dead length collet chuck

A dead length collet chuck, also known as an Accu-Length™ or true length chuck, is a type of collet chuck that minimizes or eliminates axial movement of the workpiece during the clamping process. This means the workpiece does not shift forward or backward when the collet is engaged, ensuring consistent positioning and length in the Z-axis.

Here's a more detailed explanation:

  • How it works: In a dead length collet chuck, the collet is fixed to the chuck body, and a tapered sleeve pushes forward to compress the collet and grip the workpiece. Unlike pullback-style chucks, where the collet moves axially with the draw tube, the workpiece remains stationary in the Z-axis.
  • Benefits:
    • Precise positioning: Ensures the workpiece is held at the same axial position every time, which is crucial for accurate machining and repeatability.
    • Reduced part movement: Eliminates or minimizes any axial movement of the workpiece during clamping, preventing inaccuracies and potential damage.
    • Suitable for second operations: Ideal for second operations where maintaining consistent part length is essential.
  • Applications: Dead length collet chucks are commonly used in CNC lathes, multi-spindle machines, and other applications where precision and repeatability are critical. They are suitable for both first and second operations.
  • Cost: Dead length chucks are generally more expensive than pullback style chucks.
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