What Are Frequency Matched Shafts And Why Is It Important?

What exactly is frequency matching? A frequency meter is nothing more that an accurate electronic beam counter. The beam counter (Frequency Meter) displays the number of times the shaft tip breaks the electric beam as it passed though. This number is called CPM (cycles per minute). Once we know the CPM of a shaft, we know its flex. To find out if the shaft has a soft or firm butt, and if the tip is soft or stiff we have to profile the shaft. This is done by measuring the shaft at different lengths. Once this is done we know which shaft to put into what head.

What is accomplished by Frequency Matching; this is tuning the shaft flex to proper flex. A Frequency Meter tells us what the flex is, and Frequency Analysis tells us what needs to be done. Because of the lack of standards, we have no idea what the true shaft flex is. The fact that shafts are labeled A R S XS, or come with a swing speed label, we still don't know the true flex. If you have smooth swing, I build to certain frequency (CPM), if the swing is short and fast I build to another CPM frequency. This will ensure that all the shafts will perform a particular way for each different swing.

The reasons for having the shafts frequency tested, is to overcome the manufacturing problems associated with the process of making shafts. If the shaft's walls are thicker/thinner (asymmetrical) within the shaft, this will change the flex characteristic. The result will be either a softer or stiffer flex. Also, the shaft needs to become progressively stiffer as the clubs get shorter. This progression needs to follow a set CPM slop numerically. The only way possible, is to know what CPM is needed and adjust the shaft accordingly. This is done with a frequency meter.

Frequency Graph for Irons (click to see full sized image)

Frequency Graph for Woods (click to see full sized image)