Rim and Face Shaft Alignment, Grouting, Levelling and Anchoring Flashcards
Runout refers to?
Eccentricity
Misalignment can cause?
- equipment damage
- vibrations
- lost of production
What are the three types of misalignment?
- offset
- angular
- combination
The most common type of misalignment is?
combination
The practice of lining up the shafts of two machines that are or will be coupled to each other is called?
Collinearity
Along with misalignment caused by pipe to a machine connection and weight of fluid in the pipe could cause pipe strain as well as
Thermal change expansion or contraction
What are the three basic types of couplings
- rigid
- flexible
- special purpose
Use elastomer shims to
correct angular soft foot
What is pipe strain and why is it important to correct it?
is when piping attached to a piece of equipment and the weight stresses the machine housing
Machines have various type of seals such as
- lip
- labyrinth
- mechanical
How does end float affect a rim and face alignment/
it causes face readings angularity to be unreliable
The running speed of the equipment and the style of coupling would dictate
how accurate the alignment would have to be
what is the maximum number of shims that can be placed under each foot?
four or fewer
What is bolt bound?
its a situation where the hold-down bolts do not allow sufficient horizontal movement
If a dial indicator is set up to read on the outside (backside) of the coupling face instead of the inside?
Only the sign of the readings changes
You are performing an alignment and find one machine has coupling runout, how do you compensate for this?
Rotate both machines shaft together
The correct term for the condition whereby a machine does not sit properly on all its mounted feet is?
soft foot
When doing a vertical alignment, a positive face reading at the six o’clock position indicates?
the coupling gap is smaller at the bottom
When the dials are mounted, which machine shaft should they be reading off?
the fixed machine
To correct for vertical misalignment you would?
Add or remove equal amount of shims under the front legs and add or remove different but equal amount of shims under the back leg of the MTBM
After alignment is completed jacking bolts should be?
left loose when the alignment is completed
What are vibrations isolators?
they are use to prevent vibrations
What is the most precise spirit level?
the master precision level
What are the two types of grout used in machine installations?
- cement grout mixture
* polymeric
Cement base grouting can be worked after curing for?
7 days
Cement grout reaching full strength after?
28 days
Grout is so stiff that formwork is not require?
false- form prevents the grout from slumping until it sets properly
Should you apply grout to a smooth concrete surface
No, Never
Do not place cement base grout mixtures below what temperature?
5°C
How would you compensate for voids or air pockets remaining under the base?
you need to drill small holes through the base plate in order to release trapped air and prevent voids
What are the disadvantages of polymeric grout?
*synthetic grouts have a shelf life of only one year, and a usable time of only 30 minutes to 1 hour
Before grouting, you should torque anchor bolts to?
50% of their final value
Whether expandable or non expandable the type of anchor bolt being installed determines the?
type of drill
Reference lines are also known as?
- working lines
- control lines
- datum lines
Which anchor is design to accommodate slight adjustment?
flexible
Which anchor bolt can you replace easily if you break it?
boxed
The presents of voids can lead to?
- the base plate twisting under load
- the foundation cracking
- soft foot
What if you detect a void?
it must be filled
What is a wedge?
its a taper piece of steel place between the base and the foundation of the machinery
How should thick and thin shims be stacked?
Thicker ones at the bottom and thinner ones at the top
Leveling feet are used on?
Small light weight equipements
Can you level with a carpenter’s level?
No!– more precision is required
A carpenter’s level can read an accuracy of?
.020 of an inch
A precision or mechanics level has a sensitivity of?
.005 inches per foot
A master precision level has a sensitivity of?
.0005 inch per foot
What are the three mounting methods?
- base plate or skid
- on their own sole plate or steel support
- mounted directly on the floor
Foundations should rest on?
- firm solid ground such as rock, hard clay and compacted gravel
- a footing that covers a large area
- and on piles
Master precision levels should be picked up by the?
top plate
What can affect both plumb bobs and vertical wires?
wind can affect both
Which anchor is best suited for the edge of a concrete foundation?
Adhesives
Expansion-type anchor bolts are popular for use on?
existing concrete floors and pads
If anchor bolts are to be installed before the foundation concrete is poured, what is required?
a template - is required to line up the anchors bolts with holes in the machine base, sole plate or skid
Reference lines are established from reference points such as?
- centre line of machinery
- elevation from plant
- machinery bench mark
- existing machine
List three basic levelling devices
- Spirit levels
- Optical levels
- Laser levels
What do homemade grouts mixtures tend to do?
they shrink
