[Jeff]

Toolish

I should have stated Iron Byron-type machines.

I have never seen the original Iron Byron machine. I have only seen one version of that type of club-testing machine at our local golf practice facility. It is a very advanced machine, which they call Robo-Fit. It has an universal joint that allows the clubshaft to rotate about its axis.

chbkk

I don't have a conclusive answer as to how the clubhead swivels automatically in an Iron Byron-type machine that has an universal joint. I have previously thought that it relates to the COG of the clubhead's mass relative to the hosel, and I have presumed that the offset COG of the clubhead causes the clubhead to swivel around the clubshaft's axis. If you establish a conclusive explanation, please let us know.

Here is a link to the company that makes the machine.

http://www.golflabs.com/home.html

Here is a link to a comment about the wrist joint

http://www.golflabs.com/robot_sales_2.html

I wonder if nmgolfer can work this problem out mathematically.

Jeff