Introduction
The minute wheel is a key component of the motion works, transferring rotation from the cannon pinion to the hour wheel. If the minute wheel is incorrect—wrong tooth count, wrong pinion size, or wrong arbor length—the hands will slip, bind, misalign, or display incorrect time. This guide explains how to choose the correct minute wheel for your mechanical clock.
Understanding What the Minute Wheel Does
Transfers motion to the hour wheel
The minute wheel meshes with the cannon pinion and drives the hour wheel through the motion works.
Controls hand alignment
Proper tooth count and mesh ensure accurate minute‑to‑hour hand synchronization.
Maintains smooth hand rotation
Incorrect wheels cause binding, slipping, or uneven hand movement.
Key Features of Minute Wheels
Tooth count
Must match the motion‑works ratio for accurate time display.
Pinion size
The pinion must mesh correctly with the hour wheel or intermediate wheel.
Arbor length and pivot size
Determine how the wheel fits between the front plate and motion‑works bridge.
How to Identify the Correct Minute Wheel
Match the tooth count
Even a one‑tooth difference disrupts the minute‑to‑hour ratio.
Check the pinion diameter
Incorrect pinion size causes binding, skipping, or misaligned hands.
Verify arbor length and pivot diameter
The arbor must fit the motion‑works support points without friction or excess play.
Matching Minute Wheels to the Movement
Identify the movement manufacturer
Hermle, Urgos, and Kieninger specify exact tooth counts and pinion sizes for each model.
Match the cannon pinion
The minute wheel must mesh smoothly with the cannon pinion’s drive teeth.
Check hour wheel compatibility
The minute wheel must deliver proper rotation to the hour wheel for accurate timekeeping.
Common Minute Wheel Materials
Brass minute wheels
Most common and ideal for smooth, low‑friction operation.
Steel pinions
Provide durability and long‑term wear resistance.
Alloy arbors
Used in modern clocks for improved strength and precision.
Common Mistakes When Choosing Minute Wheels
Incorrect tooth count
Causes incorrect hour‑hand rotation or misalignment.
Wrong pinion size
Leads to binding, skipping, or uneven hand motion.
Incompatible arbor length
Results in poor alignment with the cannon pinion or hour wheel.
Recommended Internal Links
- How to Choose the Right Clock Center Wheels
- How to Choose the Correct Clock Third Wheels
- How to Choose the Correct Clock Fourth Wheels
- How to Choose the Right Clock Cannon Pinions
FAQs
How do I know which minute wheel my clock needs?
Match the tooth count, pinion size, arbor length, and pivot diameter to the original movement.
Why are my clock hands misaligned?
The minute wheel may have the wrong tooth count or may not mesh correctly with the cannon pinion.
Can I reuse an old minute wheel?
Only if the teeth and pivots are in excellent condition.
Do minute wheels from different brands interchange?
Only if the tooth count, pinion size, and arbor dimensions match exactly.
Why does my hour hand move inconsistently?
An incorrect minute wheel can cause uneven or incorrect hour‑hand rotation.
0 comments