First, use a flat thin oil bottle to carefully flatten the raised part, and measure it with a vernier caliper or caliper. When the ellipticity and taper are basically eliminated, grind the large whetstone. Finally, apply some oil with a fine rag. On the journal, use a strip of cloth to pull and study until a shiny mirror appears.
It is also possible to make a simple grinding tool and use a cast iron car to make two grinding shoes. When grinding, apply a thin layer of valve sand on the journal, install a cast iron tile, and adjust the gasket and grinding tool to be able to rotate lightly and feel resistance. Then turn the grinding tool for grinding. During the grinding, the crankshaft should be turned frequently and trimmed. This will only take two or three times to eliminate out-of-roundness. Because the abrasive and the journal are in a steel contact, the abrasive only grinds the raised part of the wheel neck, the efficiency is relatively high, and the quality is better. From the practice, it is better to use the fine boring and emery cloth for grinding, and after grinding The ropes of the ropes are polished slightly, with a smoothness of up to â–³9 and a maximum out-of-roundness of less than 0
.01 mm, and the taper is also eliminated when the roundness is eliminated. For some units that do not have a large amount of repairs and have difficulty in manufacturing tools, it is also possible to directly use the connecting rod instead of the grinding tool, put the cast iron tile in the connecting rod, tighten the nut, and perform grinding, and the effect is also very good.
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