Alignment

Question 1

This alignment method uses two dial indicators mounted 180 degrees across from each other

Answer 1

Cross dial method (shafts must rotate together)

Question 2

Before using the cross dial method what type of alignment should you use

Answer 2

Rough alignment to ensure the dial plunger makes contact with coupling rim a full 360 degrees

Question 3

Whats an advantage of cross dialing over rim and face

Answer 3

End float does not effect it due to no face readings

Question 4

In cross dial alignment what should the distance be between dials

Answer 4

4 times the shaft diameter (minimum)

Question 5

Where are the A and B dials set up using the cross dial method

Answer 5

‘A’ Dial is on the fixed coupling at 12 o’clock

‘B’ Dial is on the MTBS coupling at 6 o’clock

Question 6

How should the dials be mounted in cross dialing

Answer 6

180 degrees and perpendicular to the surface they are measuring from

Question 7

What is the validity rule?

Answer 7

The sum of 3 and 9 o’clock must add up to the sum of 6 and 12 o’clock before bar sag is accounted for

Question 8

What is the rule of thumb when using jacking bolts

Answer 8

The dial nearest to the MTMB affects the front feet, and the dial furthest from the MTBM affects the back feet. (Near-Near, Far Far)

Question 9

How is bar sag calculated

Answer 9

Add sag to Dial A, Subtract sag to Dial B

Question 10

Positive readings are _____ the datum, negative readings are ____

Answer 10

Towards, away

Question 11

How much is 1 mil

Answer 11

0.001 inch

Question 12

What should you do before making corrective shims on the MTBS

Answer 12

Place the dials and brackets at the 3 and 9 position and set to zero as well as make sure the jacking bolts are just touching the side of the MTBS

Question 13

The dials always indicate ___ times the misalignment at the dial plane

Answer 13

two times

Question 14

What is the maximum amounts of acceptable error after the alignment is finished called

Answer 14

Misalignment limits

Question 15

What are the maximum offset parallel and maximum angular misalignment?

Answer 15

Maximum offset parallel misalignment: +-0.002” @1800rpm

Maximum angular misalignment: +-0.0002” @1800rpm

Question 16

In this type of cross dialing both dial indicators are in the 12 o’clock position

Answer 16

Reverse reading alignment

Question 17

The accuracy decreased when the distance between dial indicators is less than this

Answer 17

4”

Question 18

How should shim changes be made

Answer 18

Loosen hold down bolts one leg at a time

Question 19

Which is the fixed unit?

Answer 19

The driven unit

Question 20

What does Laser stand for

Answer 20

Light Amplification by Stimulated Emission of Radiation

Question 21

What are the three basic types of laser alignment

Answer 21

Single reflected beam with a single detector
Dual beam with dual detectors
Single beam with dual detectors

Question 22

What is dynamic interruption

Answer 22

Occurs when the beam falls outside the range of the detector while rotating the coupling. It allows you to readjust the beam back without starting over

Question 23

Which types of laser alignment does not allow for dynamic interruption

Answer 23

Dual beam dual detector

Question 24

What are the key laser components

Answer 24

Transmitter or detector unit
Reflector
Bracket

Question 25

What do you use to to maintain accurate and consistent repositioning of the shafts at the clock locations with laser alignment

Answer 25

An inclinometer

Question 26

Newer laser systems have an operating range of up to

Answer 26

10m (33ft)

Question 27

What can cause inaccurate readings for laser units

Answer 27

Strong heat or steam sources

Question 28

On most laser systems the units require the _____ to the on the stationary machine and the _______ to be on the MTBM

Answer 28

Laser, reflector

Question 29

In laser alignment what do you use to maintain accurate and consistent repositioning of the shafts at the locations

Answer 29

An inclinometer