This Hardinge 5C regular depth blank emergency step chuck is used to hold large diameter workpieces in a lathe or other machine tool. It has a maximum hole depth of 1/2” (12.70 mm) and an overall length of 4-3/32”. The soft steel face and pilot hole allow drilling, boring, or stepping out to the exact size needed. The step chuck has external right-hand 1.238” x 20 threads for connecting to the draw bar, and the threads are heat treated for long life. The outside diameter of the head is 3/8” larger than the rated size to match the Hardinge 5C step chuck closer (sold separately) so that the full capacity is available to a depth of 1/2”. A step chuck closer for the rated size is required for all rotating spindle applications. This emergency step chuck is used to hold metals, plastics, carbide, graphite, and ceramics in industrial manufacturing applications. Collets are cone-shaped sleeves used to hold rodlike workpieces, or the shafts of tools, in the spindles of lathes, mills, or other machine tools. They are typically made of spring steel with one or more slots along the length to allow expansion and contraction, and have a center hole that is cylindrical, square, or hexagonal. A tapered collar tightens the collet to provide a fast, strong clamping action and accurate centering of the workpiece for low runout, making it ideal for high-volume production of precision parts. An expanding collet is used to hold a part on its inside surface so that it can be machined on its outside surface. A step collet (also called a step chuck) is a collet that steps up to a wider diameter to hold larger workpieces. Emergency collets are machinable to customize the collet so it can hold unusual sizes or shapes for limited part runs. Collets are used in applications such as the manufacture of metal and wood parts, semiconductor fabrication, and crafts, among others. Hardinge Inc. manufactures turning, milling, grinding, and workholding products. The company, founded in 1890, is headquartered in Elmira, NY, and meets International Organization for Standardization (ISO) 9001 standards for quality management.
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