Collets & Collet Holders

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This article gives a basic overview of the function and uses of collets, how to install them in collet holders, and finally their installation in the Haas CNC mill.

Overview[edit | edit source]

Collets[edit | edit source]

  • A collet is a subtype of chuck that forms a collar around an object to be held and exerts a strong clamping force on the object when it is tightened.
  • Reliable traits of collets include:
    • Fast chucking
    • Self centering
    • Strong clamping
    • Resistance against being jarred loose
    • Precise centering

Collet Blocks[edit | edit source]

  • Collet blocks allow collets to be used in conjunction with machines, specifically lathes or in the vises used with mills. They are a larger hexagonal or square piece of metal, in which the collet is able to slide through and be fastened at the other end.
Square Collet Block
Hexagonal Collet Block
Square Collet Block in Vise
Hexagonal Collet Block in Drill Chuck

Types[edit | edit source]

R8[edit | edit source]

  • R8 collets usually fit into the machine taper itself (i.e. there is no separate chuck). R8 was developed to allow rapid tool changes. R8 collets have a keyway to prevent rotation when fitting or removing. R8 collets are internally threaded.

5C[edit | edit source]

  • 5C collets were developed primarily for work holding. 5C collets have an external thread at the rear for drawing the collet closed, and so work pieces may pass right through the collet and chuck.
R8 Collet
Inside R8 Collet
5C Collet

Collet Holders[edit | edit source]

Mounting Collet in Holder[edit | edit source]

Mill Installation
Step Illustration
Choose appropriate collet size for tool being used IMG 20160524 104447973.jpg
Select appropriate collet holder IMG 20160524 104422398.jpg
*IMPORTANT* Snap the neck onto the collet as shown before placing into collet holder Colletneck.jpeg
Use appropriate tool to tighten neck onto collet holder Toolblock.jpg
Final collet in neck and holder Finalcoll.jpg

Locations in Shop[edit | edit source]

  • 5C collets can be found near the bottom of the cabinet across from Russ's office.
  • R8 collets used in the manual mills can be found underneath the rolling tables next to the mills.
  • R8 collets for use in the CNC mill can be found in the red cabinet near the CNC mill or under the rolling table next to the mill.
5C Collets Location
CNC Collet Sets
R8 Collets (under table next to mills)

QR Code[edit | edit source]