Ogee profile creation by Chauncey Jerome halts due to issues with trundles
In the world of antique clock repair, one of the most common issues faced is the wearing out of trundles - the round wheels that act as axles for the lantern pinion - in a lantern pinion. This article provides a step-by-step guide on how to repair worn trundles in a Chauncey Jerome Ogee clock.
**Step-by-Step: Repairing Worn Trundles in a Lantern Pinion (Ogee Clock)**
1. **Identify the Problem** - Symptoms: A clock may stop, run erratically, or have a worn/loose feel in the movement, especially at points where lantern pinions meet wheel teeth. - Find the Lantern Pinion: Locate the lantern pinion (the pinion made of two discs with rods or “trundles” between them).
2. **Disassemble Movement Safely** - Carefully Remove the Movement: Take the movement out of the case. - Note the Layout: Document the disassembly with notes or photos to aid in reassembly. - Remove the Pinion: Take off the suspect lantern pinion from its arbor, if possible, or remove the whole arbor if necessary.
3. **Inspect Trundles** - Examine for Wear: Look for trundles that are loose, missing, or have grooves worn by the mating gear. - Check Trundle Fit: If trundles are loose in the end pieces, they may need replacement.
4. **Tighten or Replace Trundles** - For Loose Trundles: - Tighten: If trundles are simply loose, you may be able to peen (lightly hammer the end of the trundle shaft) or secure with a tiny drop of epoxy (not always recommended, as it may hinder future repairs). - For Missing or Worn Trundles: - Make or Buy New Trundles: Use music wire or similar hard steel wire of the correct diameter. - Cut to Length: Use wire cutters to create a new trundle, matching the original length. - Insert New Trundle: Fit the new wire through the lantern pinion’s holes, ensuring it’s snug. It may help to enlarge the hole slightly, but do this with care. - Secure: Peen or rivet the ends of the wire so the trundle does not rotate or fall out.
5. **Reassemble and Test** - Reassemble the Movement: Return the repaired pinion to its arbor and reassemble the clock movement. - Lubricate: Apply a tiny amount of clock oil to the trundles and pivot points. - Test Timekeeping: Run the clock and monitor its performance for several days to ensure the issue is resolved.
**Additional Tips**
- Use the Right Tools: Fine needle nose pliers, wire cutters, and a small hammer are useful. - Patience is Key: Take your time to avoid damaging the delicate brass or steel components. - Professional Help: If you are uncomfortable with the repair, consider consulting a professional clockmaker.
**Summary**
Repairing worn trundles involves identifying the affected pinion, disassembling carefully, replacing or tightening trundles, and reassembling. This is a sensitive job, but with care and patience, it can extend the life of your beautiful Chauncey Jerome clock.
In the case of the clock in question, a number 11 Ogee made by Chauncey Jerome in 1855, the trundles were found to be firmly in place and had to be cut and drilled out. This repair required a different approach due to the Ogee movement of the clock. If the trundles are a little worn but the clock runs well, the repairer tends to leave them as-is, knowing that at some future date if the clock stops, it is one of many issues to be addressed. The clock in question stopped in May 2021, after running well for 3 years. The 30-hour Ogee movement is considered a great place to start for beginners in clock repair due to its large gears, overall simplicity, and absence of mainsprings. The movement ran a couple of 30-hour cycles after the trundles were replaced, addressing the issue. The clock was last serviced in February 2018.
In the realm of antique clock repair, individuals might also be interested in fixing worn trundles in vintage clocks, such as the Chauncey Jerome Ogee clock, while incorporating the latest smart-home devices and gadgets in the form of technology. For instance, one could consider installing a clock integration system, allowing the clock to display time, weather updates, or even notifications from smart-home devices. However, while modernizing a vintage clock repair project, it's essential to maintain the clock's historical integrity and identity while enhancing its functionality with technology.
