Bernie Baymiller <[EMAIL PROTECTED]> wrote:
Ralph,A spinefinder supposedly locates the most flexible plane in a shaft (called a neutral balance plane or NBP) and the stiffest plane in a shaft, which is generally called the spine. The device usually does that well for sheet wrapped graphite shafts (those which are an obvious type 2...with two neutral balance points opposite each other (the plane) on a spinefinder and two spine points opposite each other and 90° from the NBP). But, spine finders will be in error when the shaft is only slightly bent. Most steel shafts and some graphite shafts do have enough bend to throw a spinefinder off target. In this case, the spinefinder will locate the bend point by becoming stable at the outside of the bend.A deflection measuring tool like the DIY Neufinder 4 uses a spinefinder, but had a preload mechanism to overcome this kind of spinefinder error and provides accurate readings of shaft deflection under a specific load.Too much information? :-)----- Original Message -----From: Ralph RSent: Friday, August 11, 2006 11:56 AMSubject: ShopTalk: Spine Finder?What is a spine finder?
