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November 2015

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Mid-Size Diameter Workholding Chucks
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Mid-Size Diameter Workholding Chucks



The mid-size diameter and adaptability to custom fixture designs make the Unilock 138 series BIG Kaiser's best-selling round chuck workholding solution. Now come two new additions to the 138 series - the ESM 138 Turbo and the ERGO 138.

These new versions share the same fundamental body dimensions - diameter, bolt hole pattern, open port orientation, knob type, etc. - making them direct swaps for the original ESM 138. The ESM 138 Turbo and ERGO 138 also have all of Unilock's core features - including quick and easy set-up and loading, self-guided top-side mounting and zero-point clamping.

This improved version of the ESM 138 chuck has a closed back. This gives the chuck turbo capability, which more than doubles the spring-only clamping force, up to roughly 3,520 lbs., by simply connecting an air source to either the 1/8 G turbo port on the O.D. or the underside o-ring port. The sealed back also protects the chuck's piston from contaminants, reducing maintenance while improving consistency.

Another new design feature appearing in the ESM 138 Turbo is slotted pin actuation. The dual-angled slot is designed for faster and stronger transfer of clamping force upon closing, as well as a quicker, even release of the knob.

The ERGO 138 also has a sealed back, protecting the internal mechanics from contamination and making it turbo-capable. In another effort to help maintain clean operations, the back cover has an air blast port, which cleans the knob upon entry. By connecting an air source, operators can clean the chuck and knob before locking it, ensuring firm and consistent positioning during loading/unloading and preserving the equipment. It is ideal for fine-particle materials like cast iron.

The ERGO 138 is 11 mm shorter than the standard ESM 138, featuring a new body height of 28 mm, providing more workable area. Rectangular clamping pins are substituted for standard round pins and now lock the knob with a knee-type lock designed to reduce the chance of slippage. The inner contact ring has been expanded to ø80 mm, offering a larger contact surface area than the ESM 138's ø60 mm. These features add improved characteristics, but do not affect the ability to exchange with original ESM 138 chucks on a 1-for-1 basis.

For more information contact:

BIG Kaiser Precision Tooling Inc.

2600 Huntington Blvd.

Hoffman Estates, IL 60192

888-TOOL-PRO / 847-228-7660

bigkaiser@bigkaiser.com

www.bigkaiser.com

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