Jim, The NBP rolls to the top, not the spine. If you had a way to measure the stiffness at any point around the shaft, as on a dial indicator which measures in thousandths, you would see that the point at which the shaft wants to rotate either way is the stiffest point on the circumference of the shaft...not the point at which the shaft is stable.
Bernie Writeto: [EMAIL PROTECTED] ----- Original Message ----- From: "Jim & Ivette" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, October 14, 2003 8:23 PM Subject: Re: ShopTalk: NBP-COG > all i have is a tube with two bearings in it and a third free bearing that i > use to load the shaft tip by pushing down on it. the spine rolls to the top > to find its way away from the bend which is on the bottom, by rolling the > shaft while uner a load i can feel subtle differences as i roll it. no > guage, just feel. > ----- Original Message ----- > From: "Bernie Baymiller" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, October 05, 2003 7:41 PM > Subject: Re: ShopTalk: NBP-COG > > > > Jim, > > > > Generally speaking...Steel shafts are almost all Type 1, with one NBP and > > one spine opposite each other. Most graphite shafts are Type 2 shafts > with > > two NBPs opposite each other and two spines 90� from the NBPs. The softest > > NBP, call it the N1, is the NBP you want to use for the NBP-COG alignment. > > When you put a flex on a shaft in free bearings, the shaft rotates to a > > stable point...and the NBP is on top. But, you don't know which NBP is N1 > > unless you have a way to measure the stiffness of that point. A Neufinder > > with a dial indicator to measure deflection is the fastest and easiest > tool > > to measure N1 and N2, as well as S1 and S2, if you want to know the spine > > magnatude. For this NBP-COG alignment, the location and size of the > spine(s) > > don't matter. You are only interested in the N1. > > > > > Then when you put the shaft into the housel and lay it off > > > the end of the table the spine will point up and the NBP will point down > > > towards the COG of the head? Does this sound right? > > > > If you are using a steel shaft, that is correct. I haven't used this > > alignment with any steel shafts yet. Let me know how it works for you and > if > > you see any differences. My friend Harry used Precision Superlites with > this > > alignment and found them to hit the ball much straighter for him (a 90+ > > player). > > > > Bernie > > Writeto: [EMAIL PROTECTED] > > > > > > >
