Except for large boring bars and similarly off-center cutting tools, machinists once gave little thought to toolholder balancing. Those simpler times are long behind us as spindle speeds grow ever higher, tolerances tighter and the cost of an unexpected spindle failure increasingly unacceptable.
“We balance all of our toolholders to G2.5 at 25,000 rpm, or 1 gram millimeter, whichever comes first.”
That’s according to Jeff Wills, group manager for tooling components for Schunk USA, who says the company fields many questions about tool balancing. That’s somewhat surprising, considering the G2.5 specification is approaching its 50th birthday.
50 Years of Balancing Standards
Manufacturers have long recognized the need to quantify the unbalance present in rotors, turbine shafts and other rotating machinery components. The result was ISO 1940-1, “Balance quality requirements for rotors in a constant (rigid) state,” first published in 1973.
It defines 11 balancing grades, ranging from G4000, suitable for the large diesel engines used on marine vessels, to G0.4, required for gyroscopes and scientific instruments.
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