Balancing (Discs & Shafts)
Subject
Imbalance in a rotating body will generate an inplane vibration that could cause serious damage if allowed to resonate (see Vibration Damping; Fig 2). Suitably positioned weight(s) will completely eliminate this vibration.
Disc or Wheel
A disc or wheel is considered to be a thin or flat plate, the plane of rotation of which passes through the middle of its insignificant thickness.
A balance weight (one only) is to be located at a suitable radial position in the middle of its thickness.
Shaft
A shaft is a significantly thick plate or long beam; the plane of rotation of which is at 90° to its axis of rotation. Imbalance occurs not only radially but also longitudinally, generating a moment couple that together with a radial imbalance could cause serious damage if allowed to resonate.
The balance weights (two only) are located at suitable radial positions along its length.
Calculator
The balance calculator has two calculation options:
'1Plane' for thin discs
and
'2Plane' for long shafts
Balance allows the user to enter the properties of up to 10 sources of imbalance (positive and negative) and will calculate the magnitude of the counterbalance weight(s) and where to locate it radially and angularly, and also longitudinally (for the 2Plane calculation option).
For help using this calculator see Technical Help
Balance Calculator  Options
1Plane
Calculates the magnitude and angular position of a single weight that would be required to balance a disc of negligible thickness (or length)
You enter: 
and the balance calculator will provide: 


mass (balance)

angle (balance)

2Plane
Calculates the magnitude and angular positions of two weights that would be required to balance a shaft of significant thickness (or length)
You enter: 
and the balance calculator will provide: 


massᴬ (balance)

angleᴬ (balance)

massᴮ (balance)

angleᴮ (balance)

Check minimum system requirements