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