SPINING RELATED

[That Bob Guy]

Spine & NBP

Hey,

Sorry to be a pest!

In relation to the spine, where is the NBP of a shaft?


Thanks

[wrmiller]

NBP is the natural bend plane (point?) of the shaft. Normally the weakest and lowest frequency axis of the shaft.

Spine refers to the most stable axis of the shaft, approx 90* from, or perpendicular to the NBP. Usually found with a laser, or measuring for highest frequency.

[That Bob Guy]

[quote name='wrmiller' timestamp='1323049964' post='3892213']
NBP is the natural bend plane (point?) of the shaft. Normally the weakest and lowest frequency axis of the shaft.

Spine refers to the most stable axis of the shaft, approx 90* from, or perpendicular to the NBP. Usually found with a laser, or measuring for highest frequency.
[/quote]

Hey,

Thanks for the resonse. I've just purchased a laser frequency machine to fart around with, so if I was to, say quarter the shaft,

and take and compare CPM's, I could determine these planes?

[wrmiller]

I've not used a frequency machine, but yes, you should be able to do this. Or so I've been told... (disclaimer)

I use a 'spine' finder to find the NBP, then a laser to find the FLO or stiffest/most stable axis. This, I'm told, is the highest frequency plane of the shaft.

Quartering shouldl get you close. You may have to fine tune your adjustments to accurately find the highest frequency plane.

[That Bob Guy]

[quote name='wrmiller' timestamp='1323092033' post='3893901']
I've not used a frequency machine, but yes, you should be able to do this. Or so I've been told... (disclaimer)

I use a 'spine' finder to find the NBP, then a laser to find the FLO or stiffest/most stable axis. This, I'm told, is the highest frequency plane of the shaft.

Quartering shouldl get you close. You may have to fine tune your adjustments to accurately find the highest frequency plane.
[/quote]

... what do you use for a laser, and where did you get it? I've been looking for a tip mounted laser, and can't seem to find one. I have a spine finder coming from Toolz Unlimited.

Anyone have any ideas?

[wrmiller]

Sorry, I don't remember the forum, but mine was made by boring out the front of a tip weight and stuffing a small laser pointer in it. I don't even remember who built it.

[bl8d]

[quote name='TheBobGuy' timestamp='1323010481' post='3889231']
Hey,

Sorry to be a pest!

In relation to the spine, where is the NBP of a shaft?


Thanks
[/quote]

bobguy , mount the shaft in a vise,attach a laser to the tip(plus weight) . Turn and twang the shaft vertical or horizontal (it doesn't matter) till you establish a straight line pattern with the laser. Mark the shaft and turn it 90º and you should find another straight line oscillation pattern.(on Graphite shafts)
The frequency meter reading will help identify which of the two is the stronger plane(higher cpm). The weaker of the two will be the NBP(neutral bend point) Set this in the 9-3 plane.

[That Bob Guy]

[quote name='bl8d' timestamp='1329404860' post='4299181']
[quote name='TheBobGuy' timestamp='1323010481' post='3889231']
Hey,

Sorry to be a pest!

In relation to the spine, where is the NBP of a shaft?


Thanks
[/quote]

bobguy , mount the shaft in a vise,attach a laser to the tip(plus weight) . Turn and twang the shaft vertical or horizontal (it doesn't matter) till you establish a straight line pattern with the laser. Mark the shaft and turn it 90º and you should find another straight line oscillation pattern.(on Graphite shafts)
The frequency meter reading will help identify which of the two is the stronger plane(higher cpm). The weaker of the two will be the NBP(neutral bend point) Set this in the 9-3 plane.
[/quote]

Hey,

I have purchased a frequency machine. Generally speaking, what would be the difference in CPM's between the strong and weak planes?

[bl8d]

[quote name='TheBobGuy' timestamp='1329654568' post='4322207']
[quote name='bl8d' timestamp='1329404860' post='4299181']
[quote name='TheBobGuy' timestamp='1323010481' post='3889231']
Hey,

Sorry to be a pest!

In relation to the spine, where is the NBP of a shaft?


Thanks
[/quote]

bobguy , mount the shaft in a vise,attach a laser to the tip(plus weight) . Turn and twang the shaft vertical or horizontal (it doesn't matter) till you establish a straight line pattern with the laser. Mark the shaft and turn it 90º and you should find another straight line oscillation pattern.(on Graphite shafts)
The frequency meter reading will help identify which of the two is the stronger plane(higher cpm). The weaker of the two will be the NBP(neutral bend point) Set this in the 9-3 plane.
[/quote]

Hey,

I have purchased a frequency machine. Generally speaking, what would be the difference in CPM's between the strong and weak planes?
[/quote]

Bobguy, can't give you a definitive answer because it varies, suffice it to say that you are looking for a difference of more than 4cpm. The highest cpm number is designated as the S1-S2 plane(hard spine) usually set on the 12-6 plane, 12 at your feet, 6 pointing up at you. The weaker (lower cpm) NBP is the 9-3 plane, where 9 is at the target.

check the Tutelman site for invaluable info.http://www.tutelman.com/golf/shafts/fmatch.php?ref=clubmakeronline

BTW, if you can't find a difference of more than 2cpm it means it can be aligned any way you want it. There are the rare instances where some shafts do not exhibit a spine of any consequence. The old Mercury shafts were renowned to be stable on almost any orientation.