Jaw chuck

A collet is a sleeve with a cylindrical inside and a conical outside. The collet has kerf cuts along its length to allow it to expand and contract. A threaded section at the rear of the collet is used to pull it into a matching conical socket. As the collet is pulled into the socket, the collet will contract - gripping the contents of the inner cylinder. Collets are most commonly found on milling machines, lathes, wood routers, and precision grinders. Collets can also be obtained to fit Morse or Brown and Sharpe taper sockets.

Typically collets offer far higher levels of precision and accuracy than self-centering chucks, and have a far shorter setting up time than independent-jaw chucks. The penalty is that most collets can only accommodate a single size of workpiece. An exception is ER collets which typically have a working range of 1mm. Air cylinders or collet chucks are made to hold cylindrical work, but are available to hold square, hexagonal or octagonal work pieces.

Calisthenics

Weight training develops strength and size of skeletal muscles. It is a type of resistance training and it improves overall health and wellbeing. It increases amount of weight and uses a different types of exercises to target specific muscle groups. Weight training is nothing but anaerobic exercise and it is different from weightlifting, bodybuilding. Calisthenics is consisting of variety of simple movements without using any weights or equipments. Cycling is used to improve fitness and cardiovascular health. Pilates is type of exercise, it encourages the mind to control the muscles. Exercise is based on the core postural muscles it helps to keep the body balanced and providing support for the backbone. Pilates is to prevent backpain.