BT (MAS-403-BT) and BBT (Big-Plus®) are both types of tool holders commonly used in CNC machining centers. Although they have similar functionality, there are key differences between them:
Design and production:
BT tool holders: BT tool holders have a contact point between the tool holder and the spindle. The contact surface is generally the tapered surface of the tool holder, which is in contact with the spindle taper.
BBT Toolholders: BBT toolholders feature a dual contact design with additional contact surfaces. In addition to the tapered surface, there is also surface contact between the tool holder flange of the BBT tool holder and the end surface of the spindle. This dual contact design increases rigidity and stability, providing better tool performance and precision.
Rigidity and precision:
BT tool holders: BT tool holders provide good rigidity and precision for most machining operations. However, they may have some limitations, particularly in heavy machining applications or when using long cutting tools.
BBT Tool Holders: BBT tool holders are designed for increased rigidity and precision, especially in high-speed machining and heavy cutting operations. The dual-contact design of the BBT toolholder helps minimize tool deflection, vibration and runout, thereby improving the surface finish and dimensional accuracy of machined parts.
Performance:
BT Tool Holders: BT tool holders are suitable for a variety of machining applications including milling, drilling and tapping. They are reliable and widely used in various industries.
BBT Tool Holders: BBT tool holders are designed for high-performance machining applications that require superior rigidity, precision and surface finish. They are commonly used in the aerospace, automotive and casting industries, which often have tight tolerances and demanding machining requirements.
compatibility:
BT tool holder: The BT tool holder is compatible with the standard BT spindle interface (MAS-403-BT) and is widely used in CNC machining centers around the world.
BBT Socket: The BBT Socket is designed to be compatible with pins featuring the Big-Plus® dual contact pin interface. Although BBT tool holders provide excellent performance when used with compatible spindles, they may not be compatible with all CNC machines.
Tooling system:
BT Toolholders: BT toolholders are part of the MAS-403-BT tooling system, a toolholder and spindle standard widely used in CNC machining.
BBT Tool Holders: BBT tool holders are part of the Big-Plus® tool system developed by BIG KAISER Precision Tooling Inc. The Big-Plus® system provides superior performance and precision compared to traditional tooling systems .
In summary, although BT and BBT tool holders are used as tool holders in CNC machining centers, BBT tool holders have advantages in rigidity, precision and performance due to their dual design. contact. However, the choice between BT and BBT toolholders depends on factors such as machining requirements, spindle compatibility and budgetary considerations.
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