MACH Reading Section 2 Unit 1-8
Companies rely on ____ information to guide training and protect workers.
MSDS (Material Safety Data Sheet)
____ is the principle that certain mathematical operations must be done in a certain order to correctly perform calculations.
Order of operations
____ can be defined as math using triangles.
Trigonometry
The ____ is the highest concentration of the substance in air that will burn or explode if ignited. TLV
UEL (Upper Explosive Limit)
The ____ was developed to overcome confusion with regard to the differences between metal identification systems.
UNS
Ferrous metals are metals that contain ____.
iron
A ____ employs the use of locks or tags to disable equipment.
lockout
In ____, tags are replaced with padlocks or other lockout devices.
lockout
The ____ is a precision measuring tool that uses a very accurate screw thread to perform measurement.
micrometer
The meter is the basic unit used in the metric system of measurement, but the ____ is most commonly used in the machining industry.
millimeter
A straight edge is a bar with ____ edge(s) that is extremely flat and are available in steel or granite.
one
When angles need to be measured more accurately than within ____ degree(s), the vernier bevel protractor can be used.
one
The side across from any given angle is called the ____ side.
opposite
A(n) ____ projects a magnified image of a part on a screen for measurement.
optical comparator
Pi is shown by the symbol ____.
p 3.14
In ____ squares, because of their solid construction, the 90-degree surfaces between the blade and the beam are much more precise.
solid
The statement that two surfaces are ____ means that they are at 90-degree angles to each other.
square
A ____ plate is a flat plate that is used as an accurate reference surface with other precision tools to aid with some measurement tasks.
surface
Maintenance personnel use ____ devices to prevent powering up equipment.
tagout
The term ____ refers to a line, circle, or arc that touches a circle or an arc at only one point.
tangent
A ____, or allowable variation, gives a size range that is acceptable.
tolerance
The ____ is the lowest concentration of the substance in air that will burn or explode if ignited.
LEL (Lower flammable limit)
____ is the federal agency responsible for conducting research and making recommendations for the prevention of work-related injury and illness.
NIOSH (National Institute for Occupational Safety and Health)
____ metals are metals that contain no iron.
Nonferrous
The ____ is an agency of the federal government that sets and enforces regulations for workplace safety.
OSHA (Occupational Safety and Health Administration)
____ is a measure of the maximum amount of a substance that someone can be exposed to.
PEL (Permissible Exposure limit)
____ stands for parts per billion of a substance.
PPB (Parts Per Billion)
____ refers to safety equipment that is to be worn to protect a person.
PPE (Personal Protective Equipment)
____ gages are cylindrical rods with very accurate diameters that can be used to check hole dimensions.
Pin
The ____ theorem is a formula that relates the lengths of the sides, or legs, of right triangles.
Pythagorean
____ can be defined as the creation of a system of activities used to make sure that happens.
Quality assurance
____ is the name given to the actions of inspecting dimensions to make sure tolerances are met.
Quality control
The ____ shows the amount of variation of each sampling.
R-chart
____ gages are used to check outside corner and insider corner radii.
Radius
____ gages are used to inspect external diameters similar to the way pin or plug gages are used to check internal diameters.
Ring
In global manufacturing and in the machining industry, the metric system is sometimes referred to as the International System of Units or ____.
SI
A(n) ____ is a concentration of exposure that is permissible for 15 minutes at a time.
STEL (Short Term exposure Limit)
____ is a ratio between the lengths of the opposite side (O) and the hypotenuse (H).
Sine
____ tools have two equal-sized cylinders, called rolls, mounted near each end.
Sine
____ gages feature a split ball end that expands when an adjusting screw is tightened.
Small hole
____ can be used to check for perpendicularity. Gages
Squares
___ is a sophisticated method for tracking variation in sizes of machined parts
Statistical process control
A telescoping gage is shaped like a(n) ____ and has two arms that expand when the locking screw is loosened. D
T
A(n) ____ states an amount that should not be exceeded within an 8-hour time frame.
TWA (Time Weighted Average)
____ tools are used when the measurement must be transferred to and measured with a rule.
Transfer
____ inspections might include checking first aid supplies and ensuring that all hazardous materials are labeled appropriately.
Weekly
The ____ chart graphs the mean size of each sampling.
X-bar
Snap gages are ____-shaped gages that can be used to check external dimensions.
c
The ____ set consists of a blade, square head, center head, and protractor head.
combination
A ____ plan can be defined simply as a strategy of steps needed to perform a machining operation or operations.
process
A more accurate measurement of Ra surface roughness can be obtained with a ____.
profilometer
A plain ____ is used to measure angles and has two sets of one-degree graduations to allow measurement from either side of the protractor.
protractor
The ____ is calculated by subtracting the smallest dimension from the largest dimension in the sampling.
range
The ____ is by far the most common semi-precision measuring tool utilized in the machining field.
rule
The ____ plan states how many parts should be inspected from a given batch or during a given time period.
sampling
A(n) ____ gage determines the distance between threads.
screw pitch
A ratio is a comparison between ____ numbers.
two
Adjustable parallels are ____-piece blocks with parallel surfaces that can be locked in position by a clamping screw.
two
Adjustable squares are made in ____ piece(s) and can easily be adjusted and disassembled.
two
Toolmaker's microscopes feature movement in ____ directions through the use of micrometer dials to obtain measurements.
two or three
A ____ measuring tool contains a main scale and a secondary sliding scale called the vernier scale.
vernier
Precision fixed gages are usually used to no more than ____" accuracy.
0.0005
A vernier caliper can be used for measurements as small as ____.
0.02 mm
Depth micrometer interchangeable rods are produced in ____" or 25-mm increments.
1
Precision measurement refers to measurement beyond 1/64 or 1/100 of an inch, 0.5 (1/2) millimeter, and ____ degree(s).
1
A complementary angle is the result of a given angle subtracted from ____ degrees.
90
Part surfaces are compared to the ____-degree corner of the square.
90
Perpendicular lines or surfaces are those that intersect at a ____-degree angle.
90
The term ____ refers to lines or surfaces that, in theory, will never intersect, or touch, if extended.
parallel
Class ____ fires are what OSHA defines as those involving ordinary combustibles, such as paper, cloth, wood, rubber, and many plastics.
A
____ health effects are short-term.
Acute
____ gages can compare part angles to standard angles similar to the way radius and fillet gages are used.
Angle
In right-angle trigonometry, angle ____ is always 90 degrees and side ____ is called the hypotenuse.
C
____ of a micrometer, or checking a tool with a more accurate tool, should be performed periodically to check for proper function.
Calibration
____used in semi-precision measurement have two legs that make contact with part surfaces to obtain measurements.
Calipers
In machining, parts and their features are often located using two- or three-dimensional ____ coordinate systems.
Cartesian
____ is a ratio between the lengths of the adjacent side (A) and the hypotenuse (H).
Cosine
The ____ is a federal agency whose purpose is to protect human health and the environment.
EPA (Environmental Protection Agency)
The standard system of measurement in the United States is the ____ system.
English
___ gages are strips of metal available in different thicknesses that can be used to check small clearances and spaces.
Feeler
____ gages are tools without adjustment that are used for comparative measurement of parts to a particular size.
Fixed
___ blocks are extremely accurately sized blocks with very smooth surfaces that can be used for part inspection or to check the accuracy of other precision measuring tools.
Gage
___ is math involving shapes and their relationships.
Geometry
____ are the divisions or spaces on a rule.
Graduations
____ offers highly visual systems that serve as warnings of potential dangers.
HMIS (Hazardous Material Identification System)
SPC plots data on ____ charts to analyze trends in part variation.
control
A ____ identifies locations in an X, Y, Z coordinate system.
coordinate measuring machine
A ____ is a tool that shows small movements by displaying them with a needle on a graduated dial face.
dial indicator
The ____ of a circle is the distance from one side to another through the center.
diameter
A ____ is a hybrid between a square and a protractor.
die maker's square
On ____ indicators, the movements are displayed on a digital readout.
digital
During machining, ____, or specified print sizes, must be measured to be sure they are within required specifications.
dimensions
Two pin gages can be used to create what is called a ____-end go/no-go plug gage.
double
A proportion is two ratios that are equal to ____.
each other
The ____ refinement of iron ore produces wrought iron.
first
The ____ point, or lowest temperature where the substance can be ignited, is listed in this section.
flash
A vernier ____ gage is like a caliper mounted on a solid base for use on a surface plate.
height
Both control charts of an SPC must be within their UCL and LCL for the process to be ____.
in control
That system of measurement is based on the ____.
inch
A(n) ____ plan tells what dimensions to inspect and what measuring tools and processes to use during inspection.
inspection
