BIG DAISHOWA High Performance Tooling Solutions Vol 3

BIG-PLUS OVERVIEW

BIG-PLUS

Conventional

FIT

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 gage line. On the contrary, a BIG-PLUS tool holder is supported on the flange face, which brings remarkable improvement to rigidity. THE BIG-PLUS SPINDLE SYSTEM IS AN ORIGINAL DEVELOPMENT OF BIG DAISHOWA SEIKI CO., LTD.

INCREASED CONTACT DIAMETER (EXAMPLE OF BT50) BIG-PLUS

CONVENTIONAL

Taper No.

Conventional

BIG-PLUS

SPACE

CONTACT

CV50 CV40 BT30

Ø2.750 Ø1.750 Ø1.250

Ø3.875 Ø2.500 Ø1.811

PERFECT INTERCHANGEABILITY BIG-PLUS tool holders can be used on existing standard machine spindles. Existing standard tool holders can also be used on BIG-PLUS spindles. In this case, however, simultaneous contact cannot be attained. Although other simultaneous contact systems require exclusive new accessories, BIG-PLUS tooling uses existing accessories such as a tool presetter and tool holder fixture as it is based on a conventional steep taper shank. Further, it is not necessary to modify tool magazines and ATC devices of existing machines.

EXISTING ACCESSORIES UTILIZED

BIG-PLUS SPINDLE + BIG-PLUS HOLDER CONTACT

CONVENTIONAL SPINDLE + BIG-PLUS HOLDER

Tool Presetter

BIG-PLUS Holder

CLEARANCE

Tooling Fixture

Conventional Holder

Tool Storage System

BIG-PLUS spindles have been adopted by licensed machine or spindle builders around the world under strictly controlled dimensions using BIG’s master gage. In order to protect the spindle or prevent possible accident, only use tool holders with the BIG-PLUS trademark.

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