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The history of the bar puller begins with the introduction of the NC/CNC lathes in around 1980. At this time lathes were changed to permit inexpensive and economical production of small or medium-sized batches. The bar puller serves to draw bars into the lathe without operators having to feed the machine with material each time it is required.
Several machine collets (top and centre) and a dismantled pin chuck (below). Generally, a collet chuck, [3] considered as a unit, consists of a tapered receiving sleeve (sometimes integral with the machine spindle), the collet proper (usually made of spring steel) which is inserted into the receiving sleeve, and (often) a cap that screws over the collet, clamping it via another taper.
The collets have a precision bore with axial compression slots for holding cutting tools and are threaded for the drawbar. The R8 system is commonly used with collets ranging in size from 1 ⁄ 8 ″ to 3 ⁄ 4 ″ in diameter or tool holders with the same or slightly larger diameters. The collets or tool holders are placed directly into the ...
The under feeder pushes fresh coal into the bottom of the furnace and then advances it upwards so that it mixes with the burning coal above. The mechanical means used are, depending on design, combinations of the screw feed, the conveyor belt, the bucket chain, the paddle and the ram. Steam jets from the boiler or a mechanical catapult may also ...
A bullbar on a Land Rover Discovery fitted with spotlights and a sand flag. Push bar of a police car in Abu Dhabi, used to move stranded vehicles out of the way. A bullbar or push bumper (also kangaroo bar, roo bar, winch bar or nudge bar in Australia, livestock stop [NB 1] or kangaroo device in Russia, and push bar, ram bar, brush guard, grille guard, cactus pusher, rammer, PIT bar, PIT ...
Pusher centrifugation is also used in the plastic industry, contributing to products such as PVC, polyethylene and polypropylene, and a number of other resins. Individual products Soda Ash—Particle size is commonly beyond 150 μm. Feed slurry usually has 50% solids by weight, and discharged cake has about 4% moisture.
Universal Dividing heads: some manual indexing heads are equipped with a power drive provision. This allows the rotation of the dividing head to be connected to the table feed of the milling machine instead of using a hand crank. A set of change gears is provided to select the ratio between the table feed and rotation.
Old Timers at the Lake Superior Railroad Museum, Duluth, Minnesota. On a mainline locomotive, the cowcatcher has to successfully deflect an obstacle hit at speed. The design principle is to push the object upwards and sideways out of the way and not to lift the locomotive on impact.