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).
The testing procedure for Barker Colman taper splines on a Bentley 50.
| Identifier | ExFiles\Box 112\3\ scan0006 | |
| Date | 10th February 1938 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} c. HPS{Horace Percy Smith - Experimental Factory Mgr}/WB.{Mr Brazier/Mr Bell} 1044 850 Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer}5/AP.10.2.38 BARKER COLMAN TAPER SPLINES FOR BENTLEY 50. The application of the above splines which we wish to test is the fixing of the prop. shaft coupling to the back axle pinion shown on P.D.91. The diameter over the top of the splines is 1.200. We have discussed the tests with W.Bell and the attached sketch shows the form of test pieces which would be suitable for him whatever size D.{John DeLooze - Company Secretary} that Messrs. Barker Colman can cut should also be used for the test pieces without standard taper. The method of testing should be as follows:- (1) Assemble plain taper with standard degree of tightness and measure torque required to cause slip on taper. (02) Subject plain taper to continuous reversals of torque. The torque each way to be 75% of slipping torque. Number of reversals to cause slipping to begin to be noted and test continued for 50 hours. (3) Assemble Barber Colman taper with same degree of tightness as test (1). Measure torque required to cause slipping on taper. (4) Subject parts to same test as in 2 with same loads. Will you please make the necessary parts. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} | ||