The deadbeat escapement curves its pallet faces so the escape wheel is locked dead and never pushed back. Recoil disappears, and with it the escapement error that made a clock's rate depend on its drive force.
Deadbeat escapement: the recoil-free form
issue ISSUE 01checked 2026-09-16responsible Escapement Papers (a named bench, not a person)
tape card: what removing recoil buys
| Effect | Recoil escapement | Deadbeat |
|---|---|---|
| Wheel reverses | Every beat | Never |
| Rate depends on drive force | Yes | Almost no |
| Escapement error | Present | Largely removed |
| Pendulum is disturbed | Each unlock | Very little |
The change is in the pallet faces
A recoil escapement's pallet faces are angled so the wheel pushes them back as it unlocks. A deadbeat's faces are curved so that the wheel's tooth lands on a face whose tangent is concentric with the pallet's pivot. The tooth then cannot push the pallet either way, and the wheel stops dead.
| Feature | Recoil (anchor) | Deadbeat |
|---|---|---|
| Pallet face | Flat or angled | Curved, centred on the pallet arbor |
| Wheel at lock | Pushed back | Motionless |
| Impulse face | Angled plane | Separate, steeper face |
| Error from drive force | Proportional to the force | Nearly independent of it |
Why this is the escapement that made precision clocks possible
Once the rate stops depending on how hard the train is pushing, the drive can be made crude and the rate stays good. That is what allowed precision pendulum clocks to reach seconds per day and better, and it is the same idea that the lever escapement later applied to a balance.
A deadbeat clock is quieter at the escapement than a recoil clock, because there is no reversal to hear. That is a useful field test and not a substitute for measuring the rate.
Boundary: deadbeat is not detached
A deadbeat still keeps the pendulum in contact with the escapement during impulse. A detached escapement, such as a detent, gives the impulse and then leaves the oscillator alone. Deadbeat removes recoil; detachment removes contact. Two different improvements that are often described as one.
The misreading to name: assuming a deadbeat clock has no escapement error at all. It has very little, and very little is not none, particularly if the pallet faces have worn away from their curve.
The bench's position
The bench holds that a worn deadbeat is worse than a healthy recoil, because the wear flattens the curved face and quietly reintroduces the recoil the design removed. The design is not a permanent property; it is a geometry that has to survive contact.
References
- Ref 1Escapement-making (finishing), Horopedia – Watchmaking Encyclopediasupports the finishing requirements the curved pallet faces depend on
- Ref 2Polishing, Horopedia – Watchmaking Encyclopediasupports the polishing practice that preserves the pallet face curve
- Ref 3Heat treatments, Horopedia – Watchmaking Encyclopediasupports the hardening treatment a pallet face has to survive
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