Found in almost every pro shop, the mortising machine is also a great time-saver for hobbyist woodworkers. Tim Albers tried out several different types to see which ones deliver on the promise of producing an accurate mortise in a minute or two. Which type is best? It depends on your budget and whether you want a machine that can make more than just mortises. Hollow-chisel mortisers are straightforward, producing an accurate square hole, and they come in different sizes and categories. Horizontal slot mortisers are pricier, and the more complex joint-making machines are pricier still.

From Fine Woodworking #206