Collet adapters can improve part precision and reduce setup time

January 29, 2013

Hardinge® HCAC® Collet Adaptation Chucks will adapt most spindles to accept C-series pull back collets, J-series pull back collets, stationary B-series collets, style-S master collets, step chucks & closers and dead-length® collets. It is possible to increase your machining capabilities by substituting a collet chuck over a jaw chuck for part diameters up to 6 inch depending on the spindle size.

The benefits of using collet chucks in place of jaw chucks include:Collet Adapters

• Lighter weight, no hoist required to mount on spindle

• Faster job setup time

• Faster acceleration and deceleration due to less weight and smaller diameter

• Higher spindle speeds for reduced cycle times

• Optimum gripping with higher precision capability

• Capable of using master collets and pads

• Improved part concentricity over jaw chucks

• Eliminate time spent on boring jaws

• No hazard of jaws flying off

Another style of Hardinge collet adapter is their quick-change FlexC™ Vulcanized Collet System that provides collet changeover in seconds using a manual compression wrench. The FlexC collet system has a guaranteed accuracy within .0004″ (.010mm) TIR for both collet system styles A (pull-back stationary stop) and D (pull-back thru-hole) and .0008″ (.020mm) TIR for style DL (push-to-close dead-length®). The collet head has a generous gripping range to allow 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 minimizes stock “push back” that could create inconsistent part lengths. The spindle mount will fit on A2-5, A2-6, A2-8 and some flat back spindles (main and sub).

Collet Adapters and over 40,000 other workholding and rotary products are available from


April 11, 2012

Hardinge Collets

March 13, 2012

Did you know that Hardinge is the world’s largest manufacturer of collets, feed fingers and pads? We provide spindle tooling for turning, milling, grinding, high-production and assembly applications. Hardinge also manufactures cnc lathes, VMC’s and rotary tables and indexers with collet-ready spindles to accept collets, step chucks, expanding collets and jaw chucks without the use of an adapter!

For more information call 0116 2869900, or visit

Automatic Tool Probe Systems

March 7, 2012

Tool probes on machines are popular option to allow quick setting of the tool offsets to reduce setup time. If the machine is equipped with an automatic style tool probe there are additional features that can often be utilized. For example if an application calls for redundant tools for use with the tool life management feature, once all the tool lives have been expended though the course of the machining cycle, the operator would change all the tools and using a prewritten program use the automatic tool probe to automatically reconfirm all the tool offsets by cycling the program using the automatic mode. This could reduce the time from manually using the tool touch probe. Another often overlooked area for possible use is for broken tool detection. The automatic tool probe can very easily be written into a machining program to determine whether a cutting tool has been damaged, such as a drill or tap, and the machine cycle would then stop if the tool is found to be outside its preset limits.

Lathes & Sub Spindles – Options To Be Considered

March 1, 2012

Today’s mid and high performance cnc lathes are often times ordered with a second or sub spindle option to help increase productivity by eliminating secondary machining operations. In order to get the most productivity from this type of machine option there are a number of additional options that should be considered. These options will increase production uptime, while minimizing the potential for machine damage.

Key options to consider:

  1. Parts Ejection
  2. Part Present Detection
  3. Thru Sub Spindle Coolant
  4. Sub Spindle Air blast
  5. Barfeeder

Sub spindle options are becoming more prevalent in today’s marketplace for lathes. All the above features should be considered when investigating a sub spindle option for a particular project. Additionally whenever the thru spindle coolant or air blast features are used, it may be beneficial to rotate the spindle at a slow (50rpm) speed while activating the option, to help allow the chips to evacuate better.

Synchronized Spindle Transfer

February 28, 2012

Synchronization is required for spindle transfer of odd-shaped parts including hex and square stock and for round parts using live tooling on the main and sub-spindles. Without synchronized collets extra programming and cycle time are required to line up the workpiece to properly transfer the part from one spindle to the other.

In most cases (draw-in style collets) a keyway is used to align the collets when inserting it into the spindle. Synchronized collets orient the part to a specified point on the workpiece. Hex and square collets are synchronized to the center of the flat or the corner. Hardinge will provide a high tolerance of within 15′ or ¼°. Still greater tolerance can be achieved when required. Collets for specific machines such as Acme Gridley, Hydromat and other multi-spindle lathes that already have a keyway can be synchronized to the customer’s specifications.

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Multiple part processing with Plate and Cube Rotary Trunnions

February 23, 2012

Equals 4th-axis multi-part production for reduced manufacturing cost.

Plate and cube trunnions are add-on accessories for rotary tables or indexers that will allow multiple part positioning in a tilting, dual-axis set up. The plate has a machineable area on two surfaces with an adjustable centerline to accommodate various part heights. The cube is a solid aluminum block. One end of the plate or cube is supported with a bearing pillow block, while the other end mounts in or on the spindle of the rotary table or indexer. Read More

Click here for Hardinge Rotary Brochure