A new line of tape finishing machines for the microfinishing of crankshafts with the narrowest bearing clearances has now been developed by Thielenhaus Microfinish. With the CrankStar HP (High Productivity) and the CrankStar HF (High Flexibility), one of the market leaders in the field of high-precision machine tools for surface microfinishing meets the requirements of many engine manufacturers in terms of a flexible machine solution which is suitable for smaller crankshafts. Particularly narrow finishing units with an extremely large opening angle (80°) allow, for the first time, the economic and process-safe machining of crankshafts with a mere 33 mm depth gauge, which is required by the trend towards more compact engines with higher efficiency.
Automobile manufacturers are familiar with the problems associated with the microfinishing of crankshafts. After evaluating statistics from its fleet network, a well-known truck manufacturer has ascertained that a high percentage of reported crankshaft damage is due to particularly large loads on the bearings radii. Working closely with the German high-precision machine tool manufacturer Thielenhaus Microfinish, the truck manufacturer therefore decided to perform finishing work on the bearings as well as on the transition radii.