Alignment

Question 1

Is vibration analysis good way to check for alignment tolerances
True or false

Answer 1

True

Question 2

Class a shim is what

Answer 2

2 by 2

Question 3

Class B is what

Answer 3

3 by 3

Question 4

Class c is classified as what

Answer 4

4 by 4

Question 5

Class d is classified as what

Answer 5

5 by 5

Question 6

Dial indicator procedures

Answer 6

• Make sure the dial indicators contact shafts are positioned square to the surface. This ensures an accurate reading.
• Always sel the dial indicator bezel at the zero (or to the pre-determined sag) position prior to rotating and taking any readings.
• Accurately position the dial indientor at the 12 o’clock position and carefully rotate and accurately position the dial indicator at the
3 o’clock, 6 o’clock, 9 o’clock positions to take the readings. You mas use special attachments such as rotating levels that attach to the indicalor bracket for this purpose. Accurately positioning the dial indicalor reduces confusing readings to improve accuracy.
MILLWRIGHT-ALIGNMENT
• Stop the shafts at precise 90° increments and turn the shafts in one direction only (clockwise is the preferred). If you pass the 90° mark, go round again.
• Always try to rotate both shafts together, to maintain the same relative position of dial indicator to coupling.
• Double check all readings taken. If the readings cannot be repeated, they are not acceptable.
• Remove or set the dial indicators clear of the coupling before making adjustments to the drive units alignment. Doing so prevents dial indicator damage, and avoids inaccurate readings, since the dial must be reset correctly before taking the next readings.

Question 7

Using feeler gauges to correct softfoot

Answer 7

1. Remove all old shims and clean the drive base and feet.
2. Reinstall the driver with hold-down bolts left loose
3. Try rocking the drive across the diagonal.
4. Check each foot by attempting to pass a feeler gauge under it. Any foot that does not come in contact with the base is a softfoot.
5. If a 0.003” feeler gauge passes completely under a foot, determine the exact amount of gap and place shims under the foot.
6. If a thicker feeler passes only part way under the foot, an angular softfoot is indicated.

Question 8

Using dial indicators to detect softfoot

Answer 8

1.Remove all old shims and clean the drive base and feet.
2. Tighten the hold-down bolts to their correct torque values.
3. Set the dial indicator contact to read on a mounting foot.
4. Slack off the hold-down bolt for that foot and note the dial reading.
5. Repeat this procedure for all mountings (feet) on the unit.
6. Analyze the readings to assess the softfoot.

Question 9

If selection allows, what is the recommended number of shims used to come to
elevation?

Answer 9

3

Question 10

What is the preferred method of positioning equipment the horizontal plane when performing alignment?

Answer 10

Alignment screws

Question 11

When Jackscrews are used to lift and lower equipment, what must be done prior to tightening the machines hold down bolts?

Answer 11

Remove jack screws

Question 12

Which one of the following lists the correct order for correcting shaft misalignment

Answer 12

Vertical Angular, Vertical Offset, Horizontal Angular, Horizontal Offset.

Question 13

2. What is a recognized method of establishing acceptable misalignment taleranue

Answer 13

Oil analysis

Question 14

Which one of the following is generally installed first during the installations of new machine units?

Answer 14

Drive base