US Patent: 2,138,522
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| Four-spindle drum type crankshaft lathe
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Patentees:
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| Walter R. Meyer (exact or similar names) - Cincinnati, OH |
| William F. Groene (exact or similar names) - Cincinnati, OH |
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Patent Dates:
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| Applied: |
May 16, 1936 |
| Granted: |
Nov. 29, 1938 |
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Jeff Joslin
Vintage Machinery entry for R. K. LeBlond Machine Tool Co.
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Description: |
| This multi-spindle crankshaft lathe simplifies the complete machining of crankshafts from rough forgings to finished products.Previously, (1) the machine of patent 2,030,020 was used to mill locating pads on the crankshaft webs; (2) line bearings were rough turned; (3) crankshaft was bent/straightened as needed to bring the rough-turned bearings into line; (4) rough-turned bearings were ground in preparation for mounting on an orbital lathe; (5) crank pins are turned simultaneously using the orbital lathe of patents 1,993,994 and 1,993,995; (6) flange and stub end diameters and associated surfaces were finished.This lathe implements a production process that eliminates the bending/straightening operation and the rough grinding of the main bearings. The latter goal is accomplished by incrementally performing the turning and forming operations to avoid excessive tool pressures. Their "exemplary embodiment" uses three machining steps which was faster than rough grinding. Finally, the revised production process eliminates the separate operation to finish flange and stub end diameters and associated surfaces, but rather those surfaces are finished at the same time as the line bearings are being finish turned. |
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