Broaching machines use tools made of multiple teeth to push and/or pull along a surface, cutting a set amount of material in a set shape. A broaching machine is basically a combination of a saw and a planer. It can be used to cut a shape in a single pass or as a way to finish surfaces.
Due to the simplicity of the machine movement, broaches can be highly accurate and provide superb repeatability. They are often used for high production runs. Broaches can handle high volumes very quickly because the roughing cut and the finishing cut are often done in the same pass.
Broaching machines are also very versatile, able to cut in many different shapes, both internally and externally.
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The broaching machine serves to move the broach itself back and forth against the workpiece. This can be done either vertically or horizontally, internally or externally. Broaches may have any sort of shape, as pictured above, and can be either flat, cylindrical, or irregularly shaped.
Whatever their shape, each tooth of the broach is longer than the previous one, so that it cuts slightly deeper into the workpiece.
Push Broaches are vertically oriented, where force is applied downward into the workpiece.
Pull Broaches can be either vertical or horizontal, and the workpiece can either be stationary or pulled along the broach like a cheese grater.
Internal Broaches need a starter hole, but are otherwise very versatile.
Surface Broaches are specialized broaches used for making flat or contoured surfaces. The amount of material removed may be extremely small.
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