Linear is a straight movement and rotary is a circular movement. Think of in an engine - the piston moving up and down is linear motion, and the crankshaft turns it into rotary motion.
A rotary compressor is like a car engine, with pistons, rods, sleeves, valves, etc. A screw compressor has two screw type rotating parts that squeeze the refrigerant as the screw threads get tighter...
The hammer drill vibrates in and out very fast to make masonry drilling much easier.Rotary hammers are drills with a piston on the inside which is operated by the motor and gears. When the motor...