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The machining of the re-designed Main Rod.
After much discussion, I decided to re-design the Main Rod following the prototype. The prototype drawings were found in the "Locomotive Study Coarse" books by J. W. Harding. This series books may be hard to find, but are an invaluable source of information. Using the information in these books I generated a 3D model and finally a set of drawings. For drawing information, click here.
The new design incorporates split bearings, made from 660 bearing bronze, and adjustment wedges. The wedges press the two halves of the split bearings together. As the bearings wear, they can be moved closed together by removing some material in the center at the split, and shimming the side oppisite the wedge, and then tightening the wedge.
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