Crosscut saw into the wood. Many sawtooth patterns have four cutters; each cutter that cuts to the left of the blade is paired with another that cuts to the right of the blade. Adjacent to the cutters there is generally a raker. The void on either side of the raker is known as the gullet. A raker is what does the actual removal of the wood that is being cut. The raker follows the cutters, paring the bottom of the kerf like a chisel or plane. As the raker pares the bottom of the kerf, a strip of wood is lifted upward,
Twist per inch find the number of twists per inch for the single, or one can use the doubled back yarn as a measure. With a thick-and-thin yarn, it is best to count the twist over several inches and average the results. This is because the number of twists per inch will tend to vary between the thin and thick sections. In the industry the number of twists per inch is calculated as: formula_1 where formula_2 is the Twist Multiplier, also known as formula_3 or the Twist Factor. This Twist Multiplier is an empirical parameter that has been established by experiments and practice