Alignment Flashcards
What are the two types of misalignment offset and ________?
Angular
What is the most common form of misalignment?
Angular
Offset
Combination
Combination
What are the two types of vertical misalignment? Angular and _______.
Offset
When dealing with vertical misalignment to resolve the issue typically you add or remove _______?
Shims
To correct horizontal misalignment you typically move the __________unit using jack bolts.
Driver
In most situations what is the primary unit? Conveyor or transmission unit
Conveyor
Why is the primary unit usually the stationary unit?
Because it is usually installed first to coincide with the layout of the configuration
Combination misalignments are corrected by making both vertical and horizontal adjustments.
True or false
True
What is soft foot?
When all the supporting members of the machine do not equally support the weight of the machine.
Two types of soft foot are ordinary and _________?
Angular
ordinary soft-foot has a uniform gap between one foot of a machine and the baseplate. Angular soft-foot has an _______ or ________ gap between a machine foot and the base plate
Angular
Or
Uneven
Information about thermal size change is usually supplied by who?
The equipment manufacturer
What is more accurate: setting up machines at running temperatures or calculating thermal changes and deliberately misaligning the equipment at the ambient temperatures?
Calculating thermal changes and deliberately misaligning the equipment and the ambient temperature
A poor shaft coupling alignment results in:
increased loads and bearings
Flexing of shafts
And _______________
Vibration
The four types of alignment are:
Rough alignment using straightedge and feeler gauges
Rim and face dialling
Cross dialling
And ___________?
Laser
Why are pre-cut stainless steel shims preferred?
Faster to use
Produce fewer inaccuracies
Class: A B C D Are which sizes?
A=2x2
B=3x3
C=4x4
D=5x5
How many shims should be used?
3-4
Ultimately the least number as possible
What order do you place the shims?
Largest on the bottom
Second largest on the ________
Smallest ones in the ________
Top
Middle
If alignment screws are used to push the equipment side to side on the horizontal plane. What are jack screws and jack bolts are used for?
Lift and lower machine unit
Before tightening the hold down bolts you must ensure the _________ are loosened
Jack screws
It is always better to use a tool under a piece of elevated machinery VS your hand
True or false
True
What does TIR mean
Total indicator reading
To set the TIR in the vertical plane you zero the dial at the ________ position
12 o’clock
To set the TIR in the horizontal plan you set the rail to zero at the __________ mark?
3 o clock
TIR F indicate what ______?
Face
TIR R indicate ________?
Rim
Always rotate shafts in __________wise direction is preferred?
Clockwise.
A quick check of soft foot on a machine would be to:
Remove all olds shims and clean base and feet
Reinstall driver with torque bolts loose
Try rocking drive across diagonal
Check each foot my trying to slide feeler gauge under each foot.
Any foot that a .003 feeler gauge can pass through is a soft foot
If a thicker gauge only fits part way and angular soft foot is indicated
When using dial indicators to check soft foot what is the major difference in procedure?
When using dial indicators you tighten the hold down bolts instead of loosening them after shims are removed
Two ways of correcting angular soft foot are: using hand cut graduates shims or __________?
Using elastomer shims
When checking for soft foot, dial readings are not equal to the amount of movement at the foot. The rule of thumb is to use 80% of the value shown on the indicator.
True or false
True
On larger machines it may be possible to check for soft foot with a dial by placing dial directly on each foot. If there is a dial reading when the bolt is loosened, it means there is soft foot.
True or false
True
What are types of run out? Concentric(no runout), Eccentric shaft, eccentric run-out and __________ runout?
Angular
Why must end float be controlled before an alignment?
It will produce an unreliable alignment
When measuring dial bar sag you must transfer entire dial and clamp set up onto the test mandrel exactly how it was originally set up on the work piece. Going from 12 o’clock to 6 o’clock you must record readings. If the reading was -.004” add the bar sag value to the 6 o’clock RIM readings only.
True or false
True
You would use a straightedge and feeler gauge to initially check parallel offset.
True or false
True, do this for both horizontal and vertical planes
Feeler gauges or ___________ can be used to roughly check angular offset
Callipers
When dials are used in the top position, it is referred to as 12 o’clock. The horizontal position on the right hand side is referred to as the _____ o’clock position.
3
Why is it important to make sure the plunger on a dial indicator is 50% depressed?
This allows for .050” in either a positive or negative direction
Balanced refers to the sums of the horizontal and __________ as being equal. If the dials are not equal( or within less than the 10%) there is a problem within the setup
Vertical
Vertical alignment formula?
Rough alignment should be within about ______thousands of an inch?
.010
Why is it important to mic the shims?
Because they may not be the exact size stamped onto the shim
Different ways to check angular offset. See pic
Which machine do the dials read off of when doing a rim and face alignment?
Clamp is set up on the machine to be shimmed MTBM and the dials read of the fixed machine
Once setup is complete and dials have been zeroed and rotate the dial 360 degrees. Checking and recording the dial readings in all 4 spots, 12, 3, 6 , 9. Now what?
Validate the setup by checking that the sums of the 9 and 3 equal the sums of the 12 and 6 o’clock. (Top+Bottom=Left+right)
If the sums of the readings do not add up that means they are not balanced. What does that mean?
There is a problem in your setup
- loose clamping
- sticky dial
- coupling binding
- etc
Positive number are_______ datum and negative numbers are _______ datum
Toward
Away
Determine 6 and 9 o’clock positions by viewing from the ?
Fixed machine
When reading off dials mounted on the backside of the coupling make sure to?
Reverse face dial signs (+ -)
S1= formula
L1/D x TIRface - TIRrim/2
L1 = front foot of MTBM to rim dial
D = diameter made by face dial
S2 = formula?
L2/D x TIRface - TIRrim/2
L2 = bolt centre of back foot on the MTBM
D = diameter of face dial
