miter-wheel

from The Century Dictionary.

• noun A friction-gearing or -wheel of which the working face is at an angle of 45° to the axis.
• noun In mech., a particular kind of bevel-wheel, the bevel being limited to an angle of 45, and the teeth of the wheel meshing with the teeth of another of the same bevel and diameter.
• noun In glass-cutting, a wheel used for cutting a groove of triangular section.