Module 2 - Machine Design Elements

pitch plane

in a pair of gears _ is the plane perpendicular to the axial plane and tangent to the pitch surface

creep

the phenomenon of continuous stretching under load even if the stress

planing

machinery operation whereby done with work accurately fastened has a reciprocating forward and backward motion and the total head is stationary

composition

finding the resultant of two or more forces is called

strength

the capacity of metal to withstand load without breaking

pride and enthusiasm to oneself

outstanding safety record contributes to

elastic material bushed coupling

a type of coupling that allows slight amount of torsional and angular flexibility due to introduction with some elastic material cylindrically wrapped around the bolts in the flange

at either end support

in a uniformly loaded beam, the maximum vertical shearing force occurs

cold working

copper and most of its alloys can be hardened by:

drill will become overheated and will drawn from the steel

what happens to a drill if the operating speed is to fast

bh2/6

the section modulus of a rectangle of base b and height h about it base is

sap wood

a material that should be avoided in constructing wood pattern

corrosion

the gradual chemical reaction by other substance such as metal is converted to an oxide or other compounds

tool and die steel

which of the following is not structural steel class

¼ of H

the center of gravity of solid pyramid or cone with a total height of H is

forging machine

which do not belong to foundry of metal casting shop?

tensile strength

what is the property of a material which resists force acting to pull the material apart

module

the reciprocal of diameter pitch equivalent to the ratio of the pitch diameter to the number of teeth

brass is composed of copper and zinc while bronze is composed of copper and tin

which is the difference between brass and bronze?

momentum

the first derivative with respect to velocity of kinetic energy is

tip relief

the arbitrary modification by removing a small portion of a tooth material at the tip of the gear tooth is called

type B belts

types of v belt to use in a driving pulley with a speed of 360rpm and transmitting 5hp.

bevel gear

what type of gear that can transmit power at an angle

mercury

a liquid metal

the initial velocity

an object is thrown upward and will return to earth with a magnitude of the terminal velocity equal to

seal

used in conjunction with circular cross sectional members to retain oil and prevent dirt, foreign particles, moisture and to permit pressure differential between exterior and interior of the applied part

herringbone gear

commonly use in parallel shaft transmission especially when smooth, continuous section is essential as in high speed drives up to 12,000 fpm

340 - 360 normally

the hardness of helical and herringbone gear teeth after heat treatment is 210 to 300 brinell hardness for gear and pinon is at

line of action

the path contact in involute gears where the force and power is actually transmitted. It is a straight imaginary line passing through the pitch point and tangent to the base circle

the tool of the sharper moves while on the planer is stationary

what is the difference between a shaper moves while on the planer is stationary

torsional strength

what is the metal characteristic to withstand forces that cause twisting?

sulphur

in the greater quantity this element is harmful to the ferrous metal:

packings

to prevent leakage in dynamic seal

SAE 6XXX

it has molybdenum alloy except

internal gear

a type of tooth gear cut inside a cylinder or ring

packing

flexible material used to seal pressurized fluids, normally under dynamic condition

chrome nickel steek castings

cast alloy steel for very high temperature application

annealing

what heat treatment process can cast steel materials of high chrome, high manganese, etc. type of steel be subjected for the purpose of machining process

zinc

galvanized steel plate is a plate coated with

copper

major component of bronze casting

55 to 60%

split pulley made of separate sections bolted together at the rim, the maximum speed should be limited about _ % of the maximum speed of solid pulley

reduce concentration of stress and extend the life of parts

fillet radius in machine parts is usually introduced to:

stud bolts

type of bolt commonly used in the construction that is threaded in the both ends

annealing

heating of the metal to a temperature above critical temperature and then cooling slowly usually in the furnace to reduce the hardness and improve machinability is called

the lube oil is supplied under pressure

a hydrostatic bearing is one which

low carbon steel

one of the following materials is unsuitable as bearing

safety notices in markings

safety features that must be placed and maintained at machine, blacksmith welding and foundry shop

base helix angle

the angle at the base cylinder of an involute gear, that the tooth makes with the gear axis

UNC

a kind of thread that is usually used

IPS

which is not generally used in standard

chromium molybdenum steel

alloy steel known for its resistance to corrosion, abrasion and wear that is usually ideal for mill grinding of ore in cement and concentrator application. It usually combined with molybdenum to increased the depth hardening

SAE 1030

commonly utilized cheapest shaft material available in the market with carbon content of 0.28 to 0.34%C.

axial plane

in the pair of gears it is the plane that contains the two axis, in single gear, it may be any plane containing the axis an the given point

the foreman’s responsibility just as much as production

accident prevention is

annealing

heating of metal above the critical temperature and then cooling slowly usually in the furnace to reduce the hardness and improve the machinability is called

metal spray welding

a type of welding whereby a wire or powder form the nozzle of a spray gun is fused by a gas flame, arc or plasma jet and the molten particles are projected in a form of a spray by means of compressed air and gas

silicon

killed steel is very much associated with

fillet curve

the concave portion of the tooth profile where it joins the bottom of the tooth space

circular thickness

the length of arc between the two sides of the gear tooth on the pitch circle

quenching

it is the hardening treatment whereby a cast metal is being heated to a very high temperature then suddenly subjected to a rapid cooling to improve hardenability or wear resistance is called

bronze rim with cast steel spider

to reduce the cost in the manufacturing of large worm gears the materials utilize

load of beam

the differential of the shear equation is which one of the folowing

SAE 1117

SAE steel that responds to heat treatment

dedendum circle

a circle bounding the bottoms of the teeth

strain

a unit of deformation is called

self supporting umbrella roof

an oil storage roof formed to approximately a spherical surface, supported only at its periphery

bend

test sometime referred to as an upsetting test

self supporting cone roof

an oil storage roof formed to a approximately the surface of a right cone, supported only at its periphery

thrust bearing

have the same thermal and minimum film thickness limitation as sleeve bearing

lap weld

test is designed primarily for application for electric welded tubing for detection of lack of penetration or overlaps from flash removal in the weld

apitting

is a form of correction that develop on a highly localized areas on the metal

chalking

the deterioration of organic coating characterized as completely

crown gear

a gear is one which is 90 degrees that is pitch cone has become a plane

rockwell superficial

a machine used for testing of very thin steel or surface layers

back cone

a cone formed by elements which are perpendicular to the elements of the pitch cone at the large end

melting point

the temperature above which the alloy is liquid and will run

tack weld

a weld made to hold the parts of the weldment in proper alignment until the final welds are made

helical driving mechanism

is used to enable milling machine to take climb milling cuts

elongation

total amount of permanent extension of the gage length measured after the specimen has fractured and is expressed as percentage increased of the original gage length

fouling

refers to any layer or deposit of extraneous material on a heat transfer surface

stainless steel

steels containing large amount of mild nickel and chromium

rusting

the corrosion of iron or iron base alloys

modulus of elasticity

the ratio of stress to the corresponding strain below the proportional limit

full fillet weld

a fillet weld whose size is equal to the thickness of the thinner joint member

miter gears

a bevel gear of the same size mounted on a shaft at 90 deg.

friction gear

gearing in which the motion or power that is transmitted depends upon the friction between the surface in the contact

spur friction wheels

wheels are sometimes used for the transmission of high power when an approximately constant velocity ratio is desired

galvanic

a corrosion occurs within the or adjacent to a crevice formed by the contact with another piece of the same or another metal

fillet weld

a weld of approximately triangular cross section that join two surface at approximately right angles as in lap joint, tee joint, corner joint

babbit

an alloy of tin, copper, antimony or sometimes lead

butt weld

a weld place in a groove between two abutting members

bend

a test for pipe used for coiling in sizes 2 inches

cylindrical cam

the follower reciprocates or oscillates in a parallel plane to the axis of rotation

ultimate strength

strength of a material that is of a stress intensity determined by considering the maximum test load to act over the original area of the test specimens

radial cam

the follower reciprocates or oscillate in a plane perpendicular to the axis of the rotation of the cam

slotting attachment

impacts of reciprocating motion to a single point cutting tool

a single welded lap joint

a joint between two overlapping members in which the overlapped edge of one member is welded with the fillet weld

¼ inch

weld metal impact specimen shall be taken across the weld face substantially parallel to and within

tensile strength

the maximum stress which is reached during a tension test

cycloidal gears

if gears cannot connect parallel shafts, they are called