intro to machining
What tool would be best for checking perpendicularity
Precision or Solid Square
The chart below shows the process in control
False
center lines
A line made up of alternating long and short dashes. Center lines on a print define the center, or middle, of a symmetrical part.
How would "Five Hundred Thousandths of an Inch" be written as a three place decimal
.0500
SAE 1050 steel has what percentage of carbon content
.50%
Read the dial caliper below to the nearest one thousandth of an inch. Enter your number in the format below: 1.234 Do not add additional characters or it will be counted wrong
3.666
Read the dial caliper below to the nearest one thousandth. Write your answer in the format below: 1.234 Do not add additional characters or it will be counted wrong
4.887
A part is to be machined to a length of 5.504" plus or minus 0.006". Which of the following dimensions is not acceptable
5.496
auxiliary view
A blueprint view drawn at a right angle to an angled feature of a part. Auxiliary views provide a full straight-on picture of an angled side that cannot be fully represented with a basic orthographic view.
The safest way to remove metal chips from a lathe or milling machine is to use
A brush
bainite
A combination of ferrite and cementite that is harder than pearlite. Bainite contains needlelike grain structures, and it requires an initial rapid cooling followed by gradual cooling.
pearlite
A combination of ferrite and cementite. Steel with exactly 0.8% carbon consists of uniform pearlite at room temperature.
cementite
A compound of iron and carbon that is very hard and brittle. The presence of cementite hardens steel.
basic dimension
A dimension that is theoretically perfect. A basic dimension has no direct tolerance and is denoted on a GD&T blueprint as a number enclosed in a rectangular box.
alloy
A metal consisting of a mix of two or more elements, one of which must be a metal. Steel is an alloy of carbon and iron.
brine
A mixture of water and salt. Brine cools metal faster than other quenching mediums.
profile of a line
A two-dimensional profile tolerance that describes the allowable variability in the contour of the edge seen in the section view. Profile of a line can be either an individual or a related tolerance.
stainless steels
A type of alloy steel that contains a large percentage of chromium. Stainless steels exhibit excellent corrosion resistance.
section view
A view illustrating a rotated section resulting from an imaginary cut in the part. Blueprints may contain a variety of different section views.
wrought
Bending, hammering or physically forming solid metal into a desired shape. Wrought metals are usually strong and wear resistant.
Identify this type of label:
HMIS
callouts
Information on a print that refers to a specific part feature rather than the whole part. Callouts, or local notes, communicate specifications such as chamfer angle and hole diameter.
local notes
Information on a print that refers to a specific part feature rather than the whole part. Local notes, or callouts, communicate specifications such as chamfer angle and hole diameter.
Identify this label
NFPA
This is a federal agency responsible for conducting research and making recommendations for the prevention of work-related injuries an illnesses
NIOSH
Brass would be classified as a ______ metal
Non-ferrous
A type of metal that contains no iron and is not magnetic is
Nonferrous Metal
Accidents that occur while operating a machine are usually the result of
Not paying attention
Which of the following is not an adequate PPE for a machining environment with an overhead crane and 115-dB sound levels
Prescription eyewear when walking across the shop floor
Before operating any machine for the first time, be sure you have
Proper training and approval
allotropic
The ability of a material to exist in more than one crystal structure. Temperature determines whether iron has a body-centered cubic (BCC) or face-centered cubit (FCC) structure.
shear strength
The ability of a material to resist forces that attempt to cause the internal structure to slide against itself and separate. Shear strength is the amount of shear force a material can withstand before fracturing.
tensile strength
The ability of a material to resist forces that attempt to pull apart or stretch it. Tensile strength is the amount of tensile stress a material can withstand before fracturing.
compressive strength
The ability of a material to resist forces that attempt to squeeze or crush it. Compressive strength is the amount of compressive stress a material can withstand before fracturing.
change block
The area of the blueprint indicating any changes or revisions made to the part views or dimensions. Change blocks should contain every revision, as well as the dates those revisions were made.
tempering
The heat treatment of hardened steels to temperatures below the transformation temperature range, followed by a gradual cooling process. Tempering is usually done to improve toughness.
tempering
The heat treatment of metals to temperatures below the recrystallization phase, followed by gradual cooling. Tempering can increase a material's hardness.
The X-bar chart shows a process in control
True
annealing
The steady heating of a metal above the recrystallization phase, followed by gradual cooling. Annealing can reduce hardness, improve machinablitiy, and facilitate cold working.
Unified Numbering System
UNS. A common classification system that is used for both ferrous and nonferrous metals. UNS designations include letters and numbers.
Prior to _________ a dimension, the __________ must be analyzed to determine what measuring tool should be used
cutting; sampling plan
Material becoming embedded in the teeth of a file refers to _____, and if not cleaned, could lead to poor cutting and scratches on the workpiece
pinning
An additive-enhanced, oil-based cutting fluid with excellent lubricity and good performance on drilling and tapping operations is
sulferized cutting oil
Each graduation on the thimble of an inch micrometer represents
0.001
Each graduation on the barrel or sleeve of an inch micrometer represents
0.025
What is the measurement shown on the micrometer below to the nearest thousandth of an inch? You must put a zero in front of your answer. Do not put any other characters in your answer. An example of how to enter an answer would be: 0.123 It must match exactly
0.100
Using a standard 81 piece gage block set, which combination of gage blocks would be selected to ake a gage block build of 2.8337
0.103, 0.1307, 0.600, 2.000
What is the measurement shown on the micrometer below to the nearest thousandth of an inch? You must put a zero in front of your answer. Do not put any other characters in your answer. An example of how to enter an answer would be: 0.123 It must match exactly
0.108
Which tool would work best for mesuring a 3.408" diameter shaft with a tolerance of plus or minus .001
3-4" Outside Micrometer
reference dimension
A dimension that is provided for informational purposes only. A feature is on a GD&T blueprint for reference, rather than for inspection or production use, if its dimensions are enclosed in parentheses.
orthographic view
A drawing often used for blueprints that communicates the shape and size of an object in two dimensions. Orthographic views present all the design elements of a part through a series of illustrations, each showing one of its necessary sides from a continuous perspective.
feature without size
A feature that cannot be associated with a size dimension. A single flat surface is a feature without size.
profile tolerance
A geometric tolerance that controls the size, location, orientation, and form of a feature. Profile tolerances can be either individual or related.
form tolerance
A geometric tolerance that limits the amount of error in the shape of a feature. The form tolerances include straightness, flatness, circularity, and cylindricity.
orientation tolerance
A geometric tolerance that limits the direction, or orientation, of a feature in relation to other features. Orientation tolerances are related tolerances.
location tolerance
A geometric tolerance that limits the location or placement of features. Location tolerances are related tolerances.
runout tolerance
A geometric tolerance that simultaneously limits the form, location, and orientation of cylindrical parts. Runout tolerances are related tolerances requiring a datum axis.
normalizing
A heat treatment in which the metal is heated to above the upper critical temperature, held for a period, and then cooled in still air. Normalizing produces a uniform rnicrostructure and relieves stress.
ferrous metals
A metal in which iron is the main ingredient. The main groups of ferrous metals are cast iron and steel.
nonferrous metals
A metal that does not contain iron as the main ingredient. Aluminum, copper, and zinc are nonferrous metals.
refractory metals
A metal with an extremely high melting point. Tungsten, tantalum, molybdenum, and columbium are examples of refractory metals.
tangent plane
A modifier specifying that the tolerance zone applies to a plane defined by the high points on a surface. In GD&T, tangent plane is symbolized by a capital T enclosed in a circle.
titanium
A nonferrous metal that is lightweight, corrosion resistant, and has a high strength-to-weight ratio. Titanium is often used in the aerospace industry.
aluminum
A nonferrous metal that is silvery white in color and lightweight. Aluminum resists corrosion and is a good conductor of electrical and thermal energy.
copper
A nonferrous metal that is very ductile, thermally and electrically conductive, and corrosion resistant. Copper is often used to make electrical wiring.
lead
A nonferrous metal that is very soft, ductile, and heavy. Lead is a poor electrical conductor and is often used as a soldering alloy and sound dampener.
tin
A nonferrous metal that is very soft. Tin is often used as a plating metal and soldering alloy.
datum feature
A physical feature that acts as an acceptable substitute for a datum. Datum features relate the various features of the part to each other.
medium-carbon steels
A plain carbon steel that contains between 0.3% and 0.6% carbon. Medium-carbon steels are strong, hard, and not as easily welded as low-carbon steels.
low-carbon steels
A plain carbon steel that contains less than 0.3% carbon. Low-carbon steels are generally tough, ductile, and easily welded.
high-carbon steels
A plain carbon steel that contains more than 0.6% carbon. High-carbon steels are extremely strong and hard.
synthetic polymer
A polymer that is chemically manufactured from separate materials. Some synthetic polymers can be used as quenching mediums.
title blocks
A portion of a print that contains basic identifying information. Title blocks include information such as the company name, part name, part number, and engineer.
orthographic views
A print view that presents a series of illustrations that show a part's top and bottom, front and back, and right and left sides. Orthographic views communicate the shape and size of a part as well as clearly depict all its design elements.
section views
A print view that presents cross-section illustrations of a part that show its interior. A variety of section views may be contained in a print.
auxiliary views
A print view that presents illustrations showing a part at various angles other than a straight-on perspective. Auxiliary views provide a fuller picture of an angled side that cannot be fully represented with a basic orthographic view.
controlled radius
A radius that yields a circle, arc, or sphere with no flat sections or reversals. In GD&T, controlled radius occurs on a blueprint with the symbol CR.
print views
A representation of a part from a specific point of view created from a range of line types that illustrate a part's shape and design. Print views include orthographic, auxiliary, and section views.
3-2-1 Rule
A rule that defines the minimum number of contact points necessary to properly locate a part within the datum reference frame. The primary datum requires three points, the secondary datum two points, and the tertiary datum one point.
Cross section
A section of a feature that is formed by an intersecting theoretical plane. Circularity requires any two-dimensional cross section of a feature to remain within two theoretical coaxial circles.
informational blocks
A section of the print that contains background or general information about the print or part. Informational blocks include title and tolerance blocks.
center point
A single imaginary point located in the center and equally distant from the exterior of a circular feature. When a spherical surface forms a feature of size, it establishes the center point of that sphere.
tool steels
A specialized type of alloy steel that has excellent strength, toughness, and wear resistance. Tool steels are used in cutting tools, punches, and other industrial tooling.
perspectives
A specific point of view. Different perspectives show different sides and aspects of a part on a print.
martensite
A steel that consists of a distorted, body-centered tetragonal crystal structure. Martensite is very hard and brittle.
coordinate tolerancing
A system for describing the design of a part that compares its features to distances along three linear axes. These axes then create an imaginary rectangular grid on which part features are positioned.
cutting-plane lines
A thick line, often dotted or dashed, with arrows at both ends. Cutting-plane lines on a print represent the path and position of an imaginary cut and are used with sectional views of parts.
dimension lines
A thick, solid line with arrows at both ends and a dimension in the center. Dimension lines on a print define the measurement of a part feature.
object lines
A thick, solid line. Object lines, or visible lines, on a print represent edges of a part that can be seen from that particular view.
visible lines
A thick, solid line. Visible lines, or object lines, on a print represent edges of a part that can be seen from that particular view.
hidden lines
A thin line made up of a series of short dashes. Hidden lines on a print define part features that are not visible in that view of the part.
leader lines
A thin line with an arrow pointing at a part feature. Leader lines on a print tie a dimension to a feature, especially when there is limited space on a print
extension lines
A thin, solid line that is perpendicular to a dimension line and placed at the end of a dimension line's arrow. Extension lines on a print connect the ends of a dimension line to the relevant part feature.
cylindricity
A three-dimensional form tolerance that describes the allowable variability in the shape and appearance of a cylinder. Cylindricity is an individual tolerance.
total runout
A three-dimensional geometric tolerance that controls the form, orientation, and location of the entire length of a cylindrical part as it rotates. Total runout is a related tolerance.
perpendicularity
A three-dimensional orientation tolerance that describes the allowable variability in the 90-degree angular relationship between a surface and a datum. Perpendicularity is a related tolerance.
angularity
A three-dimensional orientation tolerance that describes the allowable variability in the angular relationship between a surface and a datum. Angularity is a related tolerance.
parallelism
A three-dimensional orientation tolerance that describes the equal distance between pairs of points, lines, or planes. Parallelism is a related tolerance.
profile of a surface
A three-dimensional profile tolerance that describes the allowable variability in the contour of a surface. Profile of a surface can be either an individual or a related tolerance.
three-dimensional tolerance
A tolerance that controls a shape having a length, width, and depth. Flatness, profile of a surface, and angularity are all examples of three-dimensional tolerances.
two-dimensional tolerance
A tolerance that controls a shape having only a length and width. Straightness, circularity, and circular runout are all examples of two-dimensional tolerances.
individual tolerance
A tolerance that does not require a specified datum. Form tolerances are always individual tolerances, while profile tolerances can sometimes be individual tolerances.
related tolerance
A tolerance that requires a specified datum. Orientation, location, and runout are always related tolerances.
unilateral tolerances
A tolerancing method using a deviation in only one direction, either plus or minus, from the specified dimension. Unilateral tolerances are used if variation in only one direction risks exceeding the given dimension.
bilateral tolerances
A tolerancing method using a plus and minus deviation from the given dimension. Bilateral tolerances are preferred if deviation in either direction risks exceeding the given dimension and can be equal or unequal.
limit dimensions
A tolerancing method using an absolute maximum and minimum allowable dimension. Limit dimensions specify a range of acceptable measurements instead of target dimensions.
Circularity
A two-dimensional form tolerance that describes the allowable variability in the shape and appearance of a circle. Also known as roundness, circularity is an individual tolerance.
circular runout
A two-dimensional geometric tolerance that controls the form, orientation, and location of multiple cross sections of a cylindrical part as it rotates. Circular runout is a related tolerance.
break lines
A wavy or irregular line. Break lines on a print define the boundary of an imaginary, broken-out section of a print or shorten dimensions that are very long.
actual mating envelope
AME. A geometrically perfect shape that is a "best fit" around a feature. The AME is the smallest possible cylinder contacting a shaft at its highest points or the largest possible cylinder contacting a hole at its highest points.
Which of the following is an applicable use for gage blocks
All of the above
The difference in size between two mating parts is considered
Allowance
tolerances
An acceptable deviation from a specified part measurement. Tolerances usually include deviations that are larger or smaller than the intended design.
grains
An arrangement of atoms that creates a uniform, repeating structure. Grains are individual crystals in a metal.
high-performance alloy
An expensive, complex metal alloy designed to perform under intense conditions, such as elevated temperatures. High-performance alloys are also known as superalloys.
superalloy
An expensive, complex metal alloy designed to perform under intense conditions, such as elevated temperatures. Superalloys are also known as high performance alloys.
axis
An imaginary straight line that lies in the center of an object. When a cylindrical surface forms a feature of size in GD&T, it establishes the axis of that cylinder.
median plane
An imaginary, perfectly flat plane positioned in the middle between two opposing flat surfaces. These surfaces form a feature of size in GD&T, establishing the median plane between them.
tolerance block
An informational block that details acceptable deviations from given dimensions for an entire part. Tolerance blocks are used when most part features have a similar tolerance range.
This process returns metals to their original, pre-hardened condition
Annealing
Refer to the micrometer diagram below. What is part #2
Anvil
body-centered cubic
BCC. The crystal structure that contains an atom in the center and one atom in each corner of a cube. Body-centered cubic metals are often hard.
body-centered cubic
BCC. The crystal structure that contains an atom in the center and one atom in each corner of a cube. Steel has a BCC structure at certain temperatures.
Which term below best describes the following: .675.670
Bilateral Tolerance
The ______ and ______ scales both measure the hardness of a material
Brinnel & Rockwell
A negative consequence of hardening metal is that it becomes
Brittle
BUE
Built-up edge. The unwanted, rough edge on a cutting tool created when pieces of the workpiece pressure weld on the tool edge during cutting. BUE can reduce the quality of a finished cut.
A process that uses some type of material containing solid carbon to add carbon to the outer layer of steel is called
Carburizing
When a series of diameters all have the same centerline they are described as being
Concentric
datum reference frame
DRF. Three imaginary planes perpendicular to one another that are mapped onto the part. The datum reference frame provides an anchor for relating part features to each other.
datum reference frame
DRF. Three theoretical planes perpendicular to one another that are mapped onto the part. The datum reference frame provides an anchor for relating part features to each other.
material condition modifiers
Defines the tolerance of a feature in relation to its acceptable size limits. There are three material condition modifiers in GD&T, maximum material condition, least material condition, and regardless of feature size.
face-centered cubic
FCC. The crystal structure that contains one atom in the center of the six sides of a cube and one atom in each corner of the cube. Face-centered cubic metals are often ductile.
face-centered cubic
FCC. The crystal structure that contains one atom in the center of the six sides of a cube and one atom in each corner of the cube. Steel has an FCC structure at certain temperatures.
feature of size
FOS. A cylindrical surface, spherical surface, or two opposed parallel elements or surfaces that can be associated with a size dimension. A feature of size establishes an axis, median plane, or center point.
A X-bar chart tells us if we are making consistent parts
False
All fires can be extinguished with water if a fire extinguisher is not available
False
All micrometers are capable of reading to the nearest 0.0001
False
The R chart below shows we are making consistent parts
False
The lowest concentration of a substance in the air that will burn is called the
Flash point
What is part #1 on the micrometer diagram below
Frame
What items are required in order for a fire to occur? Check all that apply
Fuel Oxygen Heat
geometric dimensioning and tolerancing
GD&T. An international standard for communicating instructions about the design and manufacturing of parts. GD&T uses universal symbols and emphasizes the function of the part.
The best way to calibrate or check the accuracty of a standard 1-2" micrometer would be to use a
Gage Block
You should remove any jewelry before operating a machine because it could
Get caught in the machine
Check all items that are considered PPE
Gloves Safety Glasses Steel Toe Shoes/Boots Respirator
hexagonal close-packed
HCP. The crystal structure that contains a collection of atoms that are closely packed into the shape of a hexagon. Hexagonal close-packed metals are often brittle.
high-strength low-alloy steels
HSLA. A type of steel that contains low levels of carbon and alloying elements. High-strength low-alloy steel exhibits good strength and is relatively inexpensive.
HMIS stands for
Hazardous Materials Identification System
section lines
Identifies the imaginary cut portion of a part in a section view. Section lines appear as a series of diagonal lines drawn close together.
Any liquids spilled on the floor should be wiped up immediately because
It may cause someone to slip and fall
least material condition
LMC. The point at which a feature contains the least amount of material within its acceptable size limit. The largest acceptable hole and the smallest acceptable shaft are examples of LMC.
Refer to the micrometer diagram below. What is part #4
Lock (optional)
maximum material condition
MMC. The point at which a feature contains the greatest amount of material within its acceptable size limit. The smallest acceptable hole and the largest acceptable shaft are examples of MMC.
MSDS stands for
Material Safety Data Sheet
Which tool considered standard shop policy for measurement unless otherwise noted
Micrometer
The first thing you should do when you have an injury is
Notify your supervisor as soon as possible
Created in 1971 as a part of the US Department of Labor, which agency enforces safety standards and guides employers with training to protect the workforce
Occupational Safety and Health Administration
When the distance between two lines is constant and they will never intersect, they are said to be
Parallel
When two lines intersect at a 90 degree angle, they are
Perpendicular
Lubrication specifications and intervals for machine tools and equipment can be found in which of the following
Preventative Maintenance Manual
What semi-precision tool is used to measure and layout angles
Protractor Head
A machinist is cleaning metal chips from a machine with an air hose when a coworker walks past and a particle becomes lodged in his eye. The first action should be
Pull the top eyelid over the bottom eyelid
regardless of feature size
RFS. A modifier indicating that the stated tolerance for a feature applies regardless of its actual size within an acceptable size limit. Regardless of feature size is no longer listed on drawings since it is the assumed default material condition modifier.
Refer to the micrometer diagram below. What is part #7
Ratchet Stop (optional)
A quality inspector randomly selects parts produced from a CNC milling machine during a shift. The parts are inspected according to the procedures detailed in the inspection plan. What is the term given to the parts that were inspected
Sampling
The quantity of parts to be inspected from a production run during a specified time period is stated in the company's
Sampling Plan
Which of the following is not part of a combination set
Screw Pitch Gage
Which semi-precision measuring tool would be best to measure the number of threads per inch on a bolt or screw
Screw Pitch Gage
Coaxial
Sharing a common center between two cylindrical features. Circularity requires any two-dimensional cross section of a feature to remain within two theoretical coaxial circles.
Refer to the micrometer diagram below. What is part #5
Sleeve or Barrel
Refer to the micrometer diagram below. What is part #3
Spindle
alloy steels
Steel that contains added materials that change the property of the metal. Common alloying elements include chromium, manganese, molybdenum, and nickel.
plain carbon steels
Steel that contains less than 3% of elements other than iron and carbon. Plain carbon steel is considered the most "pure" form of steel.
Before leaving a machine that is in operation
Stop the machine
A type of hardening where only an outer layer of material is hardened is called
Surface Hardening
A precise reference plane or surface used in precision measurement is called a
Surface Plate
Which tool from the following list is designed to be used with an outside micrometer to measure hole diameters
Telescope Gage
critical temperatures
Temperatures at which a steel changes phases. The upper critical temperature and lower critical temperature are two significant temperatures.
primary datum
The datum feature that first situates the part within the datum reference frame. The primary datum is the first feature to contact a fixture or surface during assembly.
secondary datum
The datum feature that situates the part within the datum reference frame after the primary datum. The secondary datum is the second feature to contact a fixture or surface during assembly.
tertiary datum
The datum feature that situates the part within the datum reference frame after the secondary datum. This plane must be perpendicular to both the primary and secondary planes and is usually the smallest surface of the workpiece.
cross-section
The interior of a surface that is exposed when the part is cut. Cross-section views in prints provide clearer views of interior features, features with depth, and the workpiece material.
Look at the label below. Check all information that applies based on the information you have available
The material won't burn under normal conditions The material will experience a violent chemical change at elevated temperatures The material can cause serious or permanent sickness or injury The material will react with water
ductility
The measure of a material's ability to be drawn, stretched, or formed without fracturing. Copper and aluminum are highly ductile metals.
ductility
The measure of a material's ability to be drawn, stretched, or formed without fracturing. Copper and lead are two nonferrous metals with high ductility.
hardness
The measure of a material's ability to resist penetration, indentation, and scratching. In some metals, the level of hardness can be controlled through heat treating.
AISI-SAE number
The most common classification in the United States for plain carbon steels and alloy steels. American Iron and Steel Institute (AISI) is an association responsible for setting standards and creating numbering systems for various ferrous metals, and the Society of Automotive Engineers (SAE) writes specifications and other data used in a broad range of industries.
AISI-SAE number with pic
The most common classification in the United States for plain carbon steels and alloy steels. American Iron and Steel Institute (AISI) is an association responsible for setting standards and creating numbering systems for various ferrous metals, and the Society of Automotive Engineers (SAE) writes specifications and other data used in a broad range of industries.
profile
The outline of the part feature within a given plane. Two-dimensional profiles are toleranced using profile of a line, and three-dimensional profiles are toleranced using profile of a surface.
ferrite
The phase at which solid steel has a body-centered cubic crystal structure. Ferrite steel can hold only a minimal amount of carbon, and it is relatively soft.
austenite
The phase at which solid steel recrystallizes and has a face-centered cubic crystal structure. Austenite steel holds a greater amount of dissolved carbon and exhibits increased formability.
scale
The relationship between the drawing of the part on the print and the actual finished part. Scale for an illustration will be given on a print, usually in the title block.
precipitation
The separation of a substance that was previously dissolved in another substance. Carbon appears as a precipitation of cementite in steels with over 0.02 percent carbon.
grid
The setup and structure of a print. Grids use letters and numbers positioned on the outer edges of a print to mark specific part locations.
quenching
The soaking of a metal at a high temperature above the recrystallization phase, followed by rapid cooling. Water, saltwater, air, and oil are common quenching mediums.
quenching
The soaking of a metal at a high temperature above the recystallization phase, followed by a rapid cooling process. The quenching of steel creates martensite
Refer to the micrometer diagram below. What is part #6
Thimble
Which of the following is incorrect when describing an unsafe worker.
Thinks before acting
The amount of permissible variation on part size and shape is known as
Tolerance
SDS is the new name for MSDS. They are both the same thing
True
When you have something important to say to a person operating a machine, you should
Wait for them to stop their machine and acknowledge you.
The following describe safe lifting procedures when moving raw materials (check all that apply)
Wear gloves Asking for help Keeping your back straight Using a forklift or crane Bending at the knees
Which of the following would most likely be used in a long run production situation to quickly check a 0.283" hole diameter with a total tolerance of .003
Which of the following would most likely be used in a long run production situation to quickly check a 0.283" hole diameter with a total tolerance of .003
The process of joining gage blocks together by forcing the air out from between the two surfaces and creating a vacuum enough to hold the gage block build together describes
Wringing
When should safety glasses be worn
all the above
Which of the following is an unsafe practice
all the above
martensitic stainless steel
is stronger than ferritic stainless steel, but it is also more expensive and less corrosion resistant. Martensitic stainless steels should be considered if extra strength is a required property. These metals are primarily used in cutlery and dental and surgical instruments.
ferritic stainless steel
is the least expensive group of stainless steels. They are magnetic and easy to weld, but have poor ductility. Because of their low cost, they should be considered first for most uses requiring corrosion resistance. Ferritic stainless steels are commonly used in kitchen utensils and jet engine components
Austenitic stainless steel
is the most corrosion-resistant type of stainless steel. The surface of this metal can be polished to a mirror finish, which makes the steel visually attractive. However, it is also expensive and should be used only when its unique properties are required. Austenitic stainless steels are used to make food processing and chemical equipment.
Commercial steels contain
less than 2% carbon. Steels are strong, inexpensive, and extremely versatile
1070 plain carbon steel contains ________ carbon than 1020 plain carbon steel
more
Never attempt to inspect a workpiece while it in
motion
A comparison gage and profilometer are used to check
surface finish
The symbol 125√ indicates _______ and is ________ in comparison to a 250√
the surface finish of 125 microinches or better is required; better
