Instalation and Leveling Flashcards
A baseplate provides a ridged and _______ structure which enables the machine units to be aligned during operations
Level
The primary unit is also referred to as the ________ unit. Usually installed first.
Driven
Prime movers are all referred to as ________ .
Drives or drivers
A benchmark is a reasonably permanent character and are used as _________ ________ in surveying and by the millwrights.
Reference points
Datum points are known points from which any ______ or scale starts.
Measuring
Primary equipment is installed first then transmission units and finally _________ units.
Drive units
Basic installation, alignment, and testing takes place in this order:
Prepare machine and mounting surface
Move equipment into place and prepare it
Set primary unit
________________
________________
Lubricate, power and test equipment
Set transmission unit (gearbox)
Set primary mover unit (motor)
When mounting on structural steel what thickness should the metal be?
Thickness of metal base should be equal to or greater than the thickness of the unit feet
Vibration isolators have 2 functions:
Prevent machine vibrations from being transmitted to adjacent equipment
And
____________________
To prevent the amplification of internal stresses which cause misalignment and wear of machine elements
What is the general rule of thumb for the amount of concrete needed to support a machine?
2.5 times the mass of whatever sits on top of it
The foundation is usually constructed with a minus elevation of 19mm to 38mm(3/4to1 1/2)
True or false
True
A basic way to minimize and prevent vibration transfer is to use large well designed foundations. The foundation may be isolated from the floor with dead airspace or vibration insulators such as cork or felt.
True or false
True
Straight anchor bolts without deformed ends should be set to a depth of ________ times their diameter.
25
The length of the bent end on a anchor bolt should be _______ times the bolt diameter.
4
In situations of severe vibration a __________ anchor bolt system should be used.
Boxed
Two types of expansion anchors commonly used are:
Stud type
And
___________
Drop in
When setting the height of an anchor bolt what must be considered?
Thickness of the baseplate
_________________
Grout
Washers
1 or two nuts
Shimming
What are bolts typically torqued to?
2/3 their yield strength
One method of preserving reference lines is to us a ________ plug and grouted. The lines can be prick punched into them.
Brass
Establishing _________ lines and points is the first step in any installation alignment procedure.
Reference
The two methods of establishing reference lines square to each other are the Swing arc method and the _________ method.
3-4-5
Why would you hang plum bob in a pail of oil?
To dampen and oscillations caused by air currents
Baseplates may be set on foundations with or without machinery units attached. Soul plates are alway set ___________ machinery units attached?
Without
Why do jacking screws and bolts get removed after grout has cured?
Ensures that the baseplate is supported by the grout and shims
It is not recommended to stack more than 3/8’s thick when using 1/8” spacers.
True or false
True stick to as little shims as possible. Typically 3 and max 4
When levelling a machine you set the elevation to the ____________ point
Highest
Raise all the lower points up
Formula for calculating thickness of adjustment shims needed?
Not the same formula as rim and face
A = T x (L1/L2)
A = shim adjustment required
T = thickness of feel blades
L1 = bolt hole centre to centre
L2 = length of level
Always torque anchor bolts to ______% of their torque before checking level.
50
Construction lasers are only good for rough millwright work. It is only accurate to +/- ______ of an inch, while a precision rotating laser is accurate to ________ of an inch over a 10m distance
3/16”
.01mm or .0004”
Two types of grouts used are:
Cementitious - Portland based
And
_______________
Polymeric grout filler -epoxy or polyurethanes
Advantages of polymeric grouts are moisture insensitive, resistant to corrosion impact vibration and chemicals, and have high ________ strengths
Compressive
Before placing grout you must:
Clean off all dirt, oil or grease and loose materials
Roughen the surface
Make sure the area is above 5 degrees C. Must be heated if not with the exception of urethane grout which can be place at temps as low as -10c
When using cementitious grout the surface must be wet but no standing water
Grout has attained full strength in _______ days and can be torqued to full value.
3-7 days
