miter saws,chopsaw,compoud-miter saw,sliding compound-miter saw,dual compoud-miter saw : FOUR STYLES OF MITER SAWS
On most job sites, a power miter saw is simply called a chopsaw. Here are descriptions of four varieties of chopsaw.
STANDARD CHOPSAW
This saw pivots from a single point with the blade always cutting square to the table. Typically, this saw is used to cut miters across the width of a board by swinging the saw table to the left or to the right. In this case, the face of the board lies flat on the saw table with the edge tight against the fence. A standard chopsaw also can cut a bevel with the board on edge and with one face held against the fence.
COMPOUND-MITER SAW
This saw can cut miters like a standard chopsaw, but the blade and motor assembly also can flop over to one side, allowing you to cut a bevel with the face of the board lying flat on the table. You also can cut a miter and a bevel at the same time—a compound miter—which is used for joining crown molding as well as for framing roofs and cutting stairs.
SLIDING COMPOUND-MITER SAW
This tool can cut miters, bevels and compound miters like a compoundmiter saw. Instead of a fixed pivot point, however, the blade and motor assembly can slide forward and back on a rail. A sliding saw can cut significantly wider stock than a fixedhead saw.
DUAL COMPOUND-MITER SAW
This saw functions exactly like a sliding compound-miter saw, except the blade and motor assembly can flop either to the left or to the right, allowing you to cut bevels and compound miters in either direction. The key advantage here is that you can cut a board with the miter and bevel oriented the same way it will be installed, which can save a lot of head scratching.
From Fine Homebuilding 146, pp. 54-61 