Why Is Tiller Measurement Important In Bow Making?

Importance of Tiller Measurement in Bow Making

Tiller measurement is a critical step in the bow-making process, especially when working with primitive or traditional techniques. The tiller refers to the thickness of the bow’s limbs, measured at specific points along the length of the stave. A well-measured tiller ensures that the bow’s weight is evenly distributed, which is essential for consistent arrow flight and energy transfer.

To measure the tiller, bow makers typically use a tiller gauge or calipers to take precise measurements along the length of the stave. The most common measurement points are at the handle, mid-limb, and the tip of the bow. For example, a traditional longbow might measure 1/4 inch (6.35mm) at the handle, 1/2 inch (12.7mm) at mid-limb, and 3/4 inch (19.05mm) at the tip.

Techniques for Achieving a Balanced Tiller

To achieve a balanced tiller, bow makers must carefully select and shape the stave. This involves removing excess material from the limbs to create a consistent thickness throughout. The amount of material removed will depend on the type of bow being made and the desired tiller measurement. For example, a recurve bow might require a more aggressive tiller cut to create a steeper limb angle, while a traditional longbow might require a more subtle cut to maintain a consistent thickness.

Sinew Backing and Tiller Measurement

When using sinew backing, a technique that involves wrapping raw sinew around the bow’s limbs to create additional strength and stability, tiller measurement becomes even more critical. The sinew backing process requires a precise measurement of the bow’s tiller to ensure that the sinew is applied evenly and consistently. If the tiller measurement is off, the sinew backing may not provide the desired level of strength and stability, compromising the bow’s overall performance.