Horological Milling Machine Bushing and Depthing Accessory

This accessory was developed based on a concept shared by longtime Sherline user and Craftsman of the Year, Jerry Kieffer. The idea is to adapt a small milling machine for multiple clock and watch repair tasks – replacing the need for several specialized tools. It simplifies and enhances depthing by letting you position a gear exactly where it needs to be, check its mesh with a mating gear, and then precisely machine the bushing hole in the correct location.

With the Sherline mill, you can precisely position and align clock and watch components, allowing for highly accurate machining of bushing holes in both size and location. Once the machining is complete, the mill can also serve as a manual press for bushing insertion.

Used in combination with your Sherline mill, this accessory transforms your setup into a versatile three-in-one clock and watch repair machine – while retaining the full functionality of a precision milling machine.

The photos show the depthing attachment on a 5400 mill. If you want to use it on a 5000-series mill you will need to add the headstock spacer block.