Description
Dog Chuck For Lathe. BANKA provides a comprehensive range of dog Chuck and much more as per Indian. standard.
Spiders can serve various purposes:
- As auxiliary features Dog Chuck complement the main lathe chuck:
- To hold the bar or workpiece at the back end of the spindle bore and support it concentrically, so that it resists wobbling or whipping while the spindle is turning. Gun barrels and oil pipes are examples of workpieces that benefit.
- To hold the bar or workpiece at the tailstock end (thus serving as a steady rest) or follow the tool (thus serving as a follower rest).
- In place of the main lathe chuck (for particular workpieces that can benefit—for example, in some gunsmithing work)
- On an independent-jaw chuck, each jaw can be moved independently. Because they most often have four jaws, the term four-jaw chuck without other qualifications is understood by machinists to mean a chuck with four independent jaws. The independence of the jaws makes these chucks ideal for (a) gripping non-circular cross sections and (b) gripping circular cross-sections with extreme precision (when the last few hundredths of a millimeter [or thousandths of an inch] of runout must be manually eliminated). The non-self-centering action of the independent jaws makes centering highly controllable (for an experienced user), but at the expense of speed and ease. Four-jaw chucks are almost never used for tool holding. Four-jaw chucks can be found on lathes and indexing heads.
- Self-centering chucks with four jaws also can be obtained. Although these are often said to suffer from two disadvantages: inability to hold hex stock, and poor gripping on stock which is oval, only the latter is true. Even with three-jaw self-centering chucks, work which is not of the uniform section along with the work (and which is not free of spiral or ‘wind’)should not be gripped, as the jaws can be strained and the accuracy permanently impaired.
- Four-jaw chucks can easily hold a workpiece eccentrically if eccentric features need to be machined.
