Collet-ready Rotary Tables

If you've been using fixtures to grip parts on your rotary device, you already know how much operator intervention is required for setting up, clamping and locating the part, and changing from one job to another. And let's not forget about the design time and machining involved to produce the fixture itself. All of this accumulated time lengthens the production time and increases the cost of the part. Are there any other alternatives? Yes, collet-ready spindle rotary tables and indexers, manufactured by Hardinge accept a wide variety of standard tooling to grip parts of various shapes and sizes so that you can output more parts per hour at a lower cost per part.

But part cost isn't the only advantage of using a collet-ready rotary unit. Part quality is a factor and it begins at the spindle. Parts machined closest to the spindle bearings provide the highest accuracy with less wear on the rotary device. A hardened collet, step chuck or expanding collet will seat directly in the Hardinge spindle with the machining process closest to the spindle. Minimal overhang from the spindle bearings assure that spindle accuracy is transferred directly to the part being machined. Fixtures that are not hardened will lose positioning accuracy over time. Fixtures add weight to the spindle and move the cutting location further away from the spindle bearings.

Hardinge collet-ready turning centers, build the same A2 spindles into their rotary tables and indexers for increased precision and the convenience of quick setup and changeover with no adapter required. Collet-ready spindles will accept collets, step chucks, Sure-Grip expanding collets, FlexC quick-change vulcanized collet systems, custom collets, manual chucks and Sure-Grip power chucks. This tooling can be shared with a CNC lathe that you may already have in your shop. Collets and chucks will provide automatic centering of the part whether it is round, hexagon or square and will use less storage space than custom-made fixtures. If you'd like to continue using some of your existing fixturing, a simple adapter may be used.

Refer to the capacity chart provided for all of the gripping opportunities provided by a Hardinge collet-ready spindle rotary device. You can eliminate and replace heavy fixturing with higher precision, less expensive workholding products. Your premachined part could be gripped on a threaded or tapered outside diameter; an internal diameter; a square; a hex or any custom shape; or over a shoulder. Rough or slippery stock, thin wall and out-of-round parts, short grips, recessed grips and off-center parts are no problem. Castings, moldings, stampings and machined parts are held rigidly and accurately, while tubing can be held without crushing or distorting.

Collets will seat directly in the spindle for maximum gripping power and rigidity, providing the most accurate positioning available. Step chucks are simply oversized collets with a stepped-out face to grip larger part sizes using a closer. Step chucks provide extra grip force for short grip parts because the collet is closed against an opposing taper with 360-degree contact. Step chucks can have more than one gripping diameter for end-to-end machining or multiple use. Hardinge Sure-Grip Expanding Collets are used to grip the internal diameter of parts ranging from ¹⁄₈ inch up to 4 inches. Hardinge quick-change FlexC Collet Systems have an accuracy of within .0004" (.01mm). FlexC collets (42 and 65mm) are ideal for job shops that frequently change setups throughout the day because the collet heads change out in seconds. S-master style FlexC collets are available in 65 millimeter for shops that predominantly use S-pads with their other machines. Four-Jaw manual chucks will grip round, hex and square parts.

The Hardinge Sure-Grip 3-Jaw Power Chuck mounts directly on the rotary spindle to grip larger diameters and offers the best grip strength on the market. 3-Jaw chucks will grip round and hex shapes. Hardinge slotted face plates are precision ground for accurate locating of odd-shaped parts with guaranteed perpendicularity to the centerline of the spindle.