Sandvik Coromant Quick Change for CNC Lathes - Manual (Page 25)

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CBI - Bolt on interface CDI
The bolt on interfaces are unique to each machine tool builder. The machine
adapted clamping units (MACU) suit the specific machine model.
CDI (Coromant Capto Disc Interface) was developed as a turret interface
which can be standardized on regardless of the machine type. It is mainly
European machine builders who supply CDI as a replacement to VDI.
Sub spindle
To be able to complete a part often machining from
both sides is required. Sub spindles are often used in
combination with a bar feed and with this combination
unmanned production of completed parts is possible.
Lower revolver
For higher volume production the lower revolver can
halve the cycle time compared to a single revolver.
Typical applications are long slender components like
shafts and machines with sub spindles. The draw
backs of the lower revolver are reduced component
diameter and increased programming and set up time
making it suitable mainly for turning centers bought
for dedicated components.