Tag Archives: QJC chuck

  • 5 Applications Where Quick Jaw Change Chucks Shine

    Screen Shot 2017-03-20 at 3.13.05 PMWe previously examined the 5 technical advantages of the SMW Autoblok Quick Jaw Change (QJC) chuck feature – time, accuracy, longevity, reduced hysteresis, and value. But what do these advantages mean on the shop floor? Here are just a few applications in which the QJC design can make a big difference in speed, time and profit.

    Fast Turnaround (JIT)
    The idea behind “Just in Time” logistics is to inventory only the parts required for a certain period of time. In an ideal situation, the truck pulls into the loading dock with replacement components just as the parts bin empties. This gives manufacturers flexibility as they can order parts based on market demands. However, sometimes someone miscalculates, resulting in a rush order. Since QJC chucks don’t have to be re-machined or qualified, the proper chuck for the run can be put into operation in minutes.

    Short Runs
    In a similar fashion, job shops that run a large number of short runs continuously throughout the day for the off road or agricultural markets can benefit from the fast set up and flexibility offered by the QJC feature. With an inventory of chucks set up for a particular part (or family of parts), changeovers between each job are kept to a minimum. Since no additional machining or set up is required, small runs of parts for a variety of customers are turned out in rapid order.

    Thin-Walled Components
    When chucks run at high rpms in a CNC lathe, centrifugal force actually causes them to grow (hysteresis). Components that have thin walls or require a delicate touch can actually be deformed due to these additional clamping forces. Customers can run delicate parts at higher rpms with the QJC feature because the design resists hysteresis and maintains its shape. Pressure on the part remains constant from the beginning of the run to the end.

    High/Low Clamping
    Parts like those found in the automotive industry require a lot of metal to be removed initially, but need a fine finish that requires a more delicate touch. QJC chucks are perfect for this application since the clamping pressure can be changed without unclamping the chuck. A standard chuck has to be broken open and reseated before proceeding to the finishing run. This not only takes time, but creates the danger of chips and other contaminants slipping between the chuck jaws and the parts. A software code used with the QJC feature stops the spindle and shifts the hydraulics to a lower pressure without unclamping, speeding up the process and eliminating the risk of introducing foreign material into the machining process.

    Precision Components
    The hardened steel and design of QJC chucks provides outstanding concentricity, repeatability and rigidity. This built-in accuracy makes it perfect for any job where the margin for error is small. Even when changing from one part to another, operators can be confident that the combination of a good CNC machine and QJC chucks will rapidly turn out high quality parts with minimal contributions to the scrap bin.

    Contact us if any of the above applications sounds familiar. We can find the right Quick Jaw Change to fit your application.

  • 5 Technical Advantages of SMW Autoblok Quick Jaw Change Chucks

    Screen Shot 2017-02-20 at 10.17.49 AMWhen an expensive CNC machine is down for setup, productivity drops, along with a shop’s bottom line. For this reason, Quick Jaw Change (QJC) chucks were developed by SMW Autoblok engineers. The main reason for the new design was to reduce down time during job changeovers. It was soon discovered that the technology provided many other benefits as well.

    With standard chucks, the operator typically bores a set of jaws right onto the master jaw. Removing the jaws requires the removal of six bolts (which can be lost or dropped into the chip pan). With QJC chucks, the master jaw, top jaw and bolts are a sub-assembly that can all be simply removed together with a t-handle wrench on the side of the chuck. It’s faster, but that is only the beginning. In this article, we review the top five technical advantages QJC chucks provide in the shop.

    The QJC removal procedure alone allows for faster changeover of the jaws and speeds up production. However, jaws on standard chucks are also made of softer steel than QJC chucks. To maintain tolerances, they have to be re-machined every time they are removed from the machine.

    Just in Time (JIT) parts ordering forces manufacturers to run small batch sizes. More changeovers mean more time for set up and re-machining the tooling. Depending on the expertise of the operator, this could take up to 15 minutes for a smaller chuck. If you change four times a shift, that’s an hour lost from production time. Made of harder steel, QJC chucks have far superior repeatability. Since they don’t have to be re-machined, changeover time is reduced down to one to two minutes (only 4-8 minutes per shift).

    The accuracy of a brand new standard chuck might be adequate, but as the soft body starts to wear, the metal starts burnishing and removing itself and the workpiece quality suffers. The hardened steel of the QJC chuck changes the picture dramatically. A 260mm chuck is repeatable within 26 microns. To put that into perspective, a human hair is 75 microns thick. Quick jaw change chucks can maintain these tolerances for over a decade.

    The steel body of a standard chuck is so soft it can easily be marked with a file. When the master jaw and the chuck body of a standard chuck are actuated, they rub together. If not greased properly, the surfaces end up wearing. This wear can be increased by over clamping. Standard chucks can last up to three years if well maintained, while the hardened body and master jaw of the QJC chucks allow them to stay in service for ten years or longer.

    Reduced Hysteresis
    When chucks run at high RPMs in a CNC lathe, centrifugal force actually causes them to grow. This is called, “hysteresis.” You can’t see it with the naked eye, but the mass of a soft-bodied chuck microscopically enlarges enough to actually clamp the part harder at the end of the job than at the beginning. Thin-walled parts can be deformed due to the additional clamping force. Customers can run delicate parts at higher RPMs with the QJC because the design resists hysteresis and maintains its shape.

    Some parts companies have higher margins (and do better business) with replacement chucks than they do with the initial sale. They sell in bulk to machine tool companies for installation on standard units. Margins are so low, the vendors are basically betting that they will reap the benefits when the jaws have to be replaced. With all the advantages outlined above, the QJC provides much better value for just a little more investment up front.

    With over 25 chucks in our SMW Autoblok lineup with the Quick Jaw Change feature, there is sure to be a solution that meets your needs. Contact us to find that solution today.

  • KNCS-2G Quick Jaw Change Chuck

    KNCS-2GSealed, clamped, and ready to turn—the next generation of quick jaw change chucks has arrived. The newest addition to the series, the KNCS-2G, offers the same superior flexibility, minimal set up times, and high repeatability as the original KNCS-N, but with added protection and efficiency, making it ideal for mass production applications.

    With its optimized lubrication system, the KNCS-2G will save you time and money in repairs and upkeep. The original KNCS-N needed lubrication every shift, but the 2G’s optimized jaw guide ways make lubrication necessary only every third shift. Additional channels and grease pockets in the jaw guide ways help the chuck operate for longer, while seals in the chuck body and base jaws of the KNCS-2G provide an extra defense against dust and debris.

    The chamfered guide ways of the KNCS-2G allow you to quickly switch out jaws, making it extremely flexible for operations needing multiple jaw changes. The ability to interchange with the standard KNCS-N offers added flexibility by allowing existing master jaws to be used without sealing. These features, in combination with a low loss of grip force due to centrifugal force, make this chuck perfect for high-speed applications. With minimum set up times and maximum cost-efficiency, the KNCS-2G is the most flexible production chuck in the world.

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