فشنگی اسپیندل ER11 قطر 6 میلی متر

A collet is a subtype of chuck that forms a collar around an object to be held and exerts a strong clamping force on the object when it is tightened, usually by means of a tapered outer collar. It may be used to hold a workpiece or a tool.

An external collet is a sleeve with a (normally) cylindrical inner surface and a conical outer surface. The collet can be squeezed against a matching taper such that its inner surface contracts to a slightly smaller diameter, squeezing the tool or workpiece to hold it securely. Most often this is achieved with a spring collet, made of spring steel, with one or more kerf cuts along its length to allow it to expand and contract. An alternative collet design is one that has several tapered steel blocks (essentially tapered gauge blocks) held in circular position (like the points of a star, or indeed the jaws of a jawed chuck) by a flexible binding medium (typically synthetic or natural rubber). Regardless of the collet design, the operating principle is the same: squeeze the collet against the tool or workpiece to be held, resulting in high static friction and accurate alignment.

ER type collets are widely used in Europe. The design featuring an 8°/30° double taper and 16 slits provides high concentricity and a firm grip.

Collets have a chucking allowance of 1 mm, adding a higher degree of freedom in chucking.

The collet series lineup is extensive and ranges from the ER11 with a chucking range of 0.5 to 7.0 mm to the ER40 with a chucking range of 3.0 to 26.0 mm.

Generally, a collet chuck, 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.

An internal collet can be used to lock two telescoping tubes together. In this case, the collet is in the form of a truncated cone drilled and threaded down the centreline. The collet diameter matches the bore of the inner tube, having the larger end slightly greater than the bore while the smaller diameter is slightly less than the bore. A threaded stud, anchored at its other end to the tube, is then used to pull the collet into the tube. The increasing diameter of the collet forces the inner tube to expand and be pushed against the inner wall of the outer tube thus locking the two tubes together. The inner tube is often slotted to facilitate this expansion.

Lathe machine

Type: ER11A-6mm

Material: Steel

Height: 40mm

Shaft Diameter: 16mm

Shaft Inner Diameter: 6mm(±0.02mm)

Nut Diameter: 19mm

Nut Inner Diameter: 9mm