BBT30 Sidelock 6, 63MM GAUGE LENGTH

Description

BBT (Big Plus BT also known as Dual Contact) arbors offer several advantages over conventional BT arbors, particularly when it comes to rigidity and precision. The key difference is that BBT arbors provide dual-contact between the spindle taper and flange face, unlike traditional BT holders that only make contact at the taper. This dual-contact setup improves stability and machining performance, especially at high speeds or under heavy cutting loads.

Key benefits of BBT arbors over BT arbors include:

1. Improved Rigidity: The additional contact at the flange face, along with the taper, enhances the overall stiffness of the connection, reducing deflection and vibration. This leads to better surface finishes and more accurate machining results​
2. Reduced Chatter and Vibration: Dual contact helps mitigate spindle “bell-mouthing” and ensures better concentricity, improving tool life and surface quality. In high-speed machining, this reduces the risk of tool holder movement, which is a common issue with standard BT holders​
3. Higher Precision: The increased rigidity and more secure fit in the spindle allow for better dimensional accuracy, especially in the Z-axis, as the tool holder stays more stable during operation​
4. Compatibility: BBT arbors can still be used in machines with conventional BT spindles, though the dual contact benefits are realized fully in BBT-compatible spindles​

These improvements make BBT arbors ideal for high-precision machining tasks, such as in the aerospace, medical, and automotive industries.