When multitask, or mill/turn, machines started to become more popular around 2000, Coromant Capto made inroads into that machining segment. “The main reason Coromant Capto was designed was to have a system that was equally at home for turning, milling and drilling,” Mills said. Within the quick-change category, Coromant Capto and the Kennametal KM system each have 43 percent shares in the U.S., according to Mills.īut the Coromant Capto coupling system isn’t only suitable for turning. Quick-change tools comprise the rest but are increasing in use. “When you set tools offline, for example, you can literally change a tool and be cutting again within 30 seconds.”Īccording to Sandvik Coromant, conventional tools, such as stick tools, represent about 87 percent of the global market for turning centers. “It takes a quarter turn of a wrench to clamp and unclamp the cutting heads,” said Brent Godfrey, Sandvik Coromant’s product specialist for tooling systems. The Coromant Capto coupling was initially accepted in lathes because of its ability to enable quick tool changes-Sandvik Coromant says up to five to 10 times faster than conventional tools-with camshaft-style clamping. flange with a larger polygon than the C8, will be introduced March 1. The one version is currently available in six sizes: C3 (32mm-dia. “There is one version only,” Tester said, “not versions A to T, like HSK.” And with Coromant Capto, multiple versions are not an issue. In addition to having three sides, the hollow polygon has a 1:20, or 1.4°, taper. “The products were selected to offer the most popular Rego-Fix products for multitasking machines with a Capto interface,” said Peter Tester, president and CEO of Rego-Fix AG, Tenniken, Switzerland.Ī Coromant Capto toolholder with the PowRgrip collet from Rego-Fix. Rego-Fix offers monoblock Coromant Capto toolholders with ER and powRgrip collet systems. “Because it has a polygon shape, a Capto toolholder couldn’t turn inside a spindle, so the whole transferrable torque of the spindle is on the entire taper of the Capto holder.” Weber, president of Rego-Fix Tool Corp., Indianapolis. “A CAT or BT holder has keyways at the flange that transmits torque,” said Andreas S. The polygon also provides torque transmission from the machine tool spindle to the cutting tool without the need for keyways. The polygon taper ensures automatic radial centering and even pressure around the coupling, according to Sandvik Coromant, enabling repeatability within 2μm. “I found the three-sided polygon provided superior stability.” “Why does a modular system have to be circular?” Andersson asked. The Coromant Capto’s three-corner polygon shape distinguishes it from other toolholders. We drove this certification to make sure no one could change the design, and that’s what ISO certification achieves.” “We wanted to ensure that if anyone makes it, and anyone is more than welcome to make it, all the tolerances are exactly the same as the original. “When the patent ran out, we didn’t want people to make a lower-quality version so that it started to create problems for those who had Coromant Capto,” said Chris Mills, national portfolio manager for Sandvik Coromant, Fair Lawn, N.J. Sandvik Coromant’s Coromant Capto machine adapted clamping units (MACU) for lathes are suitable for turning and milling applications. ISO certification means no manufacturer can sell a Coromant Capto holder that doesn’t conform to the standard’s specifications. Since then, Coromant Capto has made industry inroads via sales by Sandvik Coromant and its various licensees and was adopted in 2008 as an ISO standard (26623) for toolholding systems when the company’s patent expired and the need to license it ceased. Sandvik Coromant completed the first prototype in 1989 and unveiled the full version at IMTS 1990 in Chicago. Ken Andersson, who has since retired from the toolmaker and now builds boats, invented Coromant Capto. For the Coromant Capto toolholding system developed by Sandvik Coromant Co., modularity, universality and repeatability define it. Those are definitions of the Latin word capto. A look at the Coromant Capto modular toolholding system.
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