2
SBS System – SB-1000 Operation
Balance Theory
The SBS Balance System operates on the principle of mass compensation for any given grinding wheel’s
imbalance. The Intrinsic Imbalance of a grinding wheel is equal to its mass multiplied by “
e
”, the distance
between the wheel’s center of mass and the wheel’s center of rotation.
The imbalance of a grinding wheel is determined in practice by use of the Measured Imbalance of the wheel.
The Measured Imbalance is equal to the product of the mass of an attached balance weight, located to
balance the grinding wheel, multiplied by “
r
” the distance between that weight’s center of mass and the
grinding wheel’s center of rotation. In both cases, the imbalance is given in terms of a mass multiplied by a
distance, with (grams)(centimeters) being the units used for reference by the system.
The SBS system with SB-1000 control can operate in either Automatic Balance mode, or Manual Balance
mode in order to correct for wheel imbalance.
Automatic Balance Overview
In automatic balance mode the SBS Balance
System uses two movable weighted masses
located in the Balancer to correct for various and
changing imbalances which occur on the grinding
machine. The balance weights are driven by high
torque electrical motors through a precision gear
train, and can be independently positioned to
compensate for any imbalance within the
specifications of the system.
The automatic balance cycle is complete when
the balance weights are positioned so that
minimum vibration is achieved. Figure 2a shows an unbalanced rotating grinding wheel, with an SBS
Balancer installed. The imbalance is represented by the white dot located on the circumference of the wheel,
while the two black dots represent the weights located in the balancer. By incrementally repositioning the
weights, a triangulation is achieved which cancels out the imbalance, as shown in Figure 2b.
The system consists of the
Balancer, a Balancer Cable, a
Vibration Sensor, and the SB-
1000 Control Unit. Imbalance is
expressed as spindle vibration
detected from the grinding
machine by the sensor. The
vibration signal from the sensor is
transmitted to the control unit,
Intrinsic
Imbalance
= e (
)
Wheel Mass
Measured
Imbalance
= r (
)
Balance
Weight
Mass
= Center Rotation to Wheel Center of Mass
= Center Rotation to Balance Mass
Sensor
Balancer
Balance Control Unit
Input
Signal
Motor Drive
Signals
2a - Unbalanced
2b - Balanced
