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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 Expanding Mandrels:
Straight Shank Design:
Manually Activated:
Lathes, Grinders, Rotary Tables:
Mount in Jaw Chucks, Vises, Collets, Special Fixtures:
Dunham Expanding Mandrels provide manually activated expanding arbors in a variety of sizes
(please see the Dunham Size Chart below)
to locate and chuck work from the inside diameter of the work piece for operations such as turning, grinding, milling and drilling using existing machine tools and fixtures.
The straight shank of the Dunham Expanding Mandrel is chucked in a collet, jaw chuck, vise or special fixture. The tapered Drawbolt (expansion bolt) is manually rotated with a hex wrench to expand (or release) the work piece. To machine the Dunham Expanding Mandrel for your work piece, the Drawbolt is rotated until the Mandrel expands 0.005", and then the machineable slotted diameter is machined to a diameter 0.001" - 0.002" larger than the bore diameter of the work piece. Complete machining instructions are provided to prepare the Dunham Expanding Mandrel for holding your work piece.
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We manufacture Dunham Expanding Mandrels in 8 standard sizes (please see the Dunham Size Chart below) to accommodate work piece diameters ranging from 5/16" to 6" and work piece lengths up to 2". Please note that the 'milled flat' is no longer required or provided. Again, Dunham Mandrels are designed to be 'finish machined' by the end user on their machine(s), assuring that the Dunham Expanding Mandrel is optimally matched by the customer for maximum concentricity or accuracy relative to the customer's spindle, jaw chuck or other fixture. While 'finish machining' by the end user yields maximum accuracies (and cost savings), Dunham will also machine the Mandrel to the customer's specifications for an additional charge.
Dunham Expanding Collets and Mandrels were originally designed in 1958 by our founder, Russell Dunham, and we were awarded a patent for the designs in 1959.
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Dunham Expanding Mandrel Size Chart Straight Shank Design
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Dunham Expanding Collet Assembly Drawing 5C, 16C, 3J Sizes
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Dunham Expanding Mandrels and Collets are one of a wide range of Dunham workholding and spindle devices: 50M Spindle Headstocks, Cartridge Spindles, Collect Chucks, Collet and Chuck Actuators and Cylinders, Bar Pull Systems, as well as 5C, 16C and 3J 'Plug and Play' Collect 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 Mandrels 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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