The tip of a plane iron or blade is beveled on only one face, and handplanes can be classified based on whether the blade is mounted with the bevel facing up or down. Until recently, bevel-down planes were the rule. Only small block planes were bevel-up. Now, a variety of bench planes have this bevel-up configuration, which makes them more versatile. Here’s why: In a bevel-down plane, the blade (along with a chipbreaker, which attaches to it) rests on a frog—typically, a 45° bed screwed to the plane body. Because the bevel is behind the edge, the cutting angle is fixed at 45°. That’s a good angle for most tasks, but not for end grain or grain prone to tearout.
In a bevel-up plane, the bevel leads into the cut, contributing to the cutting angle. The bed is molded into the plane body at a low angle, usually 12°. So a bevel-up plane with an iron ground to 25° has an effective cutting angle of 37°. However, you can change that angle easily—by changing blades or grinding a new bevel angle on the existing blade.
This versatility makes bevel-up planes especially handy for working a variety of woods and/or grains. You can make the angle low for end grain and softer woods, steep for difficult grain in dense or highly figured woods, or medium for everything else.
All in all, bevel-up planes are more “woodworker friendly.” With fewer parts—no frogs or chipbreakers as on bevel-down planes—they are easier to set up and maintain. Their adjustable throat plates quickly set to the desired mouth opening to support the wood fibers and prevent tearout. (On bevel-down planes, you need to move the frog forward or back to change the mouth opening, a longer and trickier operation.) In short, their ability to work any grain situation makes bevel-up planes more versatile.
A low-angle for end grain. This bevel-up plane is equipped with a blade beveled at 25º on a 12º bed, for a cutting angle of 37º.
Steeper angle for tougher grain. The same plane with a 38º blade provides a 50º cutting angle for this tiger-maple board.
A good angle for general use. The 45º cutting angle of a standard plane makes fast work of surfacing this poplar board.