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
R
• 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
3
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