How we Replace Bushes on Your Clock Wheels.

Introduction to Clock Bushing

If you're a clock enthusiast, you know that maintaining your timepiece is essential for its longevity and accuracy. One common restoration task is replacing the bushes on your clock wheels, also known as 'bushing a pivot.' This process involves pulling apart the clock, replacing the worn pivot hole with a brass bush, and reassembling it for optimal performance.

Step-by-Step Process to Bushing a Pivot

First, we disassemble the clock. Carefully removing the clock hands, dial, and any other external components. Once we have access to the clock wheels, we identify any worn pivot holes that needs restoring, some clocks will require between 10 to 16 or more bushes. We then identify worn bearings that have extreme amounts of wear and the job of re-centering to the original location is essential before bushing can occur. Incorrect centering can affect teeth and pinion depth of engagement so care is required to get this correct. The surface condition of the pivot is assessed and any restoration work is undertaken at this point.

Next, we select from a range of bushes available - Bergeon and KLM clock bushes give possible options that will match both the thickness of the clock plate and the pivot size. Some clock plates are unusual and trimming a bush down to get the perfect match is required. The brass bush acts as a bearing and must be a press fit into the clock plate by creating a large hole that will provide a friction fit for the new bush. We use a hand reamer to enlarge the pivot hole slightly, ensuring the closest fit to accommodate the pivot. In extreme cases a bronze bearing is used where excessive force working on a pivot is deemed to require a harder bearing surface to avoid early failure. Barrel hole wear is not uncommon and these bushes are often sweat-soldered in for added security due to their large size.

After pressing the brass bush into place, cleaning and then reassembly of the clock occurs. This step requires patience and precision to ensure that all components are correctly aligned and functioning.

The Importance of Proper Lubrication

Lubrication is usually done after reassembly, heavier pivots benefit from a mix of grease and oil. Lubrication plays a crucial role in maintaining the smooth operation of your clock. Specific oil suitable for clocks is essential for this task. We never use sewing machine oil, as it is not suitable for clock mechanisms. Clock oil is specially formulated to provide the right viscosity and lubrication for the delicate parts of your timepiece.

We apply clock oil sparingly to the pivots and other moving parts. Too much oil can attract dust and grime, causing more harm than good. A small drop of oil is usually sufficient to keep your clock running smoothly.

Conclusion

Replacing the bushes on your clock wheels is a rewarding job that can breathe new life into your timepiece. By following the steps outlined above and using the proper tools and materials, we can ensure that your clock remains accurate and functional for years to come. The key to successful clock maintenance is patience, precision, and the right kind of oil.