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Old 05-04-2004 | 07:47 AM
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JeffB
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Joined: Feb 2003
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From: CT, USA
Default RE: Could someone explain the Cam & half?

Possibly. Depends on how “on” the bow was in the first place. You could make it worse, you could make it better.

However my comment was geared more towards a term called “flex modulus”. Which I am only familiar with in a general sense, but itwas explained to me by some industry-folk/engineers. But it basically comes down to the fact that ALL limbs have some inconsistencies and imperfections due to their makeup. They flex at very slightly different rates even on bows with what many would consider “perfectly” matched limbs. In essence: to get every single bow in a production run exactly the same as regards to nock travel, you would basically need to swap limbs matching it with different cams/cam, make sure string and cable lengths are absolutely perfect, and then test each individual bow for nock travel to see it was correct. If it wasn’t perfect, then you’d need to swap out another pair of limbs, or perhaps there’s a very small (normal) deviation somewhere else in the bows makeup (cams,idlers, normal machining tolerances, etc) that’s causing the problem. The better the tolerances, the less variation you will have.

So chances are that even if one bow X has perfect level nock travel, the next bow X may not. If the company is known for super tight tolerances, then most likely it will be very,very close from bow to bow to bow..as perfect as can reasonably be (and IMO, nock travel is somewhat overrated), but only when extreme attention is applied to each and every bow will you get perfect results from each and every bow. This unfeasible for most manufacturers since they cannot reasonably devote so much time to each and every bow when producing them by the tens of thousands. So you likely will get a few perfect ones in a run of bows, a bunch of good ones, and some that are “acceptable” (or not, depending on the individuals own regard for the importance of nock travel).

This is why in the past few years I’ve become more tolerant of less than optimum nock travel. It’s a good thing to have for sure, but I suspect that most folks (including myself) are not getting it right out of the box even with bows that are supposed to have it. It’s going to require a little or a lot of tweaking, and since most people don’t have access to the proper equipment (either a tuning machine if you are believer of the static test, or a high speed camera if you feel dynamic nock travel is more important), then for most folks it’s just “peace of mind”. There are tangible benefits, but do you know if you are getting them, or do you just assume so? In your case SA, you might have actually made the nock travel worse or better, but what you did was fine tune it to where it shoots best for you as an individual. Which in essence is the real key AFAIC.

Sorry to go off on a tangent and hijack the thread..it was not my purpose.
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