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Craftsman No. 5 jack plane A hand plane in use. A hand plane is a tool for shaping wood using muscle power to force the cutting blade over the wood surface. Some rotary power planers are motorized power tools used for the same types of larger tasks, but are unsuitable for fine-scale planing, where a miniature hand plane is used.
A planer is a type of metalworking machine tool that uses linear relative motion between the workpiece and a single-point cutting tool to cut the work piece. [1] A planer is similar to a shaper , but larger, and with workpiece moving, whereas in a shaper the cutting tool moves.
Concerning shaping, the device that holds the piece being worked on has a very heavy movable jaw to withstand cutting forces. The size of the planer needed is determined by the workpiece. Depending on the size of the workpiece many clamps and supporting devices may be used to hold it on the planer.
If an impeller has only a few blades (i.e a large pitch), it will result in less lift force and in a similar manner for more blades (i.e. very low pitch), there will be high drag force. Blade solidity should not be confused with rotor solidity , which is the ratio of the total area of the rotor blades to the swept area of the rotor.
Some portable thickness planers differ slightly in that the table is fixed and the cutter head/feed roller assembly is adjusted. [1]: 1 Industrial thickness planers are capable of accepting very wide boards and removing large amounts of material in a single pass. These machines are driven by powerful motors and are of very heavy construction.
The blades are shaped so that their rotational motion through the fluid causes a pressure difference between the two surfaces of the blade by Bernoulli's principle which exerts force on the fluid. [2] Most marine propellers are screw propellers with helical blades rotating on a propeller shaft with an approximately horizontal axis. [a]