Since 1958,
Dunham Tool has designed and manufactured innovative, high quality and high accuracy workholding, toolholding and spindle solutions for manufacturing industries worldwide.
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Dunham Tool Expanding Collets:
5C, 16C, 3J Systems:
Lathes, Rotary Tables, Grinders, Special Machines: (Special Collet Sizes Available) |
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Dunham Tool's Expanding Collets are designed for holding workpieces on their inside diameters for a variety of operations on Lathes, Cyndrical Grinders, Polishing Machines and many Special Machining, Laser Joining and Assembly Machines. Please see below for Dunham CAD Layout and Assembly Drawings detailing the complete range of Dunham 5C, 16C and 3J Expanding Collets.
Dunham Collets are designed for use with all standard 5C, 16C and 3J Collet Chucks, Spindles, etc.
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| | Dunham 3J Expanding Collet |
By design, Dunham Expanding Collets are a 'true length' or 'dead length' workholding tool because the Collet's male taper remains fixed on the Collet Chuck's female taper which permits exceptionally accurate and repeatable control of the workpiece location.
We manufacture Dunham Expanding Collets in 29 standard sizes to accomodate workpiece diameters ranging from 1/4" to 6" and workpiece lengths up to 3". Dunham Collets are designed to be 'finish machined' by the end user on their machine(s), assuring that the Dunham Expanding Collet is optimally matched (TIR) for maximum concentricity relative to the end user's spindle. While 'finish machining' by the end user yields maximum accuracies (and cost savings), Dunham will also machine the collet to the customer's specifications.
Dunham Expanding Collets were originally designed in 1958 by our founder, Russell Dunham and we were awarded a patent for his design in 1959.
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| | Dunham Expanding Collet Size Chart |
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| | Dunham Expanding Collet Assembly Drawing |
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Dunham Expanding Mandrel Size Chart
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Dunham Expanding Collets are one of a wide range of Dunham workholding and spindle devices: 50M Spindle Headstocks, Collet Chucks, Collet and Chuck Actuators and Cylinders, Machinable Expanding Mandrels, Expanding Collets, Bar Puller Systems, as well as 5C, 16C and 3J 'Plug and Play' Collet Chucking Systems for all Lathes, Rotary Tables, Grinding Machines and Special Machines, Thru Hole and No Thru Hole Kits available.
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 | | Dunham Bar Pull System: 1/8"-3" Bar Stock Applications |
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 | | Dunham Expanding Collet; 5C, 16C, 3J |
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Dunham 50M Spindle Headstock; 5C, 2J
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 | | Dunham Collet Chuck; 5C, 16C, 3J |
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 | | Dunham Air Collet Closer; 5C, 16C, 3J |
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Dunham Cartridge Spindle Headstock;5C, 16C, 3J
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Dunham Cartridge Spindle Assembly; 5C, 16C, 3J
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The Dunham Expanding Collets
are one of a wide range of Dunham workholding and spindle solutions:
50M Precision Spindles:
5C, 16C, 3J Cartridge Spindles:
Collet/Chuck Actuators/Cylinders: 5C, 16C, 3J Expanding Collets:
Bar Pull Systems:
1/8" to 3" Bar Stock Applications
5C, 16C, and 3J
'Plug and Play'
Collet Chucking Systems for all Lathes, Rotary Tables, Grinding Machines and Special Machines:
Thru Hole and
No Thru Hole Kits available:
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