ROYCE: yes you are on the right track with this concept - as to whether the total accuracy and repeatability is there with your "poor man's system" as you call it, I can't comment on that but repeated testing with it should tell you a little about whether that's true. TOM W
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Royce Engler Sent: Wednesday, January 15, 2003 10:11 AM To: [EMAIL PROTECTED] Subject: RE: ShopTalk: Golfsmith Zone Profiling Your comment about load cells caused a BFO for me (Blinding Flash of the Obvious). There has been some discussion on Spinetalkers about radial variations in flexl. I built a "poor man's load cell" to take a look at some of this. I obtained a device called a spin indexer (machine tool that allows you to rotate a shaft fairly accurately), attached it to a firm base, then drilled a UHMW block with a couple of holes so that I could set it on my Golfsmith electronic scale and measure the force when I deflected a shaft upward (in essence, using the electronic scale as a load cell). I haven't tried it at different linear points, but it does a pretty good job of measuring differences in deflection strength in the radial direction. Royce -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of tom wishon Sent: Wednesday, January 15, 2003 10:28 AM To: [EMAIL PROTECTED] Subject: RE: ShopTalk: Golfsmith Zone Profiling ALAN, AL AND ALL: Sorry I forgot one more thing to conclude this when I discovered I better get back to work here - because of the difficulties in making a really sensitive frequency analyzer to do this as precisely as possible (methods of programming on how the counting is done, ie short time vs oscillations or vice versa) and cost for the much more sensitive hardware, I think the future of all this shaft zone stiffness analysis has to revert back to deflection using a load cell type deflection "board" so that you can see the subtle differences in certain areas of shafts. A hanging weight board would never work accurately enough for this. TOM W -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Carl McKinley Sent: Wednesday, January 15, 2003 6:27 AM To: [EMAIL PROTECTED] Subject: Re: ShopTalk: Golfsmith Zone Profiling Al, Alan, All; Just to add to what Al reported. I recall a presentation by Tom W where he touched on this. Seems he had just fitted Scott Verplank with some shafts. After testing Scott complained somoe of the frequencies did feel right. When retesting the shafts Tom discovered a difference in butt frequency and tip frequency. I beleive this is where it got started. Tom, excuse me if I didn't tell this exactly but doubt you have time to clarify right now. Damn, non of those people are with GS any longer, hmmmmmmmmmmmmm;-). Carl --- Al Taylor <[EMAIL PROTECTED]> wrote: > Alan, > A couple of years ago Golfsmith started testing > shafts by measuring them > for frequency at various points along the > shaft. They then tested them on > their Iron Byron. They came to a couple of > conclusions based on ball > flight and ratios(?) (slope?) (the damn > differences!) between a few of > these measured points. The concept, amongst > others, I believe, was to > catalog the shafts and be able to select shafts > based on flight > characteristics. This, I am sure, is > proprietary. Mike Duggan was the > head muckety muck, as I recall, of this > project. He is no longer with > Golfsmith and is now working with Tom Wishon. > > There were several different protocols, in the > form of different measuring > points. I was, at one time, getting involved > in the testing as several > others were. I had to delay my starting of the > tests and have not got back > into it yet. There are several folks that were > doing the same testing, > sans the robot, but not sure if any of them are > members in here. I know > that several are members of the PCS. Hope this > helps a bit. > > Oh, and what they found was that the steeper > the slope between the tip > frequency and the Zone B frequency, the higher > the trajectory. Or, > .......... was it lower? hehehe, I would have > to dig that out from the > junk heap called my shop. > > Al > > At 08:58 PM 1/14/2003, you wrote: > >Can anyone out there explain Golfsmith's 'Zone > Profiling' to me? Butt, > >Zone A, Zone B, and Tip apparently refer to > different sections of the > >shaft, but how are their 'frequencies' > measured and what are they supposed > >to mean? I sort of presume that it has > something to do with the stiffness > >of various sections of the shaft but it is not > clear what they are using > >for a test setup that gives them these > frequencies. > > > >Thanks. > > > >Alan > > ===== Carl Mc Kinley, PCS Certified Class 'A' Clubmaker [EMAIL PROTECTED] P T Barnum is the patron saint of expensive club manufacturers. __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com
