----- Original Message ----- From: "Jim & Ivette" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, October 13, 2003 9:02 PM Subject: ShopTalk: NBP-COG
> Bernie, can you break this down for me a little more, im not following it > exactly, maybe? i have a spine finder made out of atube with two free > bearings and a third tip bearing. i push the tip down untill it rotates to > show the spine. how does that relate to what you are saying. - Jim > I am not Bernie but I'll try to answer. If you find one spine with your finder, the NBP should be 180� opposite. It will usually be pointing straight up when the shaft is at rest in your spinefinder. If you have two spines 180 apart, then your NBP is between them, hopefully 90�. These are usual scenarios, but there are exceptions. The basic thing is that NBP is (up) where the shaft wants to sit when it is under tension in the spinefinder. Anyway, if you use that info to find NBP, then you take Bernie's instructions from there. NBP stands for natural bending point or plane, something like that. If I'm wrong someone will correct me. I got this from the Spinetalk list a couple of years ago and haven't really kept up with any updates. Pretty interesting theory, Bernie. The more I mess with spines and scratch my head about how to orient the shafts, the more I appreciate shafts that don't have spines. I suppose a strong spine properly aligned, whatever that means, might be better than anything. But it's hard to get bad results with no spine. I just wish I could find more shafts like that.
