Alignment Flashcards
What does collinear refer to with alignment?
When the centreline of two shafts form a single line
What does MTBS stand for?
Machine to be shimmed
What does MTBM stand for?
Machine to be moved
Why do we not typically align things to 0
Too much time and factors
How many problems relate back to an alignment issue?
70%
What must shims be made out of?
Non corrosive material
What are the two most common materials shims are made out of?
Brass
Stainless steel
When one or more of the mounting feet do not make even contact what is this referred to as?
Soft foot
What are the 3 types of soft foot
Parallel
Angular
Combination
What are the 3 types of misalignment?
Off set
Angular
Combination
What are the 3 types of shims?
Step
Elastomer
Classic
Would a machine with a higher rpm or lower rpm require a closer alignment?
Higher
What is the size of a class A shim
2x2 inches
What is necking a bolt?
Taking its diameter size down to the minimum requires
What does bolt bound mean?
When you’ve run out of room for aligning a machine from the bolt holes
What is the max number of shims you should use?
3-4
What machine is the B dial reading in cross dial?
Moveable machine
What machine is A dial reading
Fixed machine
What does L1 measurement refer to in alignment?
Distance from front door of moveable machine to dial A on fixed machine
Where should the zero be on a dial?
Always at 12:00
When balancing your dial numbers which numbers do you start with?
Putter numbers first
In horizontal alignment if you get a positive number what direction will you move your machine
To the right
In horizontal alignment if you get a negative number what way will you move your machine
To the left
In reference to dual bar sag how do you account for DBS in dial A
Add dial bar sag to vertical number
In reference to dual bar sag how would you account for DBS in reference to dial B
Subtract DBS from vertical of dial B
What is dynamic interruption?
When the laser falls outside of the detector
What can cause dynamic interruption?
Steam
Heat
Dust
(Very bad alignment)
What are the 3 types of laser alignments
Single beam / single reflector
Dual beam / dual detector
Single beam / dual detector
What gives the degree of rotation in laser alignment
Inclinometer
What does an inclinometer do?
Give the degree of rotation
What is the accuracy of most laser alignment?
0.001 - .002
How much rotation does a microprocessor require to do misalignment calculations?
45 degrees
On a single reflected beam laser unit would you mount the laser/detector on the shaft of the fixed or moveable machine?
Stationary (fixed)
What part of the laser preforms misalignment calculations?
Microprocessor (on control unit)
Can you check alignment tolerances with a laser alignment system?
Yes
How are laser alignment systems accuracy checked?
By sending out for calibration
What component mounts on the bracket in laser alignment?
Transmitter and reflector/receiver
Where should the bracket mount to the machines being aligned?
Shafts or coupling depending on the size of the machine
What can give erroneous results from the controller when preforming a laser alignment
Low power in the controller and or emmiter/receiver
Which of the 3 basic laser system types does NOT allow for dynamic interruption?
Dual beam/dual detector
Where are the datum lines used in alignments?
A position selected 0 which you are trying to align too
2) When the plunger of a dial indicator moves out (extends) which way does the pointer (hand) move?
Counter click wise
4) what is the most accurate method of determining thermal growth in machinery?
Using the mathematical calculation
5) the difference between top and bottom readings is know as the
Total indicated reading
6) how are the shaft turned in relation to each other during a cross dial alignment
Pinned together and turned at the same time
7) where are the dials placed while preforming the reverse alignment procedure?
Two dials reading off opposite rims
8) a disadvantage of laser alignment is
The cost
9) to mount a set of reverse dial brackets and dials onto a machine to be aligned mount them so that
Each bracket is mounted onto a separate shaft and supports a dial
10) which dialling alignment procedure has concerns with shaft end float error?
Rim and face alignment
11) what method of alignment is very similar to cross dial method except for the position of the B dial?
Reverse dial method
12) how is dial bar sag taken into account on the A dial
Add DBS at the 6 o’clock position
13) when are mechanics most prone to laser exposure
During laser alignment process
14) how do you confirm the laser detectors accuracy
Return to manufacture for calibration check
15) before starting laser alignment ensure what is completed?
Lock out tag out
16) why misalign a set of machines at the coupling when preforming an alignment?
To allow for thermal growth
17) increases in temperature may cause a machine shaft to
Change its position slightly
18) when shafts are not align with each other in the vertical and horizontal planes when running what is the most common result or symptom?
Vibration levels increase
19) lasers can cause serious eye injury if ___________ happens
Direct viewing
20) what is used on the laser alignment tool to automatically detect the clock position when the unit is rotated?
Inclinometer
21) what is the proper way to store away laser alignment equipment when not in use?
Keep component separated in a padded case
22) which class of laser are on most laser alignment equipment?
II
23) what are three key laser components?
Transmitter
Control unit
Reflector
25) what is a dynamic interruption in the laser alignment process?
The laser beam falls outside the range of the detector
25) when is dial bar sag determined during an alignment
During a pre check before setting up dials
26) what does the “X” represent in the cross dial formula
The distance between the dials
27) once a piece of equipment is align what would be good policy to ensure the machine stays as aligned as possible?
Monitor the torque and maintain the proper torque as needed
28) when is the correct time to conduct an alignment on machinery?
When machinery is at ambient temperature
31) which part of the laser preforms misalignment calculations?
The control unit
32) when using alignment equipment what will happen to your data if the batteries die while in the middle of an alignment
Data will remain for a short period to allow for a battery change out
33) the best set of dial brackets would be
Free of sag by design
35) once a piece of equipment is aligned it is imperative to _____________ so it does not move
Properly torque hold down bolts
36) one advantage of reverse dealing alignment is _________
Limited axial float does not affect the reading since no face readings are taken
44) the most common alignment procedures are _________
Laser
Reverse dial
Tim and face
What the minimum rotation for new laser alignment is _______
45 degrees
Can a laser alignment equipment measure required distances
No
