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How Mechanical Clocks Work
Every mechanical clock, from a tiny carriage clock to a tower clock, is built from the same five ideas. A practical guide from the clock specialists at Wyattviano Co. in Glendale, Arizona.
- Experienced Clock Technicians
- Antique Clock Specialists
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Why This Guide Matters
Every mechanical clock, from a tiny carriage clock to a tower clock, is built from the same five ideas. This guide sets out what we have learned about mechanical clock theory across thousands of repairs on the bench at 5720 W Frier Dr in Glendale, Arizona, written for owners rather than for technicians.
Everything below is practical. Where a task is safe for an owner, we say so and explain how. Where a task belongs on a professional bench, we say that too, because the fastest way to turn a small repair into an expensive one is enthusiastic improvisation.
If you have questions as you read, call (623) 847-5184. Phone advice is free, and a five-minute conversation often saves a service call.
Key Points at a Glance
- A power source stores energy
- A gear train transmits it
- An escapement releases it in beats
- An oscillator sets the rate
- An indication system shows the result
Power: Weights and Springs
Weight-driven clocks store energy as gravitational potential energy; spring-driven clocks store it as elastic energy in a coiled steel band. Weights deliver almost perfectly constant force, which is why the most accurate mechanical clocks ever built are weight driven.
In practice, most owners in Glendale and across the West Valley encounter this within the first few years of owning a mechanical clock, and it is far more common than genuine mechanical failure.
The Going Train
A series of wheels and pinions steps the slow, powerful rotation of the barrel or drum up to the fast, weak rotation of the escape wheel. The tooth counts of that train determine exactly how the hands relate to the passage of time.
If you are unsure at any point, stop and call us. Diagnosing mechanical clock theory over the phone costs nothing, and we would rather talk you through it than repair the consequences.
The Escapement
The escapement locks and releases the escape wheel once per beat, converting continuous force into discrete impulses. It also gives the pendulum or balance the small push it needs to keep swinging against friction and air resistance.
This is also one of the areas where a documented professional service pays for itself, because a technician sees the pattern immediately.
The Oscillator
A pendulum's period depends on its effective length, which is why raising the bob speeds the clock and lowering it slows the clock. A balance wheel and hairspring do the same job where a pendulum would be impractical.
Owners who understand this one point tend to keep their clocks running for decades without incident.
Need Expert Help With Your Clock?
Wyattviano Co. provides mechanical clock theory guidance, repair and restoration throughout Glendale and the West Valley. Free estimates, honest pricing.
Strike and Chime Trains
Striking clocks contain a second, and sometimes a third, independent train with its own power source, governed by a fly to control speed. Rack-and-snail and count-wheel systems are the two classic ways of deciding how many blows to strike.
In practice, most owners in Glendale and across the West Valley encounter this within the first few years of owning a mechanical clock, and it is far more common than genuine mechanical failure.
Friction, Oil and Wear
Every pivot turning in a plate hole loses energy to friction, and oil exists to reduce that loss. When oil dries, friction rises, amplitude falls and the clock eventually stops.
If you are unsure at any point, stop and call us. Diagnosing mechanical clock theory over the phone costs nothing, and we would rather talk you through it than repair the consequences.
Why Clocks Drift
Temperature changes pendulum length, barometric pressure changes air drag, and mainspring force falls as it unwinds. Compensation pendulums, fusees and remontoires were all invented to fight these effects.
This is also one of the areas where a documented professional service pays for itself, because a technician sees the pattern immediately.
Reading Your Own Clock
Understanding these principles turns a mysterious box into a machine you can observe intelligently. It also makes conversations with your technician far more productive.
Owners who understand this one point tend to keep their clocks running for decades without incident.
Working With Wyattviano Co.
We are a specialist clock repair and restoration workshop in Glendale, Arizona, serving Glendale, Phoenix, Peoria, Surprise, Sun City, El Mirage, Tolleson, Avondale, Goodyear and Litchfield Park and the surrounding Maricopa County communities. Our work covers antique, grandfather, wall, mantel, cuckoo and mechanical clocks, along with full restoration and house call service.
Every clock receives a free estimate, a documented record of the work performed and a minimum fourteen-day test run before it goes home. Original parts are always returned to you.
To discuss mechanical clock theory or any other clock question, call (623) 847-5184, email [email protected], or use the request form below.
Frequently Asked Questions
Power: Weights and Springs?
Weight-driven clocks store energy as gravitational potential energy; spring-driven clocks store it as elastic energy in a coiled steel band. Weights deliver almost perfectly constant force, which is why the most accurate mechanical clocks ever built are weight driven.
The Going Train?
A series of wheels and pinions steps the slow, powerful rotation of the barrel or drum up to the fast, weak rotation of the escape wheel. The tooth counts of that train determine exactly how the hands relate to the passage of time.
The Escapement?
The escapement locks and releases the escape wheel once per beat, converting continuous force into discrete impulses. It also gives the pendulum or balance the small push it needs to keep swinging against friction and air resistance.
The Oscillator?
A pendulum's period depends on its effective length, which is why raising the bob speeds the clock and lowering it slows the clock. A balance wheel and hairspring do the same job where a pendulum would be impractical.
Strike and Chime Trains?
Striking clocks contain a second, and sometimes a third, independent train with its own power source, governed by a fly to control speed. Rack-and-snail and count-wheel systems are the two classic ways of deciding how many blows to strike.
Can Wyattviano Co. help with mechanical clock theory in Glendale, AZ?
Yes. We provide advice, repair, restoration and maintenance relating to mechanical clock theory across Glendale and the wider West Valley, with free estimates and house calls where appropriate. Call (623) 847-5184.
How often should a mechanical clock be professionally serviced?
Every five to seven years for a full clean and oil, with the shorter interval preferred in Arizona's dry heat, plus routine owner maintenance in between.
Request Service or a Free Estimate
Tell us about your clock and we will respond with honest guidance and a written estimate. Prefer to talk it through? Call (623) 847-5184.