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Millwright 2nd Year > Crossdial > Flashcards

Flashcards in Crossdial Deck (15)
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0
Q

What is used for horizontal alignment by shifting machine sideways

A

Jacking bolts

1
Q

How many degrees are dial indicators mounted across from each other in the crossdial method

A

180°

2
Q

What should be done prior to installing dials

A

Rough alignment

3
Q

Why should you rotate coupling 360° when dials are first installed

A

To ensure the plunger makes contact with the coupling rim throughout the full rotation

4
Q

How much time should you spend doing a rough alignment

A

Only the time needed to get it close

5
Q

What should be done after the rough alignment

A

Check for soft foot

6
Q

What happens when you don’t account for bar sag

A

You have incorrect alignment

7
Q

What is a sweep reading

A

Ensures that the dials are balanced and that the crossdial set up is correct

8
Q

Where should you zero your dials before doing a sweet reading

A

The A dial at 12 o’clock and the B dial at 6 o’clock

9
Q

Vertical moves correct what

A

Angular and offset misalignment in the vertical plane by shimming the machine to be moved

10
Q

What is the maximum offset misalignment at 1800 RPM

A

+-0.002

11
Q

What is the maximum angular misalignment at 1800 RPM

A

+-0.0002

12
Q

Is horizontal alignment of two machine shafts more accurate for vertical readings?

A

Yes

13
Q

Which dial reads off the fixed machine

A

The A dial

14
Q

What is another method used for crossdial alignment

A

Graphical method