Ogee design by Chauncey Jerome halts after 30 hours - Issues encountered with trundles
For clock enthusiasts and hobbyists, the task of replacing worn trundles in a **Chauncey Jerome 30-hour Ogee weight-driven clock** can be both challenging and rewarding. This article provides a step-by-step guide to help you replace worn trundles safely and effectively.
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## Understanding Trundles in a Clock
Trundles are small pivot points or bushings that support and guide the gears (wheels) inside the clock movement. Over time, wear can enlarge their holes, causing the gears to wobble or bind, leading to poor timekeeping or stoppages.
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## What You'll Need
- Clock oil and cleaning supplies - Replacement trundles or bushings (brass recommended) - Small screwdriver set - Jeweler's files and fine emery paper - Small hammer and staking set (clockmaker’s tools) - Pin vise or small drill for reaming holes - Magnifying glass or loupe - Clock movement holder - Gloves (optional, to avoid corrosion from oils on hands)
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## Step-by-Step Replacement Process
### 1. Prepare the Workspace - Work on a clean, flat surface with good lighting. - Lay out paper towels or a cloth to catch small parts. - Take photos or notes of the movement before and as you disassemble to ensure correct reassembly.
### 2. Remove the Movement from the Case - Carefully remove the clock hands and dial (usually by loosening screws or nuts). - Unscrew or unclip the movement from the wooden case. - Secure the movement in a movement holder to keep it steady during the repair.
### 3. Identify Worn Trundles - Examine the pivot holes where the arbor (axle) enters the plates. - Look for oval-shaped holes or excessive wear using a loupe. - Gently move the arbor side to side; excessive play signals worn trundles.
### 4. Remove the Movement Plates - Unscrew the screws holding the front and back plates together. - Carefully separate the plates, supporting the wheels, springs, and gears. - Keep parts organized in order.
### 5. Remove the Worn Trundles - Depending on the design, trundles may be pressed into the plates or fixed with solder. - Use a staking set or small punch to carefully drive out the worn trundles from the plate. - Take care not to distort or damage the plates.
### 6. Prepare the Pivot Hole - Clean the trundle hole with a small drill or broach to remove debris. - If the hole is worn irregularly, slightly enlarge it to fit the new trundle snugly. - Test-fit the new trundle, which should be brass and of correct diameter.
### 7. Install New Trundles - Press or gently hammer the new trundles into the plate using a staking set. - The trundle should be flush with the plate surface and firmly seated. - Ensure the hole in the new trundle is smooth and aligned.
### 8. Reassemble the Movement - Carefully reassemble the movement plates ensuring wheels and arbors are seated correctly in the new trundles. - Check for smooth rotation of gears and no binding. - Lubricate the pivot points lightly with clock oil.
### 9. Test the Movement - Place the movement back in the case. - Reattach the dial and hands. - Hang the weights and start the pendulum swinging. - Observe the clock for steady running and correct timekeeping.
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## Tips and Warnings
- **Delicacy:** Trundles and pivots are delicate; avoid excessive force to prevent damage. - **Matching parts:** If you can’t find exact trundles, consult a professional clock parts supplier or clockmaker. - **Cleaning:** Before reassembly, clean the movement to remove old oil and dirt. - **Professional help:** If unsure, consult a professional horologist, especially with antique clocks to preserve value.
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## The History of Chauncey Jerome
Chauncey Jerome made a historic contribution to the American clock industry in the 18th century, substituting brass works for wooden works. The clock in question, a number 11 Ogee made by Chauncey Jerome in 1855, is a 156-year-old American clock. Despite Jerome's company ultimately failing in 1856, his legacy continues to inspire clock enthusiasts today.
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## Maintaining Your Clock
Regular maintenance is essential to keep your clock running smoothly. If a clock stops and there is a gear meshing issue, then it is time to replace the trundles. If the trundles are a little worn and the clock runs well, they can be left as-is. The repair of the trundles requires removing the cap from the escape wheel.
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## Conclusion
Replacing worn trundles in a Chauncey Jerome 30-hour Ogee clock involves disassembling the clock movement, removing the worn bushings, fitting new brass trundles, and reassembling with care. Proper alignment, lubrication, and testing ensure your clock runs smoothly again. With patience and attention to detail, you can successfully repair your antique clock and preserve its historical value.
- If you're a fan of vintage clocks and smart-home devices, you might be interested in integrating a clock repair skill into your collection of gadgets, mixing old-world craftsmanship with modern technology.
- In the process of replacing worn trundles in a vintage clock like the Chauncey Jerome 30-hour Ogee, you could encounter opportunities to explore and experiment with different clock repair techniques, potentially delving into the repair of smart-home devices as well.
