Driven Tools Explained: Turning Centers That Mill
How driven (live) tooling turns a CNC lathe into a milling machine: what to check on turrets, spindles and synchronisation before you buy.
A driven tool is a small motorised spindle mounted in the turret of a turning center. With the main spindle locked or synchronised, the turret can drill cross-holes, mill flats and slots, and even cut small gears. One setup replaces two, and concentricity between turned and milled features improves dramatically.
What to Check Before Buying
- C-axis resolution and clamping: coarse C-axes limit milling accuracy.
- Tool power: driven tools typically deliver 2 to 7 kW, less than a VMC head.
- Turret size: bigger turrets carry more driven stations beside static tools.
- Y-axis: adds off-centre milling, essential for complex part families.
Understand the limits. Deep cross-drilling in tough alloy may exceed driven-tool torque; long axial holes still belong on the main spindle. Where milling dominates the cycle, a mill-turn machine with a full milling head, or a paired lathe-plus-VMC cell, may run cheaper per part.
If your turning work is shafts and sleeves rather than complex multi-face parts, a well-equipped slant bed lathe paired with a nearby VMC often beats a single multi-tasking machine on price and simplicity. Our HC series slant bed lathes with hydraulic chucks and servo turrets cover that role from 36 to 75 mm bar capacity.
Send us your part family and we will show you which operations genuinely need driven tools.
Talk to VITOP Machinery
Questions about this topic or your upcoming project? Email vitopmachinery@163.com or message us on WhatsApp: +86 183 1908 0212. Browse all machines at www.vitopmachinery.com. We reply within one business day.