Mortice & tenon joints are the single most common joint used in woodworking due to their structural integrity & simplicity, but cutting accurate mortices by hand is a laborious & tricky job. This machine makes accurate & repeated cutting of mortices easy. A hollow square chisel with bit (not supplied) is driven into the timber to produce clean sided square holes. The width of the hole is affected by the size of chisel & bit chosen & if it needs to be bigger than the maximum chisel size the table can slide forward or backwards by simple handwheel adjustment for another series of perfectly parallel cuts to be made, the depth is set on the machine with simple stops for repeatable accuracy. The length of the mortice is increased by moving the table laterally, also on a simple slide operated with a separate handwheel. The head driving the chisel is easily lowered toward the timber with a large handle assisted by rack & pinion & returns to the starting position with the aid of a gas strut. Construction is of heavy cast iron with machined dovetail slides & gib strips for easy adjustment