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Millwright 2nd Year > Crossdial > Flashcards

Flashcards in Crossdial Deck (15):
0

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

180°

1

What is used for horizontal alignment by shifting machine sideways

Jacking bolts

2

What should be done prior to installing dials

Rough alignment

3

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

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

4

How much time should you spend doing a rough alignment

Only the time needed to get it close

5

What should be done after the rough alignment

Check for soft foot

6

What happens when you don't account for bar sag

You have incorrect alignment

7

What is a sweep reading

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

8

Where should you zero your dials before doing a sweet reading

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

9

Vertical moves correct what

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

10

What is the maximum offset misalignment at 1800 RPM

+\-0.002

11

What is the maximum angular misalignment at 1800 RPM

+\-0.0002

12

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

Yes

13

Which dial reads off the fixed machine

The A dial

14

What is another method used for crossdial alignment

Graphical method