October 18, 2019: ER Collets: Duo-Lock Provides Superior Hold for Maximum Precision

ER collets are used in most shops throughout the country, and most of the time they work great. But there are a lot of them in the supply line that may not be of the highest quality. Care must be taken to keep them clean when setting up your tools, check them for hairline fractures, and size them up properly to torque them down to spec. If these steps are not performed correctly, runout, grip and tool life may suffer.

The first step to better performance and shorter cycle times is to know where your ER collets come from. The second is to use an exceptional product. There’s good news on both counts. HAIMER offers a full range of high-performance ER clamping options for milling & turning machines. You’re sure to find one that fits your needs.

Threads Grip Tight
Our Duo-Lock collets in combination with our Duo-Lock cutting tools provide maximum stability and load capacity through a proprietary thread design with a double cone bond. Two contact areas provide additional rigidity and better runout. The double cone plane surface and face cone, along with an additional plane to absorb bending movements, also deliver precise positioning and safe support of machining forces. The results are unmatched accuracy and productivity, with a connection that is virtually unbreakable in the most demanding applications due to optimum force distribution along the whole thread.

Fits All ER Applications
Our Duo-Lock collets are compatible with ER collet chucks ranging from ER 11 to ER 32 with multiple collet length configurations. These ER tapered Duo-Lock collets are perfectly suited for clamping Duo-Lock cutting tools in all established ER collet chucks, driven live tooling and spindles with an ER interface.

All of our Duo-Lock Collets equipped with a HAIMER Duo-Lock cutting tool are guaranteed to have runout accuracy of 5μm or less at the cutting edge and are compatible with all established ER interfaces. Need cooling? The Duo-Lock collet is also available sealed by mono-design for use of tools with internal coolant, or it is available with our “Cool-Jet” feature that provides coolant around the cutting tool (3 or 6 Cool Jet bores).

Speed and Accuracy
The various Duo-Lock cutting tools that screw into the Duo-Lock collet system delivers reduced set-up times resulting in fast tool changes directly in the machine. Three symmetrical flats on the collar allow for easy threading into the locknut. There’s also no need for repeated length adjustments due to the very precise length repeatability of only +/- 10 μm. The tight fit maximizes a carbide tool’s full potential with productivity gains in both roughing and finishing. It also provides high load capacity and rigidity when machining at high metal removal rates. When combined with high-performance cutting tools, Duo-Lock provides more than double the metal removal rate in common milling applications.

There are a wide variety of Duo-Lock cutting tool geometries with standardized cutting edge lengths of 0.75xD, 1.5xD and 3xD. Suitable accessories are available for tool changes in every situation. The Duo-Lock range includes solid carbide, heavy metal or steel extensions, as well as solid carbide blanks for custom tooling.

If you want to learn more about the incredible strength and precision of our ER taper holding technology, contact us to discuss your particular situation.