2nd Test for Industrial Mechanics

The shim stock thickness required to correct the angular misalignment in the vertical plane of a pump and motor assembly having a 3" D coupling, a vertical angular gap of 0.033", and an MTBS mounting hole distance of 4" is _________"?

0.044

The proper belt deflection of an assembly using a 6" pulley and a three inch pulley having a length of 12" is________

0.187

The shim stock thickness required to correct the angular misalignment in the horizontal plane of a pump and motor assembly having a 3" D coupling, a horizontal angular gap of 0.087", and an MTBS mounting hole distance of 4" is _________"?

0.261

The proper belt deflection of an assembly using a 36" pulley and a 12" pulley having a length of 24" is________

0.371

The proper belt deflection of an assembly using a 15" pulley and a 6" pulley having a length of 42" is________

0.655

the tooth form of a rack gear consist of how many flat surfaces?

1

A base plate that is drilled and tapped to anchor a machine must be a minimum thickness of ______ times the root diameter of the anchoring bolts

1.5

Offset misalignment must be within _______ per foot of drive center distance

1/10"

the accuracy of straightedge alignment is generally n o better than _____

1/64

The top position, when using a dial indicator, is know as the ____ position

12:00

when using the combination rim-and-face alignment method, angular misalignment in the vertical plane is checked by measuring the face of the coupling at the ______________ positions

12:00 and 6:00

Dowel effect is corrected by using machined washers ______times thicker than the original washer?

2 to 3

when using the combination rim-and-face alignment method, angular misalignment in the horizontal plane is checked by measuring the face of the coupling at the ______________ positions

3:00 and 9:00

The recommended torque value for a size W hub is ____ ft/lbs

400

The recommended torque value for a size SHhub is ____ ft/lbs

6

horsepower is equal to

746 watts

helical gear drive angle may be anywhere from 0 to

90

the two methods of measuring soft foot are the__-____-____method and the_____ ________ method.

At-each-foot, shaft deflection

_________ is the condition that exists when the bolt hole of a machine is so large that the bolt head forces the washer into the hole opening on an angle

Dowel effect

______ are quieter and smoother running that spur gears

Helical gears

Always choose the combination that uses the ________ amount of shims or spacers when different shim or spacers can be chosen.

Least.

A trapezoidal timing belt with a mini extra light cross section is classified as

MXL

What are jack screws used for?

Machine movement only.

What is runout?

Radial variation from a true circle.

When aligning machinery, MTBS is an abbreviation for machine to be______?

Shimmed

A ________ is a steel material used for filling spaces over 1/4.

Spacer

When aligning machinery, SM is an abbreviation for machine to be______?

Stationary

Feeler gauges can determine the air gap between two solids to accuracy within _____ of an inch.

Thousands

A trapezoidal timing belt with a double extra heavy cross section is classified as

XXH

Precut stainless steel shims are recommended for ___________ purposes.

alignment

_______ is the location (Within tolerance) of one axis of a coupled machine shaft relative to that of another

alignment

__________ is any means of fastening a mechanism securely to a base or a foundation

anchoring

___________ soft foot exists when one machine foot is bent and not and the same plane as the other feet

angular

____________________ is a condition where one shaft is at an angle to the other shafts

angular misalignment

Pulleys should be placed ____________ to te shaft bearing to prevent overhung loads

as close as possible

__________ is the axial movement of a shaft due to bearing and bearing housing clearances

axial float

________ is the play between mating gear teeth.

backlash

A __________ is a rigid steel support for firmly coupling and aligning two or more rotating devices

base plate

A _______groove gauge is a gauge that has a male form to determine the size of a pulley and a female form to determine the size of the belt

belt and sheave

too little tension on the belt causes

belt slippage

a ___gear is a gear that connects shafts at an angle in the same place

bevel

________ is the process of placing a solid object in the path of a power source to prevent accidental energy flow

blockout

for optimum efficiency, a V-belt should not touch the

bottom of the pulley

_____ is the process of pressing the start switch of a machine to determine if the machine starts when it is not supposed to start.

challenging

_____ is the radial distance between the top of a tooth and the bottom of the mating tooth space when fully mated

clearance

what symbol is used to indicate a relation between terms?

colon

V-belts should not remain _____ as the belt bends around the pulley

constant

__________is the process or action of eating away gradually by chemical action

corrosion

A _________ is a device that connects the ends of rotating shafts.

coupling

Doubling the load on a bearing ____ it's service life by 6 yo 8 times

decreases

a __________ is a device that measures the deviation from a true circular path

dial indicator

________________ is the raqtio of the number of teeth in a gear to the diameter of the gear's pitch circle

diametrial

to find foot-pound of torque when inch-pounds of torque are known, you

divide by 12

when reading the dial indicator, the reading does/doesn't have to be a zero?

doesn't

A ___________ V-belt is a belt designed to transit power from the top and bottom of the belt

double

a _____ is any gear that turns or drives another gear.

drive

the ________ is thte length of the teeth in an axial plane

face width

a _____________is the breaking or tearing of gear teeth

fatigue fracture

a ______________ is a machine-bored one piece pulley

fixed bore pulley

tooth _____ is the shape or geometric form of a tooth in a gear when seen as it's side profile

form

a ____ is a toothed machine element used to transmit motion between rotating shafts

gear

prelubricated bearings may not be__________

heated for installation

an _______ is a gear that transfers motion and direction in a gear train, but doesn't change speeds.

idler gear

as the temperature of steel __, it discolors, turning from silver to lack

increases

proportions are either direct proportion or ____________

inverse

A ____________ is a tooth form that is curled or curved

involute

______is a screw inserted through a block that is attached to a machine base plate, allowing for ease in machine movement.

jack screw

good shim packs are _______ with each size printed on them

laser cut

The _______________________________ alignment method is used when extreme accuracy and fast alignment is require

laser rim-and-face

A better finish on a bearing produces ____________ friction

less

Rack teeth are gears used to produce ____________

linear motion

a _____ drive is a system in which power is transmitted from one point to another

mechanical

______ is the condition where the centerlines of two machine shafts are not aligned within tolerances.

misalignment

__________ bearings are generally press fit

needle

Bearings should ____ be struck with a hammer

never

A _______ value is a designated or theoretical value that may vary from the actual value

nominal

__________________ is a condition where 2 shafts are parallel but the pulleys are not on the same plane

offset misalignment

___________________ is a condition where two shafts are parallel, but are not on the same axis.

offset misalignment

an _________ is a force exerted radially on a shaft that may cause bending of the shaft or early bearing and belt failure.

overhang

Solid or caked lubricants are signs that the bearing is ______

overheated

_______ soft foot exists when one or two machine feet are higher than the others and parallel to the base plate

parallel

A ________ gear id the smallest pair of gears

pinion

Belt________length is the total length of the timing belt measured at the belt pitch line.

pitch

_____ bearings may support radial or axial loads

plain

ball bearings are installed with one ring being a ________ and the other being a ____________________

press fit, push fit

the ________ is the relationship between two quantities of a term

ratio

bearing _______ is more difficult the bearing ______

removal, installation

The ______ method is the most widely used, most widely misused, and the most troublesome of the precision alignment methods

rim-and-face

The objective of proper alignment is to align the ______, not the __________.

shafts, couplings

_______ is a condition that occurs when one or more feet of a machine do not make contact with the base.

soft foot

____________________ is a condition that occurs when a dial indicator at the shaft shows soft foot, but feller gauges show no gaps.

springing soft foot

a _______ gear is a gear that has straight teeth that are parallel to the shaft axis.

spur

a _______ gauge is a flat,tapered strip of metal with graduations ini thousandths of an in or millimeters marked along it's length

taper

The ___________ is the load carrying element of a belt, that prevents stretching

tension member

__________ is the dimensional change in a substance due to a change in temperature.

thermal expansion

a _________ belt is a belt designed for positive transmission and synchronization between the drive shaft and the driven shaft

timing

______ is the twisting force of a shaft

torque

true or false. Do gear manufacturer's design certain parts of a gear to wear out or break before others

true

A ______________ belt drive is a mechanism that transmit motion from one shaft to another and allows the speed of the shafts to be varied

variable

______ is the depth of engagement of two gears

working depth