Motor Leveling
Soft foot Condition:
One or more of the mounting feet is not level with the
others.
Nuts loosen, vibration, misalignment
Metal fatigue, causing cracks
MECH 1200
Motor Leveling
Initial Corrections to Soft Foot:
Clean where the feet will rest
Set the machine in place
Attempt to pass a thin feeler gauge under each foot,
If it can fit beneath it, determine gap size and place a shim.
Final Corrections to Soft Foot:
Tighten motor mounting nuts
Place a dial indicator vertically above the foot that you are
checking. Set indicator to zero and watch the dial for
movement (repeat to others if necessary)
Shim if larger than .002 for large motors, and .010 for small
motors
MECH 1200
Motor Leveling
MECH 1200
Shaft Run-Out
Measure by placing a dial indicator on the shaft and
rotating the shaft.
Total variation is called the total indicator reading (TIR).
If the run out is greater than 0.002 inches, motor should
not be used. Shaft may be bent or bearings are worn.
End Float
Movement along the x-axis
Measure by placing indicator on the end of the
shaft
Typical end float is 0.001 inches
Motor Leveling
Motor Leveling
1)
Place level on top of the motor shaft
2) place one of more of the leaves of a feeler gauge
under one end of the level which are necessary to
make the horizontal bubble centered
3) Find the ratio of the distance between the centers of
the motor mounting bolts and the length between on
end of the level and the edge of the feeler gauge.
4) Multiply the feeler gauge leaf thickness by ratio in step
#3
5) Shim under the low end of the motor by the amount in
step #4
MECH 1200
Motor Leveling
Motor Mounting Procedure
1)
Clean motor base and other surfaces
2)
Check and correct initial soft foot
3)
Position motor over holes on bedplate
4)
Attach bolts, nuts and washers. (Criss-Cross)
5)
Check for final soft foot
6)
Tighten bolts again
7)
Level the motor end to end
8)
Check the motor for run-out and end float
MECH 1200