mitering-machine

from The Century Dictionary.

• noun In carp, and joinery, a machine for sawing or cutting to a true angle of 45 the ends of pieces to be joined, in order that they may be united by a miter-joint, or for cutting the pieces to any desired angle to make a bevel-joint.
• noun In printing, a mechanism of iron and steel, designed to cut the ends of metal rules with exact bevels and secure true joints at any angle. This is done in some machines by a saw, in others by a file or chisel.