Live Center vs Dead Center vs Face Driver
Compares the working principle, pros and cons, and use cases of the three main tools for supporting and driving lathe workpieces.
Overview
In between-centers turning (two-point support), the workpiece is held by center holes at both ends. The tools used for this are the live center, the dead center and the face driver, each with a different role. Live and dead centers mostly support the workpiece from the tailstock side, while the face driver — mounted on the spindle side — rotationally drives the workpiece while also supporting one end.
Key Features
- Live center: rotates with the workpiece on internal bearings — high-speed, low-friction support
- Dead center: fixed, non-rotating support — maximum rigidity and accuracy, generates friction heat
- Face driver: grips the workpiece face with drive pins to drive it + center support — full-length in one setup
Comparison
Aspect | Live Center | Dead Center | Face Driver |
|---|---|---|---|
Rotation | Rotates with workpiece | Fixed (non-rotating) | Transmits drive from spindle side |
Main location | Tailstock side | Tailstock / spindle side | Spindle side |
High-speed fit | Excellent | Low (friction heat) | Excellent |
Rigidity / accuracy | High | Maximum | High |
Main use | General & high-speed turning | Precision grinding & inspection | Face driving, full-length in one cut |
Live Center
Internal bearings let the center point spin in sync with the workpiece, so there is almost no friction heat or wear, making it ideal for high-speed machining. It is the standard support tool of modern CNC turning.
Dead Center
With no rotating parts it offers the highest rigidity and accuracy, but the workpiece rotates while sliding on the point, generating friction heat. It is used for low-speed precision work, grinding and inspection where rigidity matters, and requires lubrication.
Face Driver
Mounted on the spindle side, it grips the workpiece face with several drive pins to transmit rotation while a central center establishes concentricity. Without a chuck or dog it can machine the entire length of a workpiece in a single setup, making it highly efficient for volume shaft production. POINTTECH has exported face drivers to Japan since 2008.
A dead center requires lubrication and appropriate thrust to prevent friction-heat seizing. Choose a live center for high-speed, long-duration work, and a face driver when full-length machining without chucking is required.
Applications
Use a live center for most CNC and conventional turning, a dead center for high-precision grinding, measurement and low-speed work, and a face driver for volume production where a shaft's full length must be machined in one go without a chuck or dog. For help selecting the right combination for your job, contact point@pointtec.com.