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
S P I N D L E S Y S T E M DUA L CON T AC T
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.
Increased Contact Diameter (Example of BT50) BIG-PLUS ®
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
BIG-PLUS ® 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 Gauge. In order to protect the spindle or prevent possible accident, only use tool holders with the BIG-PLUS trademark.
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