From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Use of a Trebel dynamic balancing machine for crankshafts.
| Identifier | ExFiles\Box 132\1\ scan0160 | |
| Date | 24th April 1940 | |
| File 116 Rm.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/JRS. Rm{William Robotham - Chief Engineer}/JRS.3/JS.{Mr Johnson's Secretary}24.4.40. DYNAMIC BALANCING MACHINE. There is a dynamic balancing machine in W. Bell's department. This machine is a Trebel and was obtained by the Chassis Experimental Department some time ago and has hardly been used. It seems to be suitable for crankshaft balancing and in order to gain first hand knowledge of its operation I had a crankshaft out of B.60. No.1 put in it. After short experience it is very simple to work and gives a direct reading of the magnitude and location of the out of balance at end each of the shaft. It is quite easy to read the out of balance to a +-oz. inch and with practice a greater accuracy would follow. With the sample crank the out of balance at No.1 journal was .5 oz. inches at 300 deg. and at No.7 journal it was 1.1 oz. inches at 84 deg. For production work a grinding wheel or drill head could be mounted on the machine without much difficulty. I suggest that we use this machine in preference to purchasing a new one, and modify it for any special conditions we might require. Rm{William Robotham - Chief Engineer}/JRS. | ||