Hi DaveT Allow me to provide some background info. to the question: Earlier this year, I bought some of the new Apollo steel shafts. I found and marked N. Majority, not all were type 1 per bearing spinefinder. I understand in theory that all shafts are type 2 and not type 1 vs. type 2. I evaluated a dozen and they seemed pretty bad. Most rolled ok on a flat table, so not severely bent. Almost every shaft I tested had a severe wobbler on the N-S plane, to the point my GS freq. analyzer wanted to error out. I've never had the freq. analyzer error out from testing a steel shaft before ... why? Turned it 90 degrees and up to 6 cpm difference between N-S and 90 deg. rotation. These steel shafts resembled the graphite shaft demo that is a severe supershaft. Now I have another 'show and tell' shaft, to share with potential customers. Why wobble on N-S plane? Thanks Harry S www.Golf54.com
--- In [EMAIL PROTECTED], "Harry F. Schiestel" <[EMAIL PROTECTED]> wrote: Dave T and others: Can a shaft exhibit severe wobbling (non FLO) on the pure spine plane? Can a shaft exhibit severe wobbling (non FLO) on the pure N1-N2 plane? "The few tests I've seen to determine the effect ... " majority of these tests are absurd and designed by people who have no insight for statistical analysis. In addition, they have a preconceived bias to profit from the results. Even the so called established testing 'experts' leaves a lot to be questioned! Thanks Harry S www.Golf54.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Dave Tutelman > Sent: October 9, 2003 11:37 AM > To: [EMAIL PROTECTED] > Subject: RE: ShopTalk: NBP-COG > > At 09:04 AM 10/9/03 -0500, Dan Neubecker wrote: > >How about shaft concentricity problems where the hole in the center of the > >shaft is offset a bit from center, resulting in different shaft wall > >thickness around the shaft. I'm sure you are aware that they can be > >slightly out of round, even if only for a portion of the shaft... > > Dan, > That manifests itself as a difference in flexibility, or pure spine. It > will show up in a Neufinder, but will also show as FLO, and will show from > differential deflection measurement. > > SNIP / SNIP > > Hope this clarifies things, > DaveT
