Introduction
Warning wheels control the brief “warning run” that occurs just before a clock strikes or chimes. Choosing the wrong warning wheel leads to early strike, late strike, double strike, or a train that won’t enter warning at all. This guide explains how to choose the correct warning wheel for your mechanical clock.
Understanding What Warning Wheels Do
Control the pre‑strike/pre‑chime warning run
The warning wheel rotates briefly before the strike or chime begins.
Coordinate timing between trains
Proper warning timing ensures the strike or chime begins exactly on the hour or quarter.
Engage with the stop lever
The warning wheel pin or cam must align with the stop lever for correct release.
How to Identify the Correct Warning Wheel
Count the teeth
Tooth count determines rotation speed and timing accuracy.
Measure the arbor bore
The bore must match the warning arbor precisely to avoid wobble or binding.
Check the warning pin or cam position
The pin must align with the stop lever at the correct point in the cycle.
Matching Warning Wheels to the Movement
Identify the movement manufacturer
Hermle, Urgos, and Kieninger use specific warning wheel geometries and pin positions.
Match the strike or chime train
Warning wheels differ between hour strike, half‑hour strike, and Westminster chime trains.
Check the stop lever geometry
The warning pin must contact the stop lever at the correct angle and height.
Common Warning Wheel Materials
Brass wheels
Most common and ideal for smooth, long‑term operation.
Steel warning pins
Provide durable engagement with the stop lever.
Alloy wheels
Used in some modern movements for reduced friction.
Common Mistakes When Choosing Warning Wheels
Incorrect tooth count
Causes early or late strike/chime release.
Wrong arbor bore
Leads to wobble, binding, or timing drift.
Misaligned warning pin
Prevents the train from entering or exiting warning correctly.
Recommended Internal Links
- How to Choose the Correct Clock Gathering Pallets
- How to Test a Clock Train During Reassembly
- How to Choose the Right Clock Arbors
- How to Choose the Correct Clock Gears & Pinions
FAQs
How do I know which warning wheel my clock needs?
Match the tooth count, arbor bore, and warning pin position to the original movement.
Why does my clock strike early or late?
Likely due to an incorrect warning wheel or misaligned warning pin.
Can I adjust the warning pin?
Minor adjustments are possible, but incorrect bending can cause timing issues.
Do warning wheels from different brands interchange?
Only if the bore, tooth count, and pin geometry match exactly.
Why won’t my clock enter warning?
The warning pin may be missing, misaligned, or incompatible with the stop lever.
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