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EXPANDING COLLETS

5C Expanding Collet 16C Expanding Collet

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16c_exp_col_sm.gif (4362 bytes)

INTERNAL COLLET CHUCKING
ECONOMICAL & ACCURATE !!!

 Features and Benefits:
  • Requires no special adapters
  • Rigid one piece body/mandrel construction
  • Actuated by machine draw tube or collet fixture
  • Available from 1/4" to 6"
  • Available from 1" to 3" expandable length
  • Machinable by customer to desired diameter
  • No draw back gives positive end length
  • Special Collet configurations available
The DUNHAM COLLET provides an expanding member to locate and hold work equipment - lathes, milling machines, grinders, fixtures, etc. - no extra attachments.   Accuracy within .0005 is not unusual on concentricity and the expanding collet enables you to hold close shoulder tolerances.

How Is It Used?

The DUNHAM EXPANDING COLLET is inserted into the spindle of your machine and its threaded draw bar until the 5C or 16C taper seats.  The conventional movement of the draw bar will expand and release the soft slotted member.

The soft mandrel may be machined to fit any I.D. within the range of the collet, i.e. from 1/4" to 6".

The solid taper on the collet, once seated, will not draw back into the spindle.  Thus a machined shoulder will hold the width dimensions within .001".  The DUNHAM EXPANDING COLLET may be removed and replaced in a machine without affecting its accuracy as with any standard collet.  If accuracy to within .0005" is desired, a slight truing cut will suffice.  The collet can operate with the spindle moving.

DUNHAM COLLETS may be transferred to any machine using standard 5C collets.  Therefore, it may be switched from machine to machine for use in turning, grinding, machining, drilling, milling, etc., saving valuable time.

5C & 16C Expanding Collet Sizes and Construction Diagram
Dunham Table of Contents
Master Table of Contents
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