BIG-PLUS Licensed vs Unlicensed

BIG-PLUS is a dual contact spindle system where the shank contacts the spindle taper and the spindle face simultaneously, resulting in increased tool rigidity.

SPINDLE SYSTEM DUAL CONTACT

BIG DAISHOWA BIG-PLUS DUAL CONTACT Not All Dual Contact Tooling is the Same! Important information inside about BIG-PLUS and manufacturers who claim to offer dual contact tooling systems.

THE BIG-PLUS SPINDLE SYSTEM IS AN ORIGINAL DEVELOPMENT OF BIG DAISHOWA SEIKI CO., LTD.

BIG-PLUS — The World’s Most Rigid Dual Contact Spindle System Adopted by more than 100 machine tool builders for over the past 20 years, thousands of machines and tens of thousands of BIG-PLUS tool holders are in operation today. Due to the popularity of BIG-PLUS, many tooling companies, without a proper license agreement, gauges, or manufacturing specifications & tolerances are offering dual contact tooling. The achievement of dual contact is only possible by strict control of flange face location to taper gauge line.

BIG-PLUS

Conventional

FIT

Simultaneous Taper & Flange Fit BIG-PLUS surpasses all other spindle concepts while offering interchangeability with existing machines and tool holders. • Improved surface finish & dimensional accuracy • Extended tool life • Prevention of fretting corrosion caused by heavy cutting • Improvement of ATC repeatability • Elimination of Z-axial movement at high speeds • Improved roundness of boring operations

SPACE

Basic Concept The BIG-PLUS Spindle System is based on the most current available standards in ASME B5.50, JIS B6339 and DIN 69871. A conventional steep taper tool holder is supported on a reference diameter called the gauge line. On the contrary, a BIG-PLUS tool holder is supported on the flange face, which brings remarkable improvement to rigidity.

Distance Between the Taper Gauge Line and Tool Flange is the Critical Dimension for BIG-PLUS

Taper Gauge Line

Flange Face

BIG-PLUS Dual Contact Works on a Very Small Amount of Spindle Elastic Deformation Taper contact before clamping is very important and therefore the dimension and tolerance for the flange face is extremely critical to achieving dual contact. There are 3 possible outcomes depending on the actual tool holder specification. The Current Market Contains Many Suppliers of Dual Contact Tooling Who Are NOT Licensed for BIG-PLUS Without the license, they have neither the exclusive gauges nor dimensions and tolerances for the critical relationship of taper to flange. We acquired many of these tools from all regions of the world and inspected them with our gauges.

THE BIG-PLUS SPINDLE SYSTEM IS AN ORIGINAL DEVELOPMENT OF BIG DAISHOWA SEIKI CO., LTD.

Condition #1 Proper Fit

Condition #2 Flange Contact Only Limited or No Taper Contact • Poor runout accuracy • Severe chatter and vibration • Spindle damage Condition #3 Taper Contact Only No Flange Contact • Features of BIG-PLUS are voided • Works same as taper-only contact tooling

• Dual contact of taper and flange face after clamping

STANDARD

Elastic Deformation

Gap

Inspection Results of Sample Non-Licensed Dual Contact Tooling 25 Samples — 40 & 50 Taper “Dual Contact” Measured According to the BIG-PLUS Standard

40% — Flange contact only, not to specification

16% — Allowable tolerance

44% — Taper contact only, not to specification

Condition #2 Flange Contact Only Limited or no taper contact

Condition #1 Proper Fit Taper & Flange Contact Allowable tolerance range for BIG-PLUS

Condition #3 Taper Contact Only No flange contact

Strict Gauge Control BIG-PLUS spindles produced by licensed machine tool or spindle builders are strictly controlled in dimensions by the BIG original Master Gauge. Only BIG-PLUS trademarked tool holders can achieve the optimal performance fully and safely. BIG DAISHOWA Produces and Maintains All Spindle and Tool Holder BIG-PLUS Gauges World-Wide For Licensed Companies Only

Gauges for Machine Spindle

Master Gauge

Measuring Device

Master Arbor

BIG-PLUS Spindle System Machine Tool Builders The BIG-PLUS Spindle System is offered by many of the world’s leading manufacturers of machining centers. Some of the machine 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 SPANNTECHNIK, BFW, BOST, BROTHER, CERI, CHEVALIER, CHUO-SEIKI, CITIZEN, COLGAR, D.S.TECHNOLOGIE, DAH LIH, DAITO, DAIYA SEIKI, DIXI, DMC, DMG MORI PRECISION BORING, DMG MORI SEIKI, DOOSAN, DYNOMAX , EGIN-HEINISCH, EGURO, EMCO, ENSHU, FADAL, ANUC, FEELER, FEMCO, FIRST, FIRST, FISCHER , FOREST-LINÉ, FPT, FRANZ KESSLER, GIDDINGS & LEWIS, GMN, GROB, GTI , HAIDE, HARDINGE, HARTFORD, HEYLIGENSTAEDT, HISION, HNK, HOMMA, HORKOS, HOWA, HSD, HST, HURCO, HWACHEON, IBAG, IBARMIA INNOVATEK, IKEGAI, INOUE KOSOKU KIKAI, JHENG TAI, JOBS, JOHNFORD, JTEKT MACHINE SYSTEMS, JTEKT, JUNGWOO M.S., JYOTI, KARATS, KASHIFUJI, KASWIN, KENTURN, KIRA, KITAMURA, 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, NICOLÀS CORREA, NIDEC MACHINE 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, ROKU ROKU, 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-ZPS, TAKAMAZ KIKAI KOUGYOU, TAKISAWA, TANABE, THETA, TONGTAI, TOS KURIM, TOS VARNSDORF, TOYO SEIKI, TSUDAKOMA, TSUGAMI, UGINT, UTSUNOMIYA, VICTOR TAICHUNG, VTEC, VYU CHENG, WALDRICH COBURG, WELE, WIA, YAMASAKI GIKEN, YAMASHINA SEIKI, YASDA, YASUNAGA, YCM, YU HUNG, ZAYER (As of April 2024)

• Bold company names are North American licensed BIG-PLUS spindle rebuilders

BIG-PLUS Tooling Licensees The following companies are licensed for production, sales, and use of the BIG-PLUS trademark:

SUMITOMO

BIG DAISHOWA INC BIG KAISER PRECISION TOOLING LTD SANDVIK COROMANT

REGO-FIX YUKIWA SEIKO USA, INC SHOWA TOOL CO, LTD

Only Select BIG-PLUS Tooling from These Licensed Companies and ACCEPT NO IMITATIONS OR COPIES All products will be clearly marked with the following indications on all parts:

BIG-PLUS Spindle System License BIG Daishowa Seiki

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