Crossdial Flashcards
What is used for horizontal alignment by shifting machine sideways
Jacking bolts
How many degrees are dial indicators mounted across from each other in the crossdial method
180°
What should be done prior to installing dials
Rough alignment
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
How much time should you spend doing a rough alignment
Only the time needed to get it close
What should be done after the rough alignment
Check for soft foot
What happens when you don’t account for bar sag
You have incorrect alignment
What is a sweep reading
Ensures that the dials are balanced and that the crossdial set up is correct
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
Vertical moves correct what
Angular and offset misalignment in the vertical plane by shimming the machine to be moved
What is the maximum offset misalignment at 1800 RPM
+-0.002
What is the maximum angular misalignment at 1800 RPM
+-0.0002
Is horizontal alignment of two machine shafts more accurate for vertical readings?
Yes
Which dial reads off the fixed machine
The A dial
What is another method used for crossdial alignment
Graphical method
