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...

THE BIG-PLUS SPINDLE SYSTEM IS AN ORIGINAL DEVELOPMENT OF BIG DAISHOWA SEIKI CO., LTD. DUAL CONTACT SPINDLE SYSTEM Condition #2 Flange Contact Only Limited or No Taper Contact • Dual contact of taper and flange face after clamping • Poor runout accuracy • Severe chatter and vibration • Spindle damage Condition #3 Taper Contact Only No Flange Contact • Features of BIG-PLUS are voided Elastic Deformation • Works same as taper-only contact tooling Inspection Results of Sample Non-Licensed Dual Contact Tooling 25 Samples — 40 & 50 Taper “Dual Contact” Measured According to the BIG-PLUS Standard 40%...

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