BIGBIG DAISHOWAs nousm-onBBT30 TOOLINGHigh-Performance Tooling for Precision MachiningBIG-PLUS OVERVIEWBIG DAISHOWABIG-PLUS DUAL CONTACTBIG-PLUSConventionalBIG-PLUSDUAL CONTACTFITSIMULTANEOUS TAPER FLANGE FITSPACEBIG-PLUS surpasses all other spindle concepts whileoffering interchangeability with existing machines andtool holders.Improved surface finish dimensional accuracyExtended toollifeElimination of Z-axial movement at high speedsBASIC CONCEPTThe BIG-PLUS Spindle System is based on the most current available standards in ASME B5.50,JIS B6339 and DIN69871.A conventional steep taper tool holder is supported on a reference diameter called the gage line.On thecontrary,a BIG-PLUS tool holder is supported on the flange face,which brings remarkable improvement to rigidity.Increased Contact Diameter(Example of BT50)BIG-PLUSConventionalTaper2BIG-PLUSNo.CONTACTSPACEBT30PERFECT INTERCHANGEABILITYBIG-PLUS tool holders can be used on existing standard machine spindles.Existing standard tool holders can alsobe used on BIG-PLUS spindles.In this case,however,simultaneous contact cannot be attained.Although othersimultaneous contact systems require exclusive new accessories,BIG-PLUS tooling uses existing accessoriessuch as a tool presetter and tool holder fixture as it is based on a conventional steep taper shank.Further,it is notnecessary to modify tool magazines and ATC devices of existing machines.BIG-PLUS SpindleConventional SpindleExisting Accessories UtilizedBIG-PLUS HolderBIG-PLUS HolderTool PresetterCONTACTCLEARANCEBIG-PLUSHolderTooling FixtureConventionalToolStorageHolderSystemBIG-PLUS OVERVIEWBIG DAISHOWATHE BIG-PLUS SPINDLE SYSTEM IS AN ORIGINAL DEVELOPMENT OF BIG DAISHOWA SEIKI CO..LTDBIG-PLUS spindles have been adopted by licensed machine and spindle builders around the world under strictly controlled dimensions using BIG's master gageIn order to protect the spindle or prevent possible accident,only use tool holders with the BIG-PLUS trademarkIMPROVEMENT OF ATC REPEATABILITYThe BIG-PLUS Spindle System ensures the highest precision location of the tool holder in the spindle when usingthe ATC for loading tools as a result of the dual contact,which precisely positions the tool holder within 1 micron.ATC RepeatabilityWITHINumDual Contact (BIG-PLUS]Test BarPulling ForceNo.of Times of ATC[Zero Runout]800kgMINIMIZED DEFLECTION FOR MAXIMUM MACHININGACCURACY SUPERIOR FINISHBIG-PLUS simultaneous contact enhances machiningrigidity with the larger contact diameter of the toolholder flange face,reducing deflection and improvingaccuracy and finish.BIG-PLUSConventional3STRICT GAGE CONTROLBIG-PLUS spindles produced by the licensed machine and spindle builders are strictly controlled in dimensions bythe original BIG master gage.Only BIG-PLUS trademarked tool holders can achieve the optimal performance fullyand safely.Gages for Machine SpindleMaster GageMeasuring DeviceMaster ArborBIG-PLUS Spindle System Machine BuildersThe BIG-PLUS Spindle System is offered by many of the world's leading manufacturers of machining centers.Some of themachine and spindle builders who have produced BIG-PLUS spindles are as follows:ACCUWAY,ADVANCED MACHINE,ALEX-TECH,AMS,ANCA,AONO GIKEN,ARES,ASADA SEIKI,ASA TECH,AWEA,BERG SPANNTECHNIKBFW,BOST,BROTHER,CERI,CHEVALIER,CHUO-SEIKI,CITIZEN,COLGAR,D.S.TECHNOLOGIE,DAH LIH,DAITO,DAIYA SEIKI,DIXI,DMCDMG MORI PRECISION BORING,DMG MORI SEIKI,DOOSAN,EGIN-HEINISCH,EGURO,EMCO,ENSHU,FADAL,ANUC,FEELER,FEMCO,FIRST.FIRST,FISCHER,FOREST-LINE,FPT,FRANZ KESSLER,GIDDINGS LEWIS,GMN,GROB,GTI,HAIDE,HARDINGE,HARTFORD,HEYLIGENSTAEDTHISION,HNK,HOMMA,HORKOS,HOWA,HSD,HST,HURCO,HWACHEON,IBAG,IBARMIA INNOVATEK,IKEGAI,INOUE KOSOKU KIKALJHENG TAI,JOBS,JOHNFORD,JTEKT MACHINE SYSTEMS,JTEKT,JUNGWOO M.S.,JYOTI,KARATS,KASHIFUJI,KASWIN,KENTURN,KIRAKITAMURA,KIWA,KMT,KOMATSU NTC,KONDIA,KOYO,KPTEC,LAZZATI,LMW,MAG,MAGNIX,MAKINO,MAKINO SEIKI,MANDELLI,MATSUURA,MAZAK,MCM,MECTRON,MILLTRONICS,MITSUI SEIKI,MOTOKUBO,MTE,MYL,N.S.S,NACHI,NAKAMURA,NEWAY,NICOLAS CORREA,NIDECMACHINE TOOL,NIDEC OKK,NIIGATA,NIPPON BEARING,NISHIJIMAX,NISSIN-MFG,NOMURA,NORTHLAND TOOL,NSK,NUMEN,O-M,OBATAKE,OHTORI,OKUMA,OMLAT,OMV,OVERMACH,PAMA,PDS,PIETRO CARNAGHI,PMC,QUASER,REIDEN,ROKUROKU,ROYAL,RS TEC,SAJO.SEMA,SEMPUCO,SETCO,SHAN RONG,SHIBAURA,SHODA,SHW,SKF USA,SKG,SKODA,SKYNC,SMEC,SNK,SODICK,SORALUCE,SPINDER,SPINTEC,SPINTRUE,SPS,STARRAGHECKERT,STUDER,SUFENG,SUGINO,SUNWOO,SUPERIOR SPINDLE SERVICE,SWIFT,TAJMAC-ZPSTAKAMAZ KIKAI KOUGYOU,TAKISAWA,TANABE,THETA,TONGTAI,TOS KURIM,TOS VARNSDORF,TOYO SEIKI,TSUDAKOMA,TSUGAMIUGINT,UTSUNOMIYA,VICTOR TAICHUNG,VTEC,VYU CHENG,WALDRICH COBURG,WELE,WIA,YAMASAKI GIKEN,YAMASHINA SEIKI,YASDA,YASUNAGA,YCM,YU HUNG,ZAYER[As of September 2025]Bold company names are North American licensed BIG-PLUS spindle rebuilders