INTMECH Quiz 3 Terms Pt.2

Backlash

The minimum distance is measured between the non-driving side of a tooth and the adjacent side of the mating tooth. It is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth measured on the pitch circle. What is this distance?

Upper Deviation

What is the algebraic difference between the maximum limit and the corresponding basic size?

Fundamental Deviation

This is either the upper or the lower deviation, depending on which is closer to the basic size. How do you call this deviation?

Modulus of Resilience

How do you call the strain energy per unit volume required to stress a material from an unloaded state to the point of yielding?

Beam

How do you call a structural member designed to support loads perpendicular to its longitudinal axis?

Bending Load

It is a load applied transversely to longitudinal axis of member

Distributed Load

What is the load distributed over and entire area?

Fail-safe design approach

It is a design approach where no catastrophic loss can occur as a result of a component failure.

Finite element analysis

It is a computational method used for solving complex shapes, such as those found in machinery; replaces the complex shape with a set of simple elements interconnected at a finite set of a specific purpose.

Thermal-shock failure

When a hot part is cooled suddenly by quenching, there is momentarily a high temperature gradient that induces a stress gradient. Some metal parts under certain conditions crack as a result. How do you call this phenomenon?

Major diameter

How do you call the diameter of the imaginary cylinder that bounds the crest of an external thread and the roots of an internal thread?

Coefficient of thermal expansion

It is a measure of the change in length of a material subjected to a change in temperature

Pitch Circle

How do you call the circle on a gear that corresponds to the contact surface of the friction wheel?

Chrome Vanadium

This material is the most popular alloy spring steel for conditions involving higher stresses than can be used with the high-carbon steels and for use where fatigue resistance and long endurance are needed; this is also good for shock and impact loads.

Guide Bearing

A bearing that primarily guides the motion of a machine member without specific regard to the direction of load application.

18% Chromium and 8% Nickel

Which of the following are the compositions of stainless steel 302

Leaf Springs

These springs are made from one or more flat strips of brass, bronze, steel or other materials loaded as cantilevers or simple beam.

Coil clearance

This refers to the space between adjacent coils when the spring is compressed to its operating length.

Elastohydrodynamic lubrication

This is a lubrication condition where non-conformal surfaces are completely separated by lubricant fil and no asperities are in contact.

Tang

How do you call the flattened end of a shank, and intended to fit into a driving slot in the socket?

Shot blasting

How do you call the process of producing the residual compressive stress of machine parts, which is performed by directing the a high velocity stream of hardened balls or pellets at the surface to be treated.

Peening

It is a process that produces residual compressive stress on the machine part, which uses a series of hammer blows on the surface.

Nitriding

It is a surface-hardening process for alloy steels in which the material is heated to 950F in a nitrogen atmosphere, typically ammonia gas, followed by slow cooling.

Ammonia gas

Which of the following gases is typically used in nitriding process of surface hardening?

Improvement of endurance strength, 50% or more

Which of the following is the benefit in using nitriding as a surface-hardening process for alloy steels?

Material factor for cast steel = 0.70

In estimating the actual endurance strength of steel parts, one of the factors to be considered is the material factor, which of the following is the recommended material factor for cast steel?

Straight line formula

Which of the following column formulas is applicable to cast iron columns?

Wrought Iron

Which of the following ferrous metals has the lowest carbon content?

SAE 1020

If stiffness is the main criterion in selecting a material, which of the following is the most economical choice?

AISI C1112

Which of the following materials can easily be machined?

Orthotropic Material

Wood is an ________ material; that is, its mechanical properties are unique and independent in three mutually perpendicular directions - longitudinal, radial, and tangential.

Limestone

The principle raw materials used in steelmaking are iron ore, coal, and _____

At high cutting speeds

The primary application of high-speed steels is to tools used for the working of metals _____

Contact ratio

In gearing, this is the ratio of teh arc of action to the circular pitch

Three-fourth

Flywheel arms are usually of elliptical cross-section, the strength of the arms should equal _____ the strength of the shaft in torsion

Dynavar

This alloy (nickel, iron, chromium, cobalt is a non-magnetic, corrosion resistant material suitable for sub-zero temperatures and temperatures up to about 750 degrees F., provided that torsional stresses are kept below 75,000 pounds per square inch. It is precipitation-hardened to produce hardness of 48 to 50 Rockwell C and is used in watch and instrument springs.

One-fourth of the shaft diameter

To ensure an adequate factor of safety in the design of a shaft with standard keyway, the key width should be about:

Inertia

What is the property of matter that causes it to resist any change in its motion or state of rest?

Tool life

This is defined as the cutting time to reach a predetermined wear, called the tool wear criterion.

G00

Which of the following G-codes refers to rapid travers in CNC machining?

MDI = manual data input

An acronym in CNC machining which means access of the machine operator to insert machining instructions directly into the NC machine control system via push buttons, pressure pads, knobs, or other arrangements.

Aluminum

The variable polarity plasma arc (VPPA) process was developed for welding metals that form an oxide skin, such as _________

Killed steel

if the steel is strongly deoxidized by the addition of deoxidizing elements, no gas is evolved, and the steel is technically called __________ because it lies quietly int he molds.

10%

Stainless streels generally contain at least _______ per cent of chromium, with or without other elements.

Cold formability

These steels (SAE Steels 1006, 1008, 1010, 1015) are the lowest carbon steels of the plain carbon type, and are selected where __________ is the primary requisite of the user

Austenitic grades

What grades of stainless steels are nonmagnetic in the annealed condition, although some may become slightly magnetic after cold working?

Plus or minus 20%

At certain speeds called the critical speeds, a rotating shaft will become dynamically unstable and the resulting vibrations and deflections can result in damage not only to the shaft but to the machine of which it is a part. At what percentage of the critical speed should a shaft be safely operated?

0.022

In die casting accurate parts made of steel, what shrinkage allowance in inches per inch is recommended?

Hypoid gears

This are gears used to connect shafts that are non-intersecting and non-parallel. they are a cross between spiral bevel gears and worm gears

Dynamic seal

This is a type of seal used where some form of relative motion occurs between rigid parts of an assembly

Oil stream lubrication

It is a lubrication for roller chains wherein the lubricant is supplied by a circulating pump capable of supplying the chain drive with a continuous flow of oil inside the chain loop evenly across the chain width and directly at the slack strand

Blanking

In manufacturing, this is the operation of cutting out flat area to some desired shape and is usually the first step in a series of operation.

M03

An M-code which generally refers to start the spindle rotation in a clockwise direction.

Buffing

A final operation to improve the polish of a metal and to bring out the maximum luster

Titanium

A material of construction (only developed commercially int he late 1940’s concurrently with zirconium) offers the unique combination of wide ranging corrosion resistance, low density, and high strength.

Stress Relieving

This process reduces internal stress, caused by machining, cold working, or welding, by heating the steel to a temperature below the critical range and holding it there long enough to equalize the temperature throughout the piece

Sulfur

A free-cutting steel has a higher ______ content than comparable carbon steels

Hot hardness

This property designates the steels resistance to the softening effect of elevated temperature

Self locking in one direction

In braking, the term backstop refers to a brake that is:

Jib crane

How do you call a fixed crane consisting of a supported vertical member from which extends a horizontal swinging arm carrying a trolley hoist or other hoisting mechanism?

Nodular cast iron

This iron is also known as a ductile cast iron

Conformability

It is the ability to deform plastically to compensate for irregularities in bearing assembly

Third law

Newton’s law of motion that describes that if a force acts to change the state of motion of the body, the body offers a resistance equal and directly opposite to the force

Wrought steels

These are steels most widely used of engineering materials. No other material offers comparable versatility for product design.

SAE 1020

Which of the following steel does not readily respond to heat treatment?

1/16

Rivet holes are made usually _______ inch larger in diameter that the nominal diameter of the rivet

Lame’s Equation

Which of the following equations/formulas does not belong to the group?

G04

In CNC programming, which of the following G code commands is for dwell or rest?

M06

In CNC programming, which of the following M code commands is for a tool change?

Higher than the engineering stress-strain curve

The true stress-strain curve in a stress-stress diagram appears to be:

Case hardening

This is a hardening treatment for steels having low carbon content

Extrusion

What is a manufacturing process used for the production of aluminum?

Fretting corrosion

This refers to a loss of material from the interface of two metal surfaces that are in intimate contact

Shrink fit

This is a type of fit that requires heating the hub to expand its inside diameter

Ball and roller bearings

AFBMA is an acronym for an association involved in what machine elements?

Low carbon steel

What is the general description for mild steel

Octahedral shear-stress theroy

Von mises theory is the other term used for

1.25D to 2.4D

in the design of key, the typical hub lengths are in accordance with the following relation where D is shaft diameter.

Flexible Oldham coupling

A coupling that allows axial flexibility/movement in the operation. Made of the alternate bolting of steel, leather, fabric and/or plastic material into two flanges

Bearing

It is a machine member that supports another part that rotates, slides, or oscillates in or on it.

Sliding Contact Bearing

It is a bearing that permits constrained relative motion of rigid parts; lubricant is generally inserted or supplied between the mating surfaces to reduce friction and wear, and to carry away the heat generated.

Non-conformal surfaces

These are surfaces that do not conform to each other very well as in the rolling-element bearings

Tribology

The study of lubrication, friction and wear of moving or stationary parts is known as:

Rolling element bearing

A bearing where surfaces are non-conformed and motion is primarily rolling; it composed of rolling elements interposed between an outer ring and inner ring:

Addendum angle

In a straight bevel gear, how do you call the angle between an element on the pitch cone and an element on the face cone

Drag-link mechanism

It is a Grashof four-bar mechanism in which the shortest link is the frame or fixed link and the other two cranks completely rotate with their axes. How do you call this Grashof four-bar mechanism?

Grashof’s Law

“For a planar four-bar linkage, the sum of the shortest and longest lengths cannot be greater than the sum of the remaining two link lengths if there is to be a continuous relative rotation between two members.

Drag-link mechanism

It is a Grashof four-bar mechanism in which the shortest link is the frame or fixed link and the other two cranks completely rotate with their axes. How do you call this Grashof four-bar mechanism?

Roughing

This is a shaper operation, which is shaping the given stock and having the excess material remain with a tolerable allowance for finishing

Stellite

This is the trade name for a patented alloy made up chiefly of cobalt, chromium, and tungsten in varying proportions

Machine

This is a combination of mechanisms and other components that transforms, transmits, or uses energy, load, or motion for a specific purpose

Bending Load

How do you call a load that is applied transversely to longitudinal axis of member?

Tresca yield criterion

What is the other term for the Maximum-Shear-Stress Theory, as a failure prediction theory?

Miner’s Rule

This is a theory in cyclic and impact loading, which states that damage at any stress level, is proportional to number of cycles. What is this theory commonly called?

Conrad bearing

How do you call a ball bearing with race containing pronounced groove for rolling elements?

Code

This is a set of specifications for the analysis, design manufacture, and construction of something; the purpose of which is to achieve a specified degree of safety, efficiency, and performance or quality.

Deviation

What is the algebraic difference between a size and the corresponding basic size?

Sine bar

This is used either for every accurate angular measurements or for locating work at a given angle; is used together with precision gage blocks. What is this?

Standard

What is a set of specification for parts, materials, or processes intended to achieve uniformity, efficiency, and a specified quality?

Swing

In a lathe machine, it is the diameter of the largest workpiece it can rotate in a chuck or between centers without hitting the bed