b'Engineer Yannick Groll. In it, therectlytothemachinewithoutbe used for optimal results. In some two state that a pretuned vibrationintermediaryextensionsorre- cases, an increased feed rate may damper consisting of a heavy-metalductions and that a dual-contactbe needed to trigger the devices mass suspended inside the tool- mounting system, such as Capto,damping effect.CTESeco Tools One shot one hole Seco Tools Steadyline dynamic-vibration- up to 20 x d in challenging materialscontrol tooling reportedly damps the harmonics that produce chatter, allowing a tool to be run at a higher feed rate. cool drillingholder bar enables long-overhang operations to be performed at least twice as fast as those using non-damped toolholders, with better part finish and tool life to boot.In one example, Seco engineersEASY DRILLING INtested the effectiveness of dynamic-Stainless steels vibration-control toolholders when Superalloys and CrCo-alloysside milling. Using one of the com- MAXIMUM PERFORMANCE panysnondampedCombimas-ter holders, they machined CK50 Decreased machining time high-carbon steel with a 0.787"-dia. Increased tool life(20mm) endmill spinning at about Process reliability5,000 rpm (a cutting speed of 1,023 sfm, or 312 m/min.), a feed rate Diameters from .039 (1 mm) of 0.118 ipt (0.3 mm/tooth) and a 0.035" (0.9mm) DOC.When the same test was per-formed using Secos Steadyline sys-tem, it was possible to increase cuttingdepthby2.3times,to 0.087", without unwanted vibra-tion, the authors wrote.Similarresultswereobtained whenboring42CrMo4chrome-moly steel, where the boring time was reduced from 12 to just 2 hours,Mikron Corp. Monroemore than an 80 percent reduc- 06468 Monroe, [email protected]. The study further recommendswww.mikrontool.comthat damped bars be mounted di-ctemag.com/cteguide.com29ShopOps.indd 29 2/14/18 3:18 PM'