Re: ShopTalk: shaft flex v.s. frequency

[Al Taylor]

Thanks Dave. I usually take John, with a shot of his current scotch, but never doubt your good self. Happy holidays to you and the family.

Al

At 04:58 PM 12/26/2002, you wrote:

At 04:32 PM 12/26/02 -0500, Al Taylor wrote:

I'm impressed. I have no clue if you answered my question, but I was impressed. John, you still there? ;-)
Al

OK, John and Alan and I all said, counterintuitive as it may seem, yes it bends exactly the same TOWARD and AWAY FROM the spine, as long as it's in the same plane.

You could weld a small steel rod to the shaft, to give it as stiff a spine as you want. It will still have exactly the same stiffness in BOTH DIRECTIONS in the same plane.

Twirling it in a spine finder might or might not say that. But measuring the REAL stiffness will. I have posted here how to measure true stiffness, several times over the past week.

Hope this answers it.
DaveT