coach’s corner | continued from page 5
the cam is. So, you may fnd that the limb is not sitting in the pocket correctly. Either way, you’ll need to put the bow in a bow press to examine the cam or the pocket to determine where the problem is. Remember, if you want to keep the same cam timing, if you twist up 2 turns on the right side of the cam, you have to let out 2 twists on the other side. What you’re after is the top and bottom cams (or top idler wheel and bottom cam on a one-cam) to be perfectly vertical at full draw. To do this, it’s best to use a draw board. (You can fnd a picture of a draw board on another question in the book.) You can check the cam lean at full draw by placing a wooden ruler or a soda straw fat against the cam and rotate it down next to the bowstring. Now look at the space between the two and check to see if it’s parallel to the cable. If it’s not, then put the bow back in the press and twist or untwist the appropriate yoke cable until it’s parallel. Picture 1.2 Cam Lean
Picture 1.3
draw it back to the same draw length. However, if you are an analytical or controller personality and you worry about cam rotation, then it becomes very important. If that’s the case, you need to adjust your cams so they roll over the same (see picture 1.3, right side). This will make the “wall” feel rock solid. A lot of people prefer to make the top cam just a hair faster (1/16 inch or so). This, in conjunction with creep tuning (which helps when shooting up and down hills), should put your mind at ease. (Creep tuning is discussed in another question.)
how iMport Ant is cAM rot Ation?
how do you tune A stAtic yoke?
For some people, it’s not really that important at all because, no matter what happens, the cams roll over the same way each time, if you
If you have a static yoke on the top and the cam lean on top is to the right, you can untwist the yoke on the right side, which will allow the
6 Archery MAgAzine
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December 2011/January 2012
cam to straighten up like it is in picture 1.4. Bear in mind, if you don’t want to alter the cam timing, then however many twists you make on one side, the other side will have to have the same amount of untwists, and vise versa. If you have a yoke on the top, but cam lean on the bottom, then the cam lean on the bottom is probably due to a bad bushing, a crooked axle or, in some cases, the limb isn’t set square with the riser. In this case, you might have to shim up one side of the limb where it goes into the limb pocket at the riser to straighten up the cam lean. If you have a yoke on both top and bottom, then just twist up the right or left side as stated above and do the opposite on the opposing side. Then, check the results at full draw with a draw board, if you have one. If I have a dual cam bow that is