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How to Use a Dead Center
Guide · Updated October 28, 2026
A dead center does not turn; the work spins on its point. It is more accurate and rigid than a live center because there are no bearings, which is why it is used for precision turning and grinding between centers. The trade-off is friction: it needs lubrication and moderate speeds.
Check concentric diameters
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Step by step
- Choose the center: Hardened or carbide-tipped for the tailstock; a soft center in the headstock can be trued in place.
- True the headstock center: Take a light cut on the 60° point with the compound at 30° so it runs dead true.
- Center drill the work: Clean 60° center holes at both ends.
- Lubricate: Put center lube or a grease with molybdenum/white lead substitute in the tailstock hole.
- Drive with a dog: Use a drive plate and lathe dog.
- Set pressure: Snug, then back off slightly; recheck as the part warms and expands.
- Keep speeds moderate: Keep surface speed at the center modest; carbide-tipped centers tolerate more.
Worked example
A 10 in steel shaft warms by 20 °F during turning. Growth = 10 × 0.0000064 × 20 = 0.0013 in. That expansion jams the dead center harder, adds friction and heat, and can score the center hole. Back the tailstock quill off about 0.001 in (a small fraction of a turn) after the first few passes, then recheck feel.
Why dead centers are more accurate
A live center has bearing runout, even if only 0.0001–0.0002 in. A dead center has none, so the part rotates on true points, and if the headstock center was trued in place the axis is exact.
Common problems
A blue or squealing center means not enough lube or too much pressure. Scored center holes mean dirt or too much speed. Taper means tailstock offset.
Tips
- Driving: use a lathe dog.
- Live centers: use a live center.
- Alignment: align the tailstock.
FAQ
What is a dead center?
A non-rotating center the work spins on.
Dead or live center?
Dead for precision between centers; live for general work.
What lube for a dead center?
Center lube or a heavy grease.
Why does my center burn?
Too much pressure, speed or not enough lubrication.
Can I true a headstock center?
Yes, a soft center is cut in place with the compound at 30°.
Related guides and calculators
- How to Turn Between Centers With a Lathe Dog
- How to Use a Live Center
- How to Align a Lathe Tailstock
- How to Center Drill and Spot Drill
- How to Use a Bench Center
- How to Cut Buttress Threads on a Lathe
- How to Cut a Face Groove on a Lathe
- How to Turn a Journal on a Lathe
- How to Use a Center Gage (Fishtail)
- All free machinist calculators
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