Mortice chain No. 910, 0"89 pitch, 1/4" wide, 32 links long, with guide bar and 4.T. sprocket wheel, type A

The chain cutter used in a wood mortising machine, produces a finished mortise of exact size rapidly and in one cut.

The chain is built up of a number of hardened tool-steel link plates connected together by rivets which are countersunk into the outer plates. A cutting tooth, having the proper cutting angle and clearance, projects from one edge of each plate. The smaller chains have alternately one and two plates in each link while the larger sizes have two and three, the thickness of the plates varying according to the total width of mortise required. The guide bar is also of hardened steel and has a ridge on each edge to guide the chain, while a roller bearing wheel at the lower end received the working thrust. Its upper end is bolted to the slide of the machine, and above it is mounted the driving sprocket.