Why Is My Bow String Wearing Unevenly After Tuning?

Imbalanced Cam Timing

One common issue is imbalanced cam timing, where the left and right cams are not synchronized. This can be caused by incorrect cam settings or worn-out cam components. To check cam timing, use the paper tuning method. Place a piece of paper between the string and the cam, and draw the bow. If the string is consistently touching the paper on one side, it indicates imbalanced cam timing. Adjust the cam settings to ensure the string is centered on both sides.

Arrow Rest Adjustment

Another possible cause is an improperly adjusted arrow rest. If the arrow rest is not aligned with the bow’s centerline, it can cause the string to wear unevenly. Check the arrow rest’s position and adjust it accordingly. A general rule of thumb is to set the arrow rest at a distance of 1/8 inch (3-4 mm) from the bow’s centerline. Use a ruler or caliper to measure the distance and adjust the arrow rest as needed.

Walk-Back Tuning and String Wear

Walk-back tuning is a technique used to adjust cam timing and string draw. However, if the cam timing is still imbalanced, walk-back tuning can exacerbate the issue. To avoid this, use a combination of paper tuning and walk-back tuning to fine-tune the cam timing. When walk-back tuning, make small adjustments (1/8 inch or 3-4 mm) and re-tune the bow after each adjustment. This will help you identify the optimal cam timing and prevent uneven string wear.