BALANCE ERRORS AND BALANCING
Definition of balance error
Rotational axis
≠
mass axis
Rotational axis = mass axis
A balance error occurs when the rotational axis of a
rotor part does not correspond to its mass axis.
Reasons for Balance Errors:
uu
Indexing seat for tool changer in SK and HSK
uu
Driving slots in SK and BT
uu
Driving slots in HSK- A, C, CE
uu
any kinds of flats on tool shanks
uu
Locking srews for tool shanks with flats
uu
Non-uniform pitch on cutting tools
uu
Collets and tightening nuts
uu
Production tolerances
Balance errors can be eliminated either by adding material
or by drilling corrective holes to remove material. See illust-
rations of corrective drill holes below:
Unbalanced arbor
Balanced arbor with corrective
drill hole
Balancing by drilling
corrective holes. Sam-
ple calculations and
detailed illustration, see next
page.
8
Balance errors and balancing
