GOLF CLUB EVALUATING METHOD AND GOLF CLUB

摘要

PROBLEM TO BE SOLVED: To allow the golf evaluating method to sufficiently function as one item of quality management in the manufacturing process of a golf club and to precisely evaluate the golf club by using the hardness of the golf club shaft and an index expressing the height of a hit ball obtained by a golf club shaft. SOLUTION: In the case of evaluating the golf club which has a golf club head mounted on the end of the club shaft which is provided with a grip or a grip part at the rear end of the golf shaft, a primary resonance frequency in the case of vibrating the golf club shaft with one of the tip and the rear end as a fixed end and with the other end as a free end is used at least. The sum and ratio of the primary resonance frequency with an obtained tip as the fixed end and the primary resonance frequency with the rear end as the fixed end or the ratio of the primary resonance frequency and a secondary primary resonance frequency are obtained.