For a better understanding of balancing, it is necessary to have an understanding of its terminology and its fundamental concepts.
CENTER OF GRAVITY
AXIS OF ROTATION
bearings all allow or cause variations in the position of the rotation axis. Any variation of the axis appears to be motion of the mass center with respect to the axis and contributes to non-repeatability.
With rigid bodies the unbalance remains the same although an increase in speed causes an increase inforce. The increased force will in turn cause increased motion depending on the stiffness of the shaft orthe shaft supports. Force increases exponentially as the square of the change in speed. Twice the speedequates to four times the force and four times the motion.
MOMENT AND COUPLE
A couple is a system of two parallel forces, equal in magnitude and acting in opposite directions. A couple causes a moment or torque proportional to the distance between the parallel forces. Its effect is to cause a twisting or turning motion.
WEIGHT AND MASS
generally acceptable provided the balance computer displays units that are consistent or easily
converted to those of the weights in use or the scale used to make the weights. The distinction between
weight and mass becomes an issue when calculating unbalance force. It should be understood that
weight and force have the same units; Newtons (N) in the metric system and pounds (lbs) in the English
system. Mass has the units of grams (g) or kilograms (kg) in the metric system and slugs in the English
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