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).
Design details and manufacturing capabilities of Barber Colman Taper Splines.
| Identifier | ExFiles\Box 98\1\ scan0120 | |
| Date | 4th March 1938 | |
| To Da.{Bernard Day - Chassis Design} from HB.{C. E. Harcombe} c. to De/Hdy.{William Hardy} c. to Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} 402. GRY{Shadwell Grylls} Da{Bernard Day - Chassis Design}/HB.{C. E. Harcombe}1/N.4.3.38. Barber Colman Taper Splines. The writer interviewed Messrs. Marr and Stoddart from Barber & Colman Ltd. on the 2nd. inst. when design details of Taper Splines were discussed. They have already sent us two samples, the second being to our drawing PD.118 ( original herewith to Da{Bernard Day - Chassis Design}). This supersedes the taper splines shown on PD.91 for the Bentley 50 half floating axle, and meets Messrs. Barber & Colman's requirements. We understand that they have only one hob at present in this country. One hob will produce a range of splines having any required taper, but only within predetermined limiting root and outer diameters. It is also preferable to keep the root diameter ( i.e. the diameter at the bottom of the splines at the small end) constant to simplify setting up the machine, although it would appear to be possible to overcome this condition by a simple calculation. Although a previous drawing received from Messrs. Barber & Colman shows a tolerance of .002" on the spline width, we are assured that it is possible to work to the same tolerance as on parallel splines i.e. .001". Messrs. Barber & Colman are not in a position to broach the splines in the corresponding female piece so that we shall have to provide our own broach. There is no suitable existing broach. If it is desired to test these splines in service, apart from laboratory tests which it is understood Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} is preparing, it appears to be possible to adapt the existing Pinion Shaft and Driving Flange as fitted to 25/30 without modification to any other pieces, using the taper splines as shown on PD.118. Da{Bernard Day - Chassis Design}/HB.{C. E. Harcombe} | ||