describes about types of balancing machines , its benefits and how its works

2. Basics
 The process of providing the second mass in order to counteract the effect of
the centrifugal force of the first mass is called balancing by doing so the
centrifugal forces are reduced, minimizing vibration, noise and associated
wear.
 The more the unbalance ,the greater the force and thus the greater the
amplitude of the vibration.

3. Unbalances
 . Principal Inertia Axis
CG
Geometric Centerline
• Static unbalance – where the PIA is
displaced parallel to the geometric
centerline.
• Dynamic balance - sometimes called
two plane balance
The sum of forces must be zero
And the sum of moments must also be zero

4. Types of balancing machine
 Hard-bearing
 In a hard-bearing machine, balancing is done at a frequency lower
than the resonance frequency of the suspension.
 Versatile and suitable for the parts having different weights.
 Requires one time calibration.

5.  Soft bearing
 In a soft-bearing machine, balancing is done at a
frequency lower than the resonance frequency of
the suspension.
 Non versatile, time consuming

6. How it works
• a vibration sensor is attached to the suspension. In most soft-bearing machines, a velocity
sensor is used
• (proximity sensor) or encoder is used to determine the rotational speed, as well as the relative
phase of the rotating part, determine the amount of movement, or force, in one rotation of the
part. Also, the time difference between the phase and the vibration peak gives the angle at which
the unbalance exists. Amount of unbalance and angle of unbalance give an unbalance vector.
• Calibration is performed by adding a known weight at a known angle. In a soft-bearing
machine, trial weights must be added in correction planes for each part.

7. Advantages
 Minimize vibration
 Minimize noise
 Minimize structural stress
 Minimize operator fatigue and annoyance
 Increase machine life
 Increase bearing life
 Increase product quality
 Increase personnel safety
 Increase productivity