Frequency is defined as the shaft “flex feel” of each club to the golfer. It is determined by club length, flexing characteristics, and swing weight. Frequency is a proven and accepted method of club assembly, which in particular can provide golfers with a set of irons that will best control trajectories. The “frequency” of an assembled club is measured in CPM (Cycles Per Minute) on a special machine called a frequency analyzer. Why test for frequency, because not all shafts that are marked “stiff” are really stiff, and not all shafts marked “regular” are necessarily regular, as well for all of the letter markings. The inconsistency can occur with both graphite and steel shafts, however, it appears to be more prevalent with graphite shafts.
A club frequency analyzer measures the stiffness of shafts through what is called “shaft frequency measurement”, which pertains specifically to club oscillation. The stiffer the shaft – the faster the rate of oscillation, the more flexible the shaft – the slower the rate of oscillation. The frequency analyzer is designed to count the oscillation rate in the form of “cycles per minute” (a numerical value), which allows for a concrete data comparison – between different shafts as well as industry standard benchmarks.
In a set of woods or irons, the frequency reading of the shafts in the clubs will normally increase from longest to shortest club in the set. However, due to many factors, the amount of increase from shaft to shaft is not normally in the exact same increment. Frequency does not pertain to club height. It directly applies to shaft flex and the rate of oscillation as measured in CPM’s because that is what the analyzer measures.
The process of having a club set made with the increment increase of frequency (from longest to shortest clubs in the set) precisely the same from club to club is called “frequency matching”. Frequency matching will make the progression of butt-end (grip end) stiffness from club to club more consistent from longest to shortest clubs in a set. However, if the shaft flex, shaft weight, and shaft bend profile are not fit properly to the golfer – then frequency matching will not make major improvement in golfer performance. So, it becomes absolutely necessary to properly fit these characteristics to the average golfer along with frequency matching. Yes, we did mention flex again – due to the fact that shaft flex is matched to a person based upon their individual swing speed.
We do offer this frequency matching service along with properly fitting shaft weight, flex, and bend profile. Our machine analyzer is a valuable tool to consistently measure shaft frequency of both assembled clubs and raw shafts. Frequency Matching does differ from MOI Speedmatching and Flo Plane Orientation, albeit these topics are often intertwined and misunderstood.