Falcon Precision Industries Uses New Kurt Clamping System |
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Falcon Precision Industries, Inc. specializes in machining complex aerospace components in prototype and low production quantities. To do the needed 5-Axis work on these parts required making special devices for holding the workpiece in a fixed position so the cutting tool could get at pockets, contours and all sides of the part. "We have three Mazak Variaxis 630 machining centers with full 5-Axis machining capabilities and we are awaiting delivery of our fourth one," said John Blankenship, manager of manufacturing engineering for Falcon Precision. "To do the required 5-Axis machining of our aerospace parts on these machines, we designed custom clamping devices to hold these complex parts. We didn't use conventional vises and workholding as the primary holding device because it restricted the machining center to just three axis." That meant setting up the part and running the machine in a three axis mode, stopping to reposition the part and then running the last two axis, defeating the purpose of having 5-Axis capability. That was too slow and tedious so Blankenship and his toolmakers came up with special dedicated holding fixtures to allow for the 5-Axis work. "This was a more productive way to machine in all five axes," he said, "until we discovered Kurt's 5-Axis vise. It gave us a more flexible and faster way to set up and clamp parts for our demanding 5-Axis work." "Scott Lundin, senior manufacturing engineer of Falcon Precision, saw the new Kurt 5-Axis vise at a recent Mazak open house," said Blankenship. "The vise was mounted on one of the pallets of a Variaxis machine. While the vise did not have a part in it, Lundin could easily see several benefits of this type of clamping system. Lundin brought back the literature on the vise, which we reviewed together, saw the benefits and immediately ordered one." Falcon Precision
Targets Complex Aerospace Machining Projects Simultaneous 5-axis machining has numerous benefits, according to Blankenship. "It provides continuous, high speed 5-Axis imaging which is ideal for profiling parts,' he said. "It's perfect for machining deep cavities and corners. Plus it is highly consistent for tighter tolerances while surface finishes are better. And you can accomplish all this in a single machine setup." Falcon Precision machines virtually all materials used for aerospace parts, everything from Inconel and Titanium to various grades of aluminum. Clamping rigidity is of concern for both extremes: smaller parts machined from harder materials and larger parts machined from softer material. Using its custom clamping devices held in standard vises and/or mounted directly on the Mazak Variaxis table which rotates 380¡ (C-axis) and tilts 150¡ (A-axis), Falcon Precision's setup technicians devised appropriate rigidity and clamping pressure basically using set screw devices. As workable as this method was, the addition of the new Kurt 5-Axis vise provided a much faster part setup with more consistent and predictable clamping pressures and the rigidity needed for both small and large parts of both hard and soft metals. This versatility was especially helpful with the low part runs and frequent setups Falcon Precision experienced with its aerospace orders. Kurt 5-Axis
Schenke Clamping System Provides the Ideal Workholding Alternative to Maximize
Mazak Variaxis Output Potential The Kurt 5-axis vise is adjustable to handle any desired clamping width, so it is limited only by the size of the Mazak's machine table. With two clamping jaws, one stationary and one movable, the jaws can be positioned at any desired distance from each other. Actual clamping width for this Kurt system is 0.0787 inch to 9.291 inch (2 mm to 236 mm) that can be extended with optional spindle screws, a clamping depth of 0.315 inch (8 mm), height above the machine table of 6.889 inch (175 mm) with extended height options to 7.874 inch (200 mm) and 8.858 inch (225 mm). A typical job using the new vise runs at up to 12,000 RPM and at 130 inches a minute, depending on the tools used, according to Blankenship. Running time varies from prototypes at 15 minutes to production quantities up to five hours. The system is designed to mount easily on standard T-slot tables, location grid machine tables or custom fixtures. For Falcon Precision, it sets up like a standard vise on the Mazak's tilting rotary table in about the same amount of time: less than 15 minutes. The 5-Axis vise stays mounted on the table with the second pallet used for secondary operations or other projects. The big thing with Falcon Precision's application is that it can handle virtually all of its complex aerospace parts without any add-on jaws, spacers or devices with set screws. New Clamping
System Pays for Itself the First Month Used "We're getting ±.001 inch angularity tolerances running carbide and other standard tool inserts up to 12,000 RPM with cuts up to 130 inches a minute. We've never had a problem with tool chatter or part misalignment at these speeds. The rigidity with this vise has exceeded our expectations, and we're finishing jobs in half the time or less compared to before. The vise paid for itself the first month we used it," said Blankenship. The reason for this rigidity is that the Kurt 5-Axis Schenke clamping system's design eliminates jaw deflection and/or part misalignment during these high speed operations, the company said. By locating the tension spindle directly under the workpiece, the clamping system's jaws do not flare out under tension and the machine table does not distort like conventional workholding. Also, the system handles a full range of workpiece configurations with equal rigidity including blank, machined, round and irregular shapes with repeatable accuracy. "The Kurt 5-axis Schenke clamping system has been an important upgrade for our overall machining operations," said Blankenship. "We've eliminated |
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the need for all of those special clamping devices and we've reduced production time by as much as half with no scrapped parts. And we're finishing jobs in half the time or less compared to before. The vise paid for itself the first month we used it. We've ordered our third Kurt 5-Axis vise and are planning to use the two in tandem for holding even larger parts." In addition to the 5-axis Schenke clamping system, Kurt provides integrated custom engineered workholding systems and custom gaging systems for automated manufacturing. Both workholding and gaging are designed around a customer's requirements with systems available for many industries including automotive, medical and aerospace applications. For more information contact: Kurt Manufacturing Company Industrial Products Division 1325 Quincy Street Northeast Minneapolis, MN 55413 877-226-7823 Fax: 877-226-7828 E-mail: workholding@kurt.com
Falcon Precision, Inc. 1050 North Rand Road Wauconda, IL 60084 847-487-9000 Fax: 847-526-1204 E-mail: jb@falconprecison.com
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