Re: ShopTalk: History of Frequency

[Lloyd Hackman]

Peter T   I built my first frequency meter in 1972 and still use it, except that I have changed the clamp length to the more standard 5" instead of the original 8" I used. By knowing the frequency of the first mode of vibration of the golf club you can relate the time of one quarter of a cycle to the time between club release in the swing and ball impact. It is this time that the club must return from the flexed position or peak load back to straight and square at ball impact. I am not allowed to say what fitting system dose that for you but there is one. Initially the frequency meter was only used to match clubs in a set. This frequency was the best measurement of club stiffness because it included shaft stiffness, club length and club weight all as a single parameter. When I looked at patenting a frequency meter in 1973 I found a Patent had already been issued to a fellow in England who worked for Swillkin Golf. They used it to build and match flatline sets of clubs. I you want more information about the English patent I have a copy of it at my house in Florida. I will be back there in about 3 to 4 weeks.   llhack    ----- Original Message ----- From: Peter T. Sabin, neoGolfMatching To: [EMAIL PROTECTED] Sent: Thursday, September 05, 2002 8:04 PM Subject: ShopTalk: History of Frequency Can anyone recall when the frequency of a shaft/club became a recognized standard for matching or building clubs? I am puzzled as to why this measurement became a clubmaking and fitting tool. My understanding is that frequency is, in essence, the resonant frequency of a shaft/club. If so, it escapes me as to why this has an effect on the golf swing. I can understand how the period of a finished club (i.e. the time it takes to complete a cycle when allowed to swing about the axis point) affects the golf swing. But the resonant frequency? I don't understand. A little history would be great. Thanks. -- Peter T. Sabin (aka phineasToad) neoGolfMatching eMail: [EMAIL PROTECTED]