I queried Dynacraft about what they use for the data they publish with their shaft information. They confirmed what I had tentatively decided from their technical write ups. They clamp 2-inches of the butt and 1-inch of the tip, regardless of the length of the shaft (whether it is cut or uncut). The torque values they put in their shaft addendum is for cut shafts. They assume a 5-iron shaft is cut to 37.5 inches, a steel driver shaft to 43-inches and a graphite driver to 44-inches. If your fixturing is open ended you can do cut length measurements on uncut shafts just by adjusting the tip clamp in the proper location and then making sure the distance between the tip clamp and the butt clamp is the same as it would be for a cut shaft (34.5-inches for a 5-iron, 40-inches for a steel driver shaft, and 41-inches for a graphite driver shaft). It is the unclamped length of shaft that matters, and, of course, where on the shaft the unclamped length is located will change your readings some.
If you end up using Dynacrafts setup it would be interesting to know whether your measurements matched what is in Dynacraft's Addendum.
Good luck,
Alan Brooks
At 05:55 PM 11/27/2003 -0800, you wrote:
Jents:
I would like to start collecting some frequency and torque data using a CSIII on various raw shafts. Before I begin, I wanted to ask the group if there are any popular "standards" regarding the beam length when measuring torque. I was thinking of perhaps 40" for woods and 35" for irons.
If anyone has any suggestions please let me know. I realize as long as I do them all the same it shouldn't matter for comparison purposes but I'd like to use an accepted standard (if one exists).
Thanks for your help,
Chris Burns
