I would like to thank all the stalwarts who responded to my confusion regarding the relationship between MOI and frequency matching. I now understand what I want to do with the next set of irons I make. However, I must tell you that the information was of very little value during the building of the set I recently finished.
My client was relatively easy to fit, and I had no trouble figuring out what frequency slope I wanted to use for him, and the length and basic flex was also easily determined. He decided, on his own, that he really liked the Golfworks CER 701 heads and left shaft and grip selection up to me. So far, so good. I decided to try the Royal Precision Lite shafts this time because their published data on bend point and tip flex matched the needs of my client. I've used many Rifles in the past but this guy needed a bit higher ball flight and he also didn't want to pay the extra money for Rifles. Now I have a set of Golfworks CER 701 heads (3-PW) and a nice looking set of shafts...I'm ready to work. As usual, I weighed the heads on the old reliable Ohaus triple beam scale...then I went for a beer. It was looking like a long night and I hadn't even trimmed the first shaft! 3i - 241 grams 4i -- 244 5i -- 253 6i -- 262 7i -- 266 8i -- 276.5 9i -- 287 PW - 288 Tip trimming for frequency also proved to be challenging. My normal procedure using my CS III is to use the head I intend to use on the shaft, measure and mark to length and then tip trim until I reach whatever frequency I have in mind for a particular club. Normally, this is a relatively simple process of trim, measure, trim a little bit more, etc. Each time you trim, the frequency will go up for the same clamped length. Imagine my surprise when I found that, if I was aiming for 314 cpm, and read 310 then trimmed another 1/8", I would now read 306 or some other totally unexpected number lower than my starting point. I had to deal with 4 shafts out of the 8 that showed this peculiarity. I eventually was able to trim to the desired frequency, but it was a laborious process! Has anyone else had this experience? Once I had the frequency determined by tip trimming, I trimmed to approximate length, installed a cut grip complete with butt cap and tried to determine what I needed to do regarding swingweight to do MOI matching. Due to the headweights, SW was all over the map! I fiddled with them for awhile, but eventually decided to use lead tape hidden in the large cavity of the CER 701s to get them all to the desired D0 swingweight. Before you tell me that I should have taken the heads back to Golfworks and demanded a better weight sorting you should know that I called them up in Ottawa and got the reply that I was perfectly entitled to return the heads but they were pretty busy at this time of year and it might take them up to a week to sort through their stock to weight match my heads to the desired 7G increments. The topper was when the rep on the phone suggested that maybe I was being too picky..."most golfers won't be able to tell the difference between D4 and C8!" I've built many sets of clubs using Golfworks components, and while I know this isn't their corporate position, I didn't have time to push the case with them. I simply lowered the price to the client on the basis of not being able to do everything I promised, and told him that he was free to return the clubs after 5 rounds if he didn't like them. He called me up after 3 rounds and told me that he was shooting the best golf of his life, and his irons were longer, straighter and felt more solid that the Callaways he paid big bucks for 7 years ago. I thanked him for the compliments, and didn't mention that it wouldn't be hard to build a better set than Callaways. So the client is happy, I'm still ticked at Golfworks quality control, and I still haven't been able to build an MOI-matched set of irons. I guess I'll wait until I build my own set of Tom Wishon's 770s. Time for another beer! Regards, Ron ----- Original Message ----- From: "Dave Tutelman" <[EMAIL PROTECTED]> To: <ShopTalk@mail.msen.com>; <ShopTalk@mail.msen.com> Sent: Tuesday, May 10, 2005 8:45 AM Subject: Re: ShopTalk: Clarification needed > At 03:52 PM 5/2/2005, Ron Kellison wrote: > >If I MOI match can I still build to a predetermined frequency slope or do > >I forget frequency altogether and simply MOI match by adjusting SW? Are > >the two procedures compatible, mutually exclusive or somewhere in between? > > The procedures are compatible. The thing that makes it compatible is that > tip-trim is an "independent control". Depending on where you trim the shaft > (not length, but WHERE on the shaft you get the length), you can affect the > frequency without touching the swingweight or MOI. > > So you can match both frequency and MOI, just as you could match both > frequency and swingweight. > > That said, if you tip-trim as if you were making a conventional > (swingweight-matched) set, your MOI-matched set would still have a > straight-line frequency match. But the slope would be reduced by about a > half cpm per club. (e.g.- instead of 4.3cpm/club, it would be 3.8cpm/club). > That's probably not enough to worry about. > > DaveT > > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.308 / Virus Database: 266.11.7 - Release Date: 5/9/2005 > >
