Advanced Alignment Review Flashcards
A tooling ball has a maximum angle of _____ degrees to work with.
95 degrees
benchmark gauges(tooling ball method), monitors the movement of bearing housings or machine casings with respect to the equipment foundation.
When necking down a bolt, how much can you turn down the bolt?
No more than the minor diameter of the bolt.
What does the term Bolt Bound refer to?
Bolt bound is the horizontal condition that occurs when the moveable machine is “bound” by the hold down bolts in the direction of movement needed to correct the horizontal alignment. Can neck down bolt, but no further than minor diameter.
What is Run-out?
Shaft run-out is when a shaft rotates off centreline(wobbles)
What can cause shaft run-out?
Bent shafts, bad bearings, many more.
What would be used to ensure a structure is plumb?
Jig Transit
When measuring elevations with optical tools, the highest elevation will have the ____________ reading.
Lowest
With which dial alignment procedure is shaft end float a potential source of error?
Rim and Face
What is coupling runout a measurement of?
Eccentricity
Before starting the vertical portion of a cross dial alignment, a rough alignment must be completed. What should the horizontal readings taken by both dials measure less than? (remember the dials read 2x the error)
20 mils
What is the maximum allowable soft foot amount for an alignment?
2 mils
What is the purpose for taking a “sweep” reading?
To ensure proper installation of dials
The instrument most commonly used to establish a straight reference line of sight is an:
Alignment Telescope
When referring to alignment procedures, the term plumb refers to a reference aligned;
to the vertical plane
JIG TRANSIT
The procedure for checking the plumb accuracy of a jig transit or a theodolite can be accomplished by using a:
Heavy plumb bob, hanging on a wire, in a bucket of oil
The optical instrument most commonly used to measure angles in two planes is a;
Theodolite
What accessory is required to perform a “bucking-in”?
Precision Lateral Adjuster
What is thermal growth in alignment?
Thermal growth is the relative movement of one machine to another when at operating conditions.
A quick hot alignment is:
Not very accurate.
Proximity probes require;
Cooling water in the stands
What are Dodd bars?
Dodd bars provide continuous, online monitoring, and uses proximity probes that fasten to permanently mounted brackets on the coupled machines housings.
image in module; pump and motor coupled together , a bar attached to both housings above shaft, transmitting to a computer from the 80s haha.
also known as Dynalign.
What are instrumented couplings?
Electronic probes built into the coupling spacer. This arrangement provides online, continuous monitoring of coupling alignment and axial movement of the coupled shafts.
True or False;
The graphing method is accurate when drawn correctly.
True
also;
· Gives a visual picture of the misalignment.
· A dial is zeroed at 12 o’clock and B at 6 o’clock. A read at 6 and B read at 12.
· Preferred method to manually account for thermal growth when growth in not the same at all feet.
When working with lasers, what precaution should you take?
Do not look into the laser unless you want to be Stevie Wonder.
