Hardinge Releases New 80mm Quick-Change FlexC™ Vulcanized Collet Systems

March 19, 2013

FlexC_group_8Hardinge Group, the world’s largest manufacturer of spindle tooling, announces the release of the 80mm FlexC™ vulcanized collet system. The collet chucks mount directly to the machine spindle. The 80mm vulcanized collets are inserted and removed with a manual compression wrench for collet changeover in less than ten seconds. That’s 8x faster than it takes to change a collet in a standard collet chuck and 19x faster that it takes to change three jaws on a jaw chuck.
But quick changeover is not the only benefit of this system. The FlexC collet system falls in the “special accuracy” collet classification having guaranteed accuracy within .0004″ (.010mm) TIR for style A (pull-back Dead-length® stationary stop) and .0008″ (.020mm) TIR for style DL (push-to-close). These systems achieve the same gripping capability as conventional collets while using less draw bar force. Additionally, the all too frequent variation in bar stock will no longer be a hindrance. The collet head has a gripping range of ±.020″ (.5mm) of its nominal size to allow for variation in bar stock without having to change the collet. Because there is no collet body, the collet segments will remain parallel to the stock even when there are variations in the bar stock. This parallel clamping insures full bearing contact with the part for optimum holding power and reduced push back.

The Hardinge FlexC collet system is an ideal substitute for 3-jaw chucks because it weighs less, has a lower profile and changes over much faster. Hardinge FlexC collet systems are interchangeable with other brands on the market. Consider the FlexC collet system over other conventional collet adapters to meet special accuracy requirements, or mount it on a chuck-style lathe or rotary indexer for increased versatility. Collets are available in round and hex smooth, round and hex serrated, square smooth, emergency and S-master styles.

For more information contact Hardinge via workholding@hardinge.co.uk or visit http://www.shophardinge.co.uk

Hardinge Supplies a Precision Grip for Medical Component Manufacturing

March 5, 2013

Hardinge, well known in the industry for their SUPER-PRECISION® products, provides gripping solutions for machining small diameter parts for medical component manufacturing. One category of products includes Swiss-type headstock collets, pickoff collets, carbide guide bushings, bar loader collets and custom manufactured solutions for Swiss turning.
Their Swiss-type collets are finish ground to provide a smooth, concentric gripping area (order hole) for the bar stock or work piece and are inspected on a Hardinge SUPER-PRECISION® (.000015” TIR) headstock to assure strict concentricity standards. Hardinge stocks headstock collets, pickoff collets and guide bushings in many styles and sizes. Their standard round guide bushings are carbide-lined to keep the stock clean and unmarked. Hardened steel or Meehanite-lined bushings can be made for certain stock that is not compatible with carbide. Standard extended-nose headstock and emergency collets feature added length (straight or tapered) for doing pickoff work or to compensate for tooling interference. Emergency collets can be machined to the desired bore size right in your shop to accommodate small runs or get you by in a pinch while they ship your desired size collet.


Keeping bar stock unmarked, holding a small diameter on center, holding a thin-wall part, ejecting parts and working with extruded bar shapes are common gripping dilemmas for the Swiss-turning industry. Hardinge has manufactured solutions for all of these problems. They provide special accuracy order holes of .0005” or better for holding strict tolerances, as well as micro-inch finish order holes. They manufacture collets and guide bushings for D-shaped and other extruded shapes, along with pickoff collets with a built-in spring ejector that pushes the part into a basket or conveyor to automate the process. Hardinge has engineered pickoff collets for Citizen, Star, Tornos, Tsugami and other Swiss-type machine applications. Other special Swiss-application collets include stepped, tapered, chamfered, radius & off-center order holes, and over-the-shoulder collets. Additional gripping dilemmas such as short gripping, non-marking, slippery materials, push back, tool clearance, multi-pass machining, large diameters and matched keyways are not a problem for Hardinge.

Hardinge supports most styles and brands of Swiss machines

Medical Manufacturing turns to Hardinge SUPER-PRECISION® Gang-Tool Turning Center

March 5, 2013

Medical part manufacturing continues to be a rapidly growing market due to the large population of aging baby boomers who are looking for “improved quality of life”. Demand is high for high-precision components for neurological, orthopeadic, spinal/bone fixation, dental implants, drug infusion, catheter connectors, optical, maxillofacial, micro/minimally invasive, surgical instruments and other medical devices, most of which can be manufactured on the Hardinge QUEST® SUPER-PRECISION® GT27 gang-tool turning center.
The Hardinge QUEST® SUPER-PRECISION® GT27 gang-tool turning center is designed for machining small diameters, complex and tight tolerance parts, and other challenging requirements. The GT27 offers a continuous machining accuracy of .0002” on diameter, part roundness variation of .000015” and part surface finish of 8 micro-inch, and has proven to be indispensible to some of the best medical manufacturing companies in the world. Bar work up to 1-1/16”/27mm and chucked parts up to 4” in diameter (using a step chuck) can be machined on the GT27 today, with the ability to hold the same accuracy ten years down the road.

The Hardinge GT27 is unlike all competitive gang-tool machines in that it includes their patented interchangeable top plate and their world-renowned, quick-change collet-ready spindle. The top plate secures to the dovetailed cross slide and is interchangeable for quick and accurate tooling changes that can be performed in under a minute. Pre-tooled top plates can be quickly interchanged within .0002” repeatability to produce a new part or family of parts. Hardinge’s patented collet-ready spindle provides maximum rigidity and gripping power because the collet seats directly in the spindle with minimum overhang from the spindle bearings. In this design the spindle accuracy is transferred directly to the workpiece. Additionally, the patented HARCRETE® machine base is 10% stiffer than cast iron, resulting in improved dynamic stability with one-third less vibration at the spindle and a 30% increase in tool life. This provides significantly better part surface finishes than cast iron. Size repeatability, surface finish quality and thermal stability are hallmarks for Hardinge lathes.


The Hardinge GT27 can be used as a stand-alone unit, a higher capacity system with a bar feed, or as a fully automated system with a robot. This machine is an excellent complement to a Swiss machine shop to handle parts that require higher precision. Bar whip or chatter that may be found to some degree in Swiss turning, is not an issue with the GT27 because the bar or chucked part is gripped close to the spindle bearings. For more information call 0116 2869900 or visit http://uk.hardinge.com/index.asp?pageID=64&cID=5

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 workholding@hardinge.co.uk visit www.shophardinge.co.uk

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 workholding@hardinge.co.uk or visit www.shophardinge.co.uk

Hardinge 16C Indexer Special Offer

February 7, 2013

Check out the latest Hardinge 16C Indexer offer available via http://uk.shophardinge.com/product.aspx?partNo=CJ%20100016C


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 www.shophardinge.co.uk