Question 1

What is the difference between BT and BBT tool holders?

Accepted Answer

BBT (Big-Plus) tool holders provide simultaneous contact on both the taper and the spindle face. This double-contact system reduces vibration and increases rigidity compared to standard BT holders.

Question 2

Can I use a CAT40 holder in a BT40 machine?

Accepted Answer

No. Although they share the same taper angle, the flange thickness and drive notch geometry are different. Using the wrong holder can damage the spindle and the tool changer arm.

Question 3

Why is HSK becoming the standard for high-speed machining?

Accepted Answer

HSK (Hollow Shank Taper) is lighter and has a short-taper design. Centrifugal forces during high-speed rotation cause the HSK shank to expand and grip the spindle tighter, ensuring superior balance and accuracy.

Industrial CNC Tool Holder Compatibility Finder & Technical Database