Multi-spindle rotary indexers optimize spindle utilization and reduce cycle time

February 19, 2013

Hardinge Inc. manufactures single-axis and dual-axis multi-spindle rotary indexers in Elmira, New York. Positioning and machining up to four parts at a time will add efficiency to your machining process by spending more time with the doors closed and the spindle running. The evolution of their 5C indexer began in 1890 with the manufacture of 5C collets. In 1940 Hardinge introduced the 5C threaded-nose spindle and later the 5C dividing head used to index parts. By the 1960’s they manufactured the manual 5C indexer using their threaded-nose spindle and collet closure design. This mechanical design was the benchmark for many 5C indexers produced today, including their own multi-spindle rotary indexers.

Anyone looking to improve small part productivity can take advantage of the many benefits of part positioning and multiple-part processing using a Hardinge rotary indexer. All parts can be machined efficiently with the same tool before going to the next tool. On-center milling, drilling, boring, tapping and reaming applications can be performed on multiple planes of the part. Using a dual-axis rotary indexer gives you the added benefit of machining at multiple angles on the workpiece.

A Hardinge multi-spindle rotary indexer will increase overall production by producing more parts per hour, thus lowering the cost-per-part, while providing a competitive advantage. The unit has a quick ROI with all of these time-saving advantages.

  1. Optimized spindle utilization
  2. Reduced start up – open door, remove/place part, hit cycle start, close door for every 2, 3 or 4 parts instead of just 1
  3. Reduce X- and Z-axis tool movements, drastically decreasing cycle time
  4. Free up the operator to run other machines or perform other tasks
  5. Eliminate the need for additional operations


All Hardinge rotary indexers have a collet-ready spindle providing an assortment of part gripping options. Along with standard collets, Hardinge spindles accept Sure-Grip® expanding collets, step chucks, jaw chucks and face or fixture plates without the use of an adapter. Robust, dual-bearing spindles accommodate heavy axial and radial loads with the ability to run a quad unit with tailstocks. A maximum runout of 0.0002” total indicator reading is the Hardinge standard. Multi-spindle units are available in dual, triple and quad spindle configurations. Hardinge manufactures a wide variety of gear-driven and direct-drive rotary tables and indexers. For more information contact Hardinge via visit


Advantages of the Sure-Grip® Lever-Operated, Counterbalanced Power Chucks

February 12, 2013

Hardinge Inc. manufactures a premiere line of lever-operated, counter-centrifugal and dynamically balanced Sure-Grip® Power Chucks. The lever-operated design of the Hardinge chuck has several advantages over the wedge-type design most commonly found on low cost, non-counterbalanced chucks that are supplied with the initial purchase of many chuck-style lathes.

In the Hardinge lever-operated system, the drawtube is connected to the jaws through a pivoting lever that is mounted on pins inside the chuck body. The lever system has reduced friction and increased mechanical advantage compared to a wedge-operated chuck for a given draw bar pressure. In other words, a lever will always have greater actual gripping power at the jaws than a wedge-operated chuck, for any given draw bar pressure.

The lever system also has reduced internal bearing surface over the wedge-operated closure, making it less sensitive to lack of lubrication. The greater efficiency of the design results in reduced wear on the operating cylinder, dramatically increasing component life. For this reason, a lever-operated chuck system (chuck and operating cylinder) will usually have a longer life than that of a wedge-operated system.

In the Hardinge counterbalanced chuck design, weights are incorporated into the actuating levers of the chucks at the opposite end of the fulcrum or pivot-point of the jaws. Centrifugal force acts upon this weight just as it does on the top jaws.  However, since the weight is at the opposite side of the lever from the top jaws, the upward thrust generated counteracts some of the jaw force loss. Thus, the counterbalanced lever design has substantially more gripping force at high RPM than that of a non-counterbalanced style.


The major advantage of the Sure-Grip power chuck is the configuration of the drawtube that actuates the chuck. Since Hardinge machines all have collet spindles that do not require a collet chuck or adaptor, it is a simple matter to remove the collet and quickly mount the 3-jaw Sure-Grip power chuck when needed. The chuck’s drawtube threads directly into the machine’s draw bar, just as a collet would. This changeover can be accomplished in ten minutes or less. Other designs can take hours. The Sure-Grip power chuck is also available for non-Hardinge lathes that do not have collet style spindles.

Hardinge manufactures its chuck components to high accuracy and repeatability standards. The repeatability of a chuck is the measure of its ability to repeat the performance, either from job-to-job or from part-to-part. Most models of Hardinge® Sure-Grip power chucks have an accuracy (T.I.R.) of .0005 inch and repeatability of .0005 inch, making them ideal for close tolerance turning requirements. Hardinge Sure-Grip power chucks are competitively priced, while demonstrating distinct advantages over the wedge style chuck. For more information contact Hardinge via or visit

Hardinge 16C Indexer Special Offer

February 7, 2013

Check out the latest Hardinge 16C Indexer offer available via


Hardinge supports pharmaceutical market with Capsule Collets

February 5, 2013

Hardinge, a global designer and manufacturer of machine tools and advanced workholding products, has been producing capsule collets for the world’s leading capsule manufacturers for the past 50 years. These partnerships have resulted in state-of-the-art collets for the production of capsule bodies and caps in sizes of #00, 0, 1, 2, 3, 4 and 5. Hardinge precision, hardened and ground collets assure reliability and long life for the medical and pharmaceutical industries. A polished radius nose on the collet reduces friction and eliminates marking, while allowing you to take full advantage of your production capabilities with reduced downtime. Collets are 4-split or 3-split, depending on size, and are stocked in their Elmira, New York facility for worldwide distribution. Hardinge also designs and manufactures custom gripping devices for turning, milling, grinding, process and assembly applications.

Capsule collets and over 40,000 other workholding and rotary products are available from Hardinge at