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I have/had a number of these and they all had the same issue in the chime train, sooo...
The Sessions Clock Company produced some of America's most beloved timepieces, and among their finest achievements were the 8-day clocks featuring Westminster chime movements. These elegant clocks represented the pinnacle of Sessions' craftsmanship, combining reliable timekeeping with the melodious quarter-hour chimes that have graced American homes for generations.
The Heritage of Sessions 8-Day Movements
Sessions began manufacturing 8-day movements in the early 20th century, creating clocks that required winding only once per week rather than daily. This convenience made them popular among busy households, while the addition of Westminster chimes elevated these timepieces from simple timekeepers to decorative focal points. The Westminster chime sequence, originally created for London's Big Ben, became a sought-after feature in American mantel and wall clocks during the 1920s through 1950s.
These movements typically featured triple-train designs, with separate mechanisms for timekeeping, strike, and chime functions. The complexity of coordinating these three trains required precision manufacturing, and Sessions delivered this quality consistently throughout their production years.
Identifying Your Sessions Westminster Chime Clock
Sessions 8-day Westminster chime clocks came in various case styles, from ornate tambour mantel clocks to stately wall-mounted designs. The movements themselves share common characteristics that make identification straightforward. Look for the Sessions name stamped on the brass movement plates, often accompanied by model numbers or patent dates.
The Westminster chime mechanism distinguishes itself through its rod chime assembly, typically featuring four graduated rods that produce the distinctive four-note melody. Some Sessions models used tubular chimes instead, but the rod configuration was more common in their mid-range to premium offerings.
Case styles varied considerably, with popular designs including mahogany tambour cases, oak kitchen clocks, and walnut parlor models. The dial configurations ranged from simple Arabic numerals to elaborate Roman numeral faces with decorative corner spandrels and silvered chapter rings.
Common Issues With Sessions 8-Day Westminster Movements
Like all mechanical timepieces, Sessions 8-day Westminster chime clocks develop problems over decades of use. The most frequently encountered issues involve the chime mechanism itself. Worn bushings in the chime train can cause the hammers to strike incorrectly or fail to lift properly, resulting in weak or missing chime notes. The warning wheel that triggers the chime sequence often shows wear on its teeth, leading to inconsistent chiming or complete failure to activate.
The mainsprings in these triple-train movements require regular attention. After 70 to 100 years, mainsprings can lose their temper, develop set, or break completely. A broken chime spring is particularly common because the chime mechanism operates more frequently than the time or strike trains, cycling through its full sequence every quarter hour.
Pivot wear represents another widespread problem in Sessions movements. The original factory bushings gradually develop play, causing excessive clearance between pivots and plates. This manifests as erratic timekeeping, difficulty maintaining beat, and increased friction that prevents proper running even after cleaning and oiling.
The count wheel mechanism that controls the hourly strike can become misaligned or damaged, causing the clock to strike the wrong number of times. Sessions used both count wheel and rack-and-snail strike mechanisms in different models, but count wheel designs predominated in their Westminster chime clocks.
Restoration Techniques for Sessions Westminster Chimes
Restoring a Sessions 8-day Westminster chime clock requires systematic attention to each of the three trains. Begin with complete disassembly, carefully documenting the position of each component, particularly within the chime mechanism where the relationship between lifting pins, hammers, and warning wheel must be preserved.
Cleaning should employ appropriate horological solutions that remove old oil and accumulated debris without damaging brass surfaces or steel components. Ultrasonic cleaning works well for most parts, though delicate components like hairsprings and certain springs require hand cleaning with gentler methods.
Bushing replacement becomes necessary when pivot holes show measurable wear. Sessions movements typically use standard American bushing sizes, making replacement straightforward for experienced restorers. The chime train deserves particular attention during bushing work, as even slight misalignment here affects hammer timing and chime quality.
Mainspring replacement in Sessions 8-day movements requires proper sizing and installation technique. The time spring typically measures differently from the chime and strike springs, and using incorrect springs leads to poor performance or mechanical damage. When installing new mainsprings, ensure proper hooking and consistent winding tension throughout the barrel.
The escapement mechanism controls the clock's rate and requires careful adjustment during restoration. Sessions typically used Graham deadbeat escapements in their better movements, though some models featured recoil escapements. Proper pallet depth, drop, and lock ensure reliable timekeeping and minimal wear.
Maintaining Proper Chime Synchronization
One of the most challenging aspects of Sessions Westminster chime clock repair involves synchronizing the chime mechanism with the time train. The chime should complete its sequence just as the minute hand reaches each quarter-hour position, with the hour strike following immediately after the fourth quarter chime.
Synchronization problems often stem from improper hand positioning during reassembly or from wear in the lifting mechanism. The chime warning wheel must engage its detent at precisely the right moment, allowing the chime train to complete its run before the strike warning activates.
Adjusting the relationship between the chime cam and lifting pins requires patience and precise observation. Each lifting pin must contact its corresponding hammer tail at the correct moment in the sequence, producing the proper Westminster melody. Bent lifting pins or misaligned hammers create discordant sounds that detract from the clock's appeal.
The self-correcting feature found in many Sessions Westminster chime movements allows the mechanism to resynchronize automatically if the chime gets out of phase with the time. Understanding how this correction works helps during troubleshooting when synchronization issues persist after initial adjustments.
Replacing Worn Components in Sessions Movements
Finding replacement parts for Sessions 8-day Westminster chime clocks can present challenges, as the company ceased operations decades ago. However, many components used standard American specifications that remain available through specialized suppliers. Suspension springs, mainsprings, and common gears often interchange with parts from other American manufacturers of the same era.
The chime rods themselves occasionally require replacement when they become bent or develop cracks. Proper tuning of replacement rods ensures the Westminster melody sounds correctly, matching the original pitch relationships between the four notes. Some restorers successfully straighten slightly bent original rods, though severely damaged rods need complete replacement.
Hammer heads wear over time, developing grooves where they repeatedly strike the chime rods. Replacing worn hammer heads or the entire hammer assembly restores proper tone and prevents damage to the chime rods. The hammer springs also weaken with age, requiring replacement to ensure adequate striking force.
Gear teeth occasionally break or wear excessively, particularly in the chime train where constant operation accelerates deterioration. While some gears can be repaired by skilled craftsmen, severely damaged gears need replacement. Finding exact matches sometimes requires sourcing from donor movements or having custom gears manufactured.
Adjusting Sessions Clock Rate and Beat
Even after complete restoration, Sessions 8-day Westminster chime clocks require rate adjustment to achieve accurate timekeeping. The pendulum length determines the clock's rate, with longer pendulums slowing the clock and shorter pendulums speeding it up. Most Sessions mantel clocks use adjustable pendulum bobs with threaded rating nuts that allow fine-tuning.
Establishing proper beat is essential before attempting rate adjustment. The beat refers to the even spacing of tick-tock sounds, indicating that the escapement releases the escape wheel teeth at equal intervals. Adjusting the crutch position on the escapement arbor corrects beat problems, though this requires care to avoid excessive bending.
Temperature and humidity affect pendulum length through thermal expansion and contraction, causing seasonal rate variations. Wood pendulum rods show more pronounced changes than brass or steel rods, though all materials respond to environmental conditions to some degree.
Recording daily rate over extended periods helps identify consistent gain or loss patterns that require adjustment. Making small incremental changes to the rating nut and allowing several days between adjustments prevents overcorrection and achieves stable, accurate performance.
Professional vs. DIY Restoration Considerations
Sessions 8-day Westminster chime clocks represent significant investments in both monetary and sentimental value, making the decision between professional restoration and DIY repair an important one. Complex issues involving the chime mechanism, extensive bushing work, or mainspring replacement often benefit from professional expertise, particularly when specialized tools and experience prove necessary.
Simpler maintenance tasks like cleaning, oiling, and basic adjustments fall within the capabilities of dedicated hobbyists who invest time in learning proper techniques. Understanding the limitations of personal skill prevents inadvertent damage that complicates future repair efforts or reduces the clock's value.
Documentation throughout any restoration project proves invaluable, whether undertaken professionally or independently. Photographs, notes about component positions, and records of adjustments create reference material for future maintenance and help troubleshoot persistent problems.
The satisfaction of successfully restoring a Sessions Westminster chime clock to proper function rewards the effort invested, whether through professional services or personal labor. These timepieces continue serving their original purpose while connecting current owners to American horological heritage.
Sourcing Authentic Sessions Clock Parts
When restoration requires replacement components, finding authentic parts maintains the clock's historical integrity and ensures proper function. Original Sessions parts occasionally surface through estate sales, clock shows, and specialized dealers who stock vintage American clock components. These authentic pieces preserve the clock's value and guarantee proper fit within existing mechanisms.
Contemporary reproduction parts serve adequately when original components prove unavailable or prohibitively expensive. Quality reproductions manufactured to original specifications function reliably, though they lack the historical authenticity of period parts. Discriminating restorers carefully evaluate reproduction quality before installation, ensuring dimensional accuracy and appropriate materials.
Donor movements from incomplete or severely damaged Sessions clocks provide another source for hard-to-find components. While using parts from other clocks raises preservation questions, this approach keeps another timepiece functioning when original parts no longer exist. Ethical considerations guide decisions about harvesting parts from potentially restorable movements.
Why Choose VintageClockParts.com for Your Sessions Clock
When you're working on a Sessions 8-day Westminster chime clock, having access to authentic, photographed components makes the difference between successful restoration and frustrating compromise. At VintageClockParts.com, we've spent over 20 years building a comprehensive inventory of original Sessions clock parts, each photographed in detail so you can verify compatibility before purchasing.
Our inventory includes suspension springs specifically sized for Sessions movements, mainsprings matched to original specifications, and hard-to-find gears from the chime and strike trains. We understand the challenges of restoring these triple-train movements because we work with them regularly, and we're committed to helping you find exactly what you need without the gamble of purchasing complete donor movements hoping the parts you need aren't broken.
Every component in our collection comes from carefully dismantled original movements, ensuring authenticity and proper fit. We photograph individual parts from multiple angles, allowing you to match components visually with your existing mechanism. This approach eliminates uncertainty and saves you time and money by providing exactly the right part the first time.
Whether you need a specific gear to complete your chime train repair, a replacement mainspring to restore proper power, or bushings to eliminate excessive pivot wear, VintageClockParts.com maintains the largest selection of Sessions clock components available. Our experience with American clock manufacturers and our commitment to education means you're not just buying parts—you're gaining access to decades of horological knowledge that helps ensure your restoration succeeds.
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