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2.6 Gearmachineswithdegreesoffreedomformoderncorrections
Thehighlightsofthepurelymechanicalgearmachines(inotherwords,machinesequippedwithaminimumofelectricalcontrolsbutwithamaximumof“mechanicalintelligence”)willbedealtwithinthisSection.TheMachineNo.116beganthiserain1954.ThismachineisshowninFigure8.
Figure8: GlaasonNo.116HypoidGenerator,1954(Source,GleasonWorks)
Themachine,stillwidelyinusetoday.isequippedwithatiltablecutterhead,andcouldbedeliveredoptionallywith modifiedgeneratingratio(Modified-Roll)andahelicalgeneratingmechanism (helicalmotion).Itwasthefirstmachinebywhichitwaspossibletoconverthigherlevelgearingtheoryintoactualpractice.Alloftheabove-mentionedkinematicoptionswererealizedmechanicallybyusingchangegeardrives,eccentricmechanisms,andcamplates.Throughlargercutterheadtiltsoramodifiedgeneratingratio
(modifiedroll),itwaspossibletoproducepinionsofform-generatedpairs(formate
method)withthesemachines.
Ontheotherhand,Oerlikonhasconcentratedontheuseofcutterheadfitforcreatingspecialcorrectioneffects.ThefirstOerlikonmachinewithtiltablecutterheadspindleispicturedinFigure9.TheSpiromaticNo.1(SKMl)wentintoproductionin1960.Becauseitstiltwasrestrictedtoroughly10degrees,itsapplicationwaslimitedtocreatingcrowning{lengthwise}and,withinlimits,generatedcrowning.
Figure9:OertikonSpiromayicNo.1-SKMl,1960 (Source,OerlikonBuhrle)
Withthedevelopmentofcontroltechnology,electronicsfoundaplaceingearmachinesforbevelgears.ThePLCcontrolswerefirstusedonlytooptimizethestock-removaltechnology,andtoreduceprocessingtimes.ThefirstOerlikongearmachineofthisgenerationwasbroughttomarketin1973underthedesignationS17.OedikonappliedthecradleconceptfromGleasonsMachineNo.116forthecreationofcutterheadtiltand
e
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