8Pt: "If you take an average single cam bow and pull it from the center point axel to axel (as you do)and trace the nock travel then take that same bow and pull it from a point in line with the center of the berger button/rest mount hole 90 deg.(nock point) to the string what will the difference be in the nock travel path trace?"
It actually looks worse as you get away from the center of the string towards the nock position. The higher you would go, the worse it would get. Determining that exact point on the string where the nock would cross the berger hole is more difficult and wouldn't yield data as repeatable/comparable by using the same datum on all bows. Also, while it is on the machine, we can do many other things like check for weak limbs. I hope I have answered your question correctly.
Ossage: "Len I am in Ontario"(I really would have sworn you hailed from Missouri!<img src=icon_smile_wink.gif border=0 align=middle>) "and look forward to being down your way some day." Please, by all means, stop by the shop.
"From what I understand of parts of your explanation of level nock travel, one of those Japanese bows with essentialy radicaly dissimmilar limb lengths would be guilty of unlevel nock travel." Not necessarily so. If I remember what they look like, they have not only different length limbs but also different diameter limbs; thereby making the draw weight different from top to bottom limb. Why don't you send me one of those bows and I'll check it for you? . "Of course with compounds we aren't in Kansas any more, so I don't know what happens there." No, like I said above, I think we're in Missouri! <img src=icon_smile_big.gif border=0 align=middle>
"Len in addition to your extensive testing of nock travel as to where it is present, and by how much, have you been able to track any corelation to performance, and to what degree?" I can tell you that the earlier one cams, as I stated many times, was horrible when compared to the newer one cams. This was, in part, a major problem to good arrow flight and selection. The degree of error was a major variable, as I also said, and correlation would be impossible unless you told me to what we had to compare it. If it wasn't a problem, why then did they "fix" it?????
As I indicated to 8Pt above, the location of the nocking point can have an affect on the nock travel. The one cam showed a much more severe affect than did the two cam bow. For test purposes, I used a one cam and two cam version of the same model bow.
I hope this answers all you questions correctly. Let me know when you're shipping that Japanese bow. <img src=icon_smile_wink.gif border=0 align=middle>