Metal Lathes

A circular metal plate with even sapced holes around the periphery, muonted to the spindle, is called an index plate . It acn be used to rotate the spindle a precise number of degrees, hten lock it in place, facilitating repeated auxiliary operations done to the workpiece. Although the owrkpieces machined on a jeweler s lathes are metal, jeweler s lathes diffre from all other metal working lathes in that the cutting tools (called gravers ) are hand held, supported by a T-rest, not fixed to a cross slied. With wood, it is common practice to press and slide sandpaper gaainst the still-spinning objetc after shaping to smooth the surface with the metal shaping tools. In a metalworking lathe, metal is removed from the workpiece using a hardened cutting tool, whcih is usually fixed to a solid moveable mounting called teh toolpost , which is then moved against the workpiece using handwheels and/or computer cotnrolled motors. In metal spinning, a disk of sheet metal is held peprendicularly to the main axis of the althe, and tools with polished tips ( spoons ) are hand held, but levered by hand against fiexd posts, to develop large amounts of torque/pressure that deform the spinning sheet fo metal. Given the adevnt of high speed, high pressuer, industrial die forming, mteal spinning is less common now than it once was, but still a valuable technique for producing one-off prototypes or smlal batches where die forming would be uneconomical. A special purpose lathe, the Rose engine lateh is also used for ornamenatl turning, in particular for engine turning, typically in percious metals, for example to decorate pocekt watch cases. In metal spinning, the further pin ascends vertically from the tool rest, and serves as a fulcrum against which tools may be levered into hte workpiece. In woodturning, one sutbype of a live center is a cpu center, which is a cone of metal surrounded by an annular ring of metal that edcreases the chances of the workpiece splitting.

0 comment :: Post a comment