plate.
71
Which type of friction offers the lowest resistance to motion?
Fluid Friction.
72
What characteristic of a thread does a Thread Micrometer measure?
Pitch Diameter
Thread micrometer are designed to measure the Pitch Diameter of a thread.
73
What is a quick field test for determining if a a punch is sharp?
Fingernail test.
74
When machining a spacer washer thickness a mechanic would use what machine tools?
Surface grinder
75
What best describes shear strength?
A materials ability to withstand forces to cause the material the slide against itself in a plane parallel to the opposing forces.
76
When using a Wick Feed Oiler, what causes the oil to be fed to it's intended location?
Capillary Action.
Wick Feed Oilers employ capillary action to deliver the oil to the intended location. These oilers are typically limited to smaller bearings (friction and anti-friction)
77
A long, small diameter shaft must be cut to diameter on a lathe. Which of the following would be employed to help with the shaft deflection while being cut?
Follower/Follow Rest.
Follower Rests are used when the cutting force would deflect the workpiece.
Similar to a Steady Rest in construction, except that it provides only 2 supporting jaws and is attached to the lathe carriage. Because it moves with the carriage the Rest supports the workpiece the length of the cut (preventing deflection).
78
A machine base-plate is being levelled using a 12" calibrated precision level. The plate has a center of bolt to bolt distance of 72". The level required 0.014" of shims to be levelled. How much shim is required to level the base-plate?
0.084
The base-plate bolt center distance to level length ration is 72/12 or 6:1. Therefore the plate will require 6 time the number of shims to level as that of the level. The base-plate will require 0.014 x 6 = 0.084" to level it.
79
Occasionally dimensions on a drawing will be provided in both Imperial and Metric. best describes how these dimension are displayed?
One system (usually metric) will be displayed within parenthese
80
best describe the chemical make up of Steel?
Steels contains iron with less than 2% carbon.
81
A work platform needs to be leveled using an optical Automatic Level. The left side of the platform must remain at its current elevation and the leveling rod reading at this location is 295.3 cm. The right side of the platform has a leveling rod reading of 273.5 cm. What must be done to level this platform?
The right side must be lowered by 21.8 cm.
The right side reading is less by 295.3 - 273.5 = 21.8 cm. When one reading is less than another it means that the actual elevation is higher than the other. In this case the right side is higher by 21.8 cm.
82
Whats the most reasonable unit of feed rate for a milling operation?
Inches per minute
Feed rates are expressed in distance per period of time. Therefore it will not be based on revolution. Also a feed rate of Meters per second is not practical (excessively fast). Therefore, the best answer would be inches per minute.
83
When tramming in a milling vise, where do you run the indicator?
The Solid Jaw.
Always tram in the solid jaw of the vise for consistency (since it doesn't move)
84
Which is the most common anti-foam additive in oils
Silicone.
The most common anti-foam (foam depressant) additive is silicon. Silicone particles are suspended throughout the oil (A). When a bubble forms particles of the inhibitor will make their way to the bubble (B). The silicone has a very low surface tension and cause the bubble to rupture at the location of the inhibitor particle (C).
85
Which shank styles are twist drills found in?
Straight or tapered
Twist drills have either straight or tapered shanks. The tapered shank is a Morse taper which has a taper of 5/8" per foot. Tapered shanks have a greater driving capacity (slip resistance) than straight.
86
Given the thread code 1/2 - 12 UNC - 3B LH what does the 3 represent?
The 3 represents a close thread fit.
87
Based on the steel codes given below, which is capable of being hardened?
a.
4116.
b.
4102.
c.
4112.
d.
4130.
D. 4130
All the steels identified by the codes above have their carbon content in percentage identified (1/100 of a percent) by the last two digits. Therefore 4116 would have a carbon content of 16/100 = 0.16%. For steel to be hardened it must have a minimum carbon content of 0.20%
88
When the work piece edge is found while using a 0.200" Edge Finder on a vertical mill, how far off is the spindle center line from the edge of the work piece?
0.100"
Edge finders will wobble in all directions when not touching the part. As the edge finder gets closer to the part it will begin to straighten out more and more until it is perfectly aligned. As the edge finder is brought just past the edge of the part it will go off-center to one side. When backed up and performed again (much slower) to confirm where the finder goes off center, the edge is found. However half of the edge finder diameter must be accounted for. Therefore, the spindle center is in fact, 0.100" off the edge.
89
What would be employed when selecting a bandsaw blade for cutting a contour?
The widest blade that will cut the smallest radii required.
Ideally the widest blade that is capable of cutting the smallest radii is selected. This ensures that the contour can be cut and that the blade has the maximum strength possible.
90
describes how an Outside Micrometer is "Zeroed"?
The micrometer sleeve is rotated until the reading/datum line and thimble zero align.
Zeroing an Outside Micrometer
Confirm the the Anvil and Spindle faces are clean
Close the micrometer using the Ratchet Stop
If the Reading/Datum Line and the Thimble Zero do not line up, the micrometer must be zeroed.
Lock the spindle location
Using a pin spanner, turn the micrometer sleeve until the reading/datum line and zero are aligned.
Release the lock
Open and reclose the micrometer with the ratchet stop
Confirm zero
91
What is used to confirm the calibration/accuracy of an Outside Micrometer?
Gage blocks.
The calibration of an out side micrometer is accomplished with the following steps:
Confirm the micrometer is in good working order - the thimble spins freely, not obvious damage
Close the micrometer and zero the micrometer
Measure a t least 3 different gage blocks to verify the micrometer reads correctly
Gage blocks are precision ground hardened steel blocks with known/identified dimension at a set temperature. Feeler gages have very accurate dimension, but are limited in thickness and not quite as accurate as gage blocks
92
When looking at a drawing employed in Outside of North American industry (particular the United States), which systems of measure is typically employed?
Metric system of measurement
93
6" tapered key measures 1/2" at the larger end. What should the smaller end measure?
0.4375".
tapered keys consist of taper 1/8 inch over 12 inches this key would therefore taper (6/12) x (1/8) or 0.0625 over its length. The smaller end would have a measurement of 0.5 - 0.0625 = 0.4375"
94
Given the Spark Tests shown above. Which of the following would most likely give off the spark shown in D.
High Speed Steel
Gray Cast Iron
Color - Red at grinder easing to orange straw at extensions.
Length - 20 to 25 inches
Form - Small with many sprigs
Low Carbon Steel
Color - White
Length - 60 to 70 inches
Form - Long shafts that end in forks and appendages. As carbon content increases the appendages decrease, forks increase and sprigs begin to form.
High Carbon Steel
Color - White
Length - 50 to 55 inches.
Form - Large volume of sprigs emanating from shafts.
High Speed Steel
Color - Straw
Length - 55 to 60 inches.
Form - Long shafts that end in buds with some breaks with arrows.
95
It is noticed that a punch and die set is dulling faster than expected. What should be checked?
Tooling/Equipment alignment
96
What additives aid in separating oil and water?
Demulsifier
When oil allows water to mix with it it is known as emulsible. This mixture will cause equipment corrode, diminish the load capacity of the oil to a point where there can be metal to metal contact, increase foam and a number of other problems. Demulsifiers promote the separation of the water from oil allowing it to be drained off.
97
A mechanic needs to provide a work-piece with a slotted hole to accommodate adjustment when the piece is installed. Which machine and tools would be the most appropriate for accomplishing this task?
Vertical mill with an end mill
98
Which of the following Brinell hardness below would be hardest to file?
A. 100
B 500
C 300
D 50
B 500
The higher the brinell rating the harder the material. Therefore the higher the number the harder to file
99
best describe when Fume Extractor filters are changed?
After recommended hours or when indicator displays
extractor filter replacement is typically based on operation time (hours of operation). The duration varies from manufacturer to manufacturer, however most recommended a change cycle of 150 to 300 hours OR when the filter indicator (Light/Alarm/Gage) goes off
100
On drawings, best describes how are angles typically given?
Angles are typically provided as decimal degrees or in degrees, minutes and seconds.
101
Dropping Point of a grease is an indication of what?
thermal/heat resistance of the grease
Drop / Dropping Point of a grease is the lowest temperature at which the lubricant/oil will begin to separate from the thickener and drip from a grease. This measurement is an indicator of the grease temperature/heat resistance.
102
Given the Spark Tests shown above. Which of the following would most likely give off the spark shown in B.
Low Carbon Steel.
103
What part of a thread identified by the letter E is known as what?
Thread Angle
104
lubrication process where the rotation of a shaft drags oil under it to form an oil wedge causing the shaft to be lifted and supported by a film of lubrication is known as what?
Hydrodynamic Lubrication
105
106
best describes tensile strength?
A materials ability to withstand being pulled apart by opposing forces in a straight line.
107
The part of a thread identified by the letter A is known as what?
Thread Pitch.
108
A fastener which fits into a groove on a shaft commonly employed to hold components onto a shaft are known as?
Retaining Ring
Retaining rings are fasteners that installed into a groove on a shaft or into a groove on a circular bore. These fasteners are designed to hold other components in place
109
The point at which a material permanently deforms while subjected to stress/force is known as what?
Yield point.
The point at which a material is permanently deformed due to the stress it is being subjected to is known as the yield point
110
best describes how a Steel with a carbon content of 0.25% can be hardened?
Case Hardening.
Carbon Steel refers to a steel in which carbon affects the properties of a steel more than any other element. Carbon Steel is found in 3 main categories:
Low-Carbon Steel
0.05% to 0.30% Carbon
Ductile, Machinable and Weldable
Can only be cased hardened (cannot be through hardened)
Medium-Carbon Steel
0.30% to 0.60% Carbon
Greater tensile strength, more challenging to machine and weld
Can be hardened
High-Carbon Steel
0.60% to 1.7% Carbon
Hard and wear resistant
More difficult again to machine and weld to to hardening
111
Prick Punch has which included angles ground into it's point?
30 to 60 degrees
112
Which thread type can accommodate the highest load in one direction?
Buttress
113
describe compressive strength?
A materials ability to withstand forces reducing it in size.
114
Given the mechanical drawings cross hatch patterns above what material would best represent B?
Steel
115
When drilling hardened steels, which include angles is employed?
135
General purpose drilling such as into mild steel drill induced angles are typically 118°. When drilling into harder material the included angle is increased to 135°.
116
describes the Filter Rating for fume extractor filters?
MERV (Minimal Efficiency Reporting Value).
117
When comparing Hot Rolled to Cold Rolled Steel which is harder?
Cold rolled
Hot rolled steel is not as hard as cold rolled steel
118
Low temperature/freezer grease is most commonly made from which mineral base oil?
Naptha
cold environments, mineral based Naptha or Synthetic based oil are employed to maintain viscosity.
119
When using a lathe which of the following dogs engage the drive plate directly?
Bent Tail Dog
Dogs can be found with bent or straight tails. Straight tails engages a bar/stud that is secured to the drive plate. A bent tail engages the drive plate directly by being inserted in a slot on the plate
120
What can be employed to line up a mill spindle with a prick punch mark?
Pointed edge finder.
121
What’s the amount of change in an oils viscosity as its temperature changes called?
Viscosity Index
122
Given the mechanical drawings cross hatch patterns above what material would best represent C?
Brass / Bronze
123
When performing a chisel test on a piece of metal the chips are smooth and long with a shiny silver color. What metal is it most likely?
Aluminum
124
Which oilers are used as a Once-Through Gravity Feed oiler?
Drip Feed Oiler
Drip Feed Oilers use gravity to direct the oil where needed. These oilers are known as a Once-Through oiler since the oil is not used again after the initial application. Wick oilers employ capillary action to feed the oil. Ring and Constant Level oilers use the oil over and over.
125
When viewing the oil level of a machine through a Bullseye Sight Glass, best describe when oil should be added if there are no indication lines?
When the oil level drops below the center point of the sight glass.
126
When comparing Hot Rolled to Cold Rolled Steel, which has a scaly finish?
Hot rolled steel surface is scaly and cold rolled steel is smooth.
127
Carbon steel with a carbon content of 0.55% would be referred to as what?
Medium-Carbon Steel
Carbon Steel refers to a steel in which carbon affects the properties of a steel more than any other element. Carbon Steel is found in 3 main categories:
Low-Carbon Steel
0.05% to 0.30% Carbon
Ductile, Machinable and Weldable
Can only be cased hardened (cannot be through hardened)
Medium-Carbon Steel
0.30% to 0.60% Carbon
Greater tensile strength, more challenging to machine and weld
Can be hardened
High-Carbon Steel
0.60% to 1.7% Carbon
Hard and wear resistant
More difficult again to machine and weld to to hardening
128
The part of a thread identified by the letter D is known as what?
Thread Root
129
Where should the oil level be maintained for an anti-friction bearing?
1/3 - 1/2 the lowest rolling element
130
What heat treatment processes is employed to reverse the effects of hardening and make a piece of steel soft again?
Annealing.
131
The Woodruff keyway on a shaft measures 0.3125". Which key code could fit this?
1008
Woodruff keys are identified by a three or four digit code. The first two digits give the width of the key in 1/32” the last two digits give the nominal diameter of the key in eights.
Since the width is 0.3125" the width (W) would be .3125x32 = 10 and the diameter (B) would be 1" = 8/8ths or 08. This would give us the key code of WxB or 1008.
WD40
132
Carbon steel with a carbon content of 0.25% would be referred to as what?
Low-Carbon Steel
133
When referring to Bolt specifications, UNC stands for what?
Unified Course Thread
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