The Dunham Tool expanding collet is inserted into the spindle
of your machine and it's 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 Tool
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 expanding collet can operate with the spindle
Dunham Tool expanding 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.