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Millwright Level 3 > Allignment > Flashcards

Allignment Flashcards

1
Q

What is atmospheric pressure?

A

Air has weight and excerpts constant pressure. At sea level it is 14.7psi

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2
Q

PSIA = 14.7
1PSIA = kPA

A

6.9KPA

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3
Q

How do you convert gauge pressure to absolute pressure?

A

Add 14.7 pounds

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4
Q

Which of the following can be compressed or reduced in volume?
Gases
Or
Fluids

A

Gases

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5
Q

What are the three ways to increase the pressure of gas?

A

Reduce volume- so same number of molecules hit a smaller surface area

Pack more gas into confined space

Heat the gas- molecules move faster and hit the surface more often

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6
Q

What are the two scales that measure absolute temperature?

A

Kelvin scale

Rankine scale

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7
Q

0 Kelvin scale is equal to what on Celsius scale?

A

-273 degrees C

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8
Q

1 degree of change on Kelvin scale is equal to …… on Celsius scale?

A

1 degree

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9
Q

Rankine scale in in Celsius or Fahrenheit?

A

Fahrenheit

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10
Q

0 Rankin is equal to ……F?

A

-459.69 F

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11
Q

What is the difference between pascals law and bernoullis principle?

A

Pascals law deals with pressure in a non moving fluid.

Bernoulli’s principle deals with a constant flow of fluid

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12
Q

What does Boyles law state?

A

If the temperature is constant, the volume changes inversely to the pressure.

V1xP1=V2xP2

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13
Q

What does Charles law state?

A

If the pressure on a given volume of gas is held constant, the volume changes in direct proportion to the absolute temperature.

V1/T1=V2/T2

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14
Q

Gay-Lussac’s law states?

A

If the volume is constant the pressure exerted by the gas is directly proportional to the absolute temperature.

P1/T1=P2/T2

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15
Q

The combined gas law states:

A

All three laws exist in a compressor

P1xV1/T1=P2xV2/T2

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16
Q

What are the 3 important factors in pascals law?

A

Force
Area
Pressure

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17
Q

Units of measurement imperial?

A

Area: square inches
Mass: pounds
Force: pounds
Pressure: pounds per square inch

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18
Q

Units of measurement in metric?

A

Area: square meters
Mass: kilo grams
Force: newtons
Pressure: pascals or kilopascals (kPa)

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19
Q

What is force?

A

Anything that changes or tends to change the state of rest or motion.

Force=mass x acceleration

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20
Q

What is area?

A

The amount of surface within a confined boundary.

Area of a circle
A=3.14r2 of a circle
Area of a square
Length x width

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21
Q

What is pressure?

A

The degree or measure of a force that is applied to a specific area.

P=F/A

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22
Q

Boyles law, what is the constant?

A

Temperature

23
Q

Charles law, what is constant?

A

Pressure on a given volume of gas is constant

24
Q

What is the formula for calculating change in length?

A
25
Q

What is the symbol for change?
What is the symbol for length of change?
What is the symbol for coefficient?

A
26
Q

What is the coefficients of linear expansion for carbon steel? Celsius and Fahrenheit?

A

.0000114 C and .00000633 F

27
Q

What is the coefficients of linear expansion of aluminum? Celsius and Fahrenheit

A

.0000223 C and .00001244 F

28
Q

What are the two main misalignment conditions?

A

Angular and offset.

29
Q

What is the acronym for fine alignment

A

Va -vertical angular
Vo - vertical offset
Ha - horizontal angular
Ho - horizontal offset

30
Q

Horizontal alignment is done by shifting the machine in which direction?

A

Sideways

31
Q

What is the advantage of cross dial over rim and face?

A

End float will not change your answer

32
Q

A dial typically goes on the _________ machine?

A

Fixed machine at 12 o’clock

33
Q

Where does the B dial go?

A

MTBS (machine to be shimmed) at 6 o’clock

34
Q

What is the typical distance between the dials?

A

Should be 4 times shaft diameter

35
Q

What are the steps involved in cross dial alignment ?

A
  • pre alignment checks
  • rough alignment
  • bracket and dial indicator attachment
  • bar sag measurement
  • sweep readings
  • horizontal moves
  • vertical moves
  • misalignment calculations
  • repeat last 3 steps until alignment is within spec
36
Q

What are the pre alignment checks?

A

-work permit
- lockout
- hazzard assessment
- foundation
- base
- hardware
- pipe strain
- soft foot
- run out
- end float
- tool condition
- bar sag

37
Q

How much time should the rough alignment take?

A

Spend only the time needed to make the dial plungers make contact with the coupling ring 360 degrees

38
Q

After rough alignment you check for what?

A

Soft foot

39
Q

What is bar sag?

A

The amount the bar will sag in the verticals position in the set up

40
Q

How do you measure bar sag?

A

Remove the setup carefully keeping the same setup. Instal it on the mandrel.

0 both dials rotate 180 degrees and record the readings

41
Q

After bar sag has been measure what is next?

A

Sweep readings.

  • a set of readings is taken from the 12, 3, 6, 9.

Balance dials before adding sag

42
Q

What is the validity rule?

A

Balanced dials

43
Q

What is the Near-near far-far revering to?

A

Rule of thumb when using jack bolts is that the dial nearest the MTBM (b dial) affects the front feet and the dial furthest from the MTMB (A dial) affects the back feet

44
Q

Vertical moves correct _______ misalignment?

A

Angular and offset

45
Q

When adding bar sag which dial do you add it to and which dial do you subtract it from?

A

Add bar sag to A dial and subtract from B dial

46
Q

Horizontal datum for A dial is at which position

A

3 o’clock

47
Q

Horizontal datum for B dial is?

A

9 o’clock

48
Q

Vertical datum for A dial is

A

12 oclock

49
Q

Vertical datum for b dial is

A

6 o’clock

50
Q

If your readings have a are positive you move _______ the datum and if they are negative you move _______ from the datum of

A

Toward datum on the A dial

Away from datum on the A dial

51
Q

Cross dial horizontal math formulas

A
52
Q
A
53
Q

Vertical formula

A

Millwright Level 3 (15 decks)

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