Besides X-axis, Y-axis and Z-axis, a 4-axis machine has another axis usually called A-axis, which supports up/down movements of the worktable. So, which brush models are made by 4-axis machines? Spherical toilet brushes, double-side hockey brushes and wavy brooms are the most typical ones. However, you might be interested to know another small tip that a flat broom tufted by a 4-axis machine is far more beautiful than that tufted by a 2-axis machine, because a 4-axis machine can make filaments tilting at different angles which could be adjusted in program, while a 2-axis machine tufts filaments only vertically at 90 degrees.