Quick Answer
To determine the right spine for arrows, measure the deflection of the arrow after being shot at a distance of 28 feet with a consistent draw weight, aiming for a deflection of 1/2 inch or less. This allows for consistent arrow flight and penetration. Use a combination of materials, such as cedar or osage orange, and adjust the tillering process accordingly.
Choosing the Right Spine
When selecting a spine for your arrows, it’s essential to choose a material that can absorb a significant amount of energy. Cedar is a popular choice due to its lightweight yet strong properties, with a recommended spine of 300-400 grains for most archers. Osage orange, on the other hand, is heavier but offers improved durability and is often used for longer arrows.
Measuring Deflection
To measure the spine of your arrow, shoot it from a consistent distance of 28 feet with a draw weight of 40-50 pounds. Use a deflection gauge or a piece of string to measure the deflection of the arrow after it hits the target. A deflection of 1/2 inch or less is ideal, indicating a well-tuned arrow with minimal vibration.
Adjusting the Tillering Process
To achieve the right spine, you’ll need to adjust the tillering process accordingly. If your arrows are deflecting too much, you may need to thin the arrow by 1/16 inch or more at the midpoint, followed by a gradual thinning towards the tips. Conversely, if the arrows are not deflecting enough, you may need to thicken the arrow by 1/32 inch or more at the midpoint, again followed by a gradual thickening towards the tips.
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