Enhancements made to a tall standing timepiece support structure
In a recent project, the author of this article decided to build a custom test stand for tall case clock movements. Last year, they purchased a Scottish tall case clock and found themselves in need of a test stand, as the cost of buying one proved prohibitive.
The author has previously published articles on clock testing stands and has written about the importance of having a stable and secure stand for the precise and delicate adjustments required for clock movements. With this in mind, they embarked on a project to construct a test stand that would meet their needs.
The stand, finished with leftover Espresso paint, is a solid, stable, and attractive tall case test stand. However, after using the stand for a week, the author discovered that the movement was stopping when the weights descended to a certain level. This issue led the author to research best practices for anchoring a DIY tall case clock test stand to minimize sympathetic vibration.
Based on expertise in clock and vibration control principles, the best practices for anchoring a DIY tall case clock test stand to minimize sympathetic vibration include:
- Isolate the stand from its surrounding environment: Place the stand on a heavy, stable base such as a thick hardwood board, granite slab, or concrete block to reduce transmission of external vibrations.
- Use vibration-damping materials: Insert rubber, cork, sorbothane, or neoprene pads between the stand and the base to absorb and dissipate vibrations.
- Secure the stand firmly but without overly rigid clamping: Use bolts or screws to anchor the stand to the base, but consider adding isolation mounts or bushings to prevent rigid connections that transmit vibrations.
- Avoid reflective or resonant surfaces nearby: Position or pad the stand away from walls or furniture that could reflect vibrations and cause sympathetic resonance.
- Ensure the clock mechanism is mounted with appropriate shock absorbers or suspension: Sometimes, the clock's own mounting can help isolate it from external vibration.
- Minimize loose components and rattling parts: Tighten all fasteners and use thread-locking compounds if needed to prevent small vibrations from amplifying.
In constructing their stand, the author used premium 2 x 4's for the project, which were kiln-dried and guaranteed to be straight. The stand has two fitted removable hardwood cross pieces to support various tall case movements. The rails of the stand are made of yellow oak and do not require nailing or screwing.
One important consideration when working with tall case clocks is the English bell strike movement, which can be tricky to work on due to its complexity. As such, the ideal clock stand for servicing and testing all clock movements does not exist due to the variety of movement types and styles.
However, by following the best practices outlined above, it is possible to build a custom tall case clock test stand that is both functional and effective in minimizing sympathetic vibration. For those interested in more detailed guidance on materials and mounting techniques tailored to tall case clocks, the author encourages further research and experimentation.
The author, after building a custom tall case clock test stand from premium kiln-dried 2x4s, noticed the movement was stopping when the weights descended. To minimize sympathetic vibration, they recommend isolating the stand from its surroundings, using vibration-damping materials, securing the stand without rigid clamping, avoiding reflective surfaces, ensuring the clock mechanism is mounted with shock absorbers, and minimizing loose components. Although there might not be an ideal clock stand for all movement types, following these best practices can result in a functional and effective tall case clock test stand.
