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Rigidity of verticaltravel improved forfaster feed ratesMulti-axisNo. 2008Idea bulletinHigh speed dual spindlemulti-axis boring machineApplicationAn American motorcyclemanufacturer was gearing upfor increased production oftheir large touring motorcycles.Operations required on thisdual spindle multi-axis boringmachine were center drill <strong>and</strong>spot face for the first spindle<strong>and</strong> 1-1/2” boring operationsfor the second spindle. Thematerial being worked wasTimken cast iron.ChallengeBecause the existing 10-yearolddual spindle drilling <strong>and</strong>boring machine could not keepup with required productionrates, the manufacturer decidedto replace it.Among the highest prioritiesfor the replacement machinewas a design with morevertical rigidity to allow forfaster feed rates <strong>and</strong> shortercycle times.SolutionCustom designed boring machine withmore vertical rigidity to allow for fasterfeed rates <strong>and</strong> shorter cycle times.Through a joint developmentprocess including themanufacturer, the machine toolbuilder <strong>and</strong> <strong>Gilman</strong> <strong>USA</strong>, a unitwas designed that met all ofthe end-use requirements. Thebase chosen was a hardenedsteel way slide with preloadedground ball screw driven by asingle phase motor.A vertical angle bracketsupports another hardenedsteel way slide with a preloadedground ball screw driven by asingle-phase motor. Spindleschosen were all <strong>Gilman</strong> model6500B with a <strong>block</strong> housing<strong>and</strong> triplex ball nose bearingarrangement <strong>and</strong> labyrinthseal. The shaft nose was50 NMTB taper. The designretained the single motordrive. The customer-suppliedreduction unit turns the firstspindle at 2,900 rpm <strong>and</strong>the second spindle at 1,950rpm.60 ©2011 <strong>Gilman</strong> <strong>USA</strong>, LLC
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