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).
Production methods for gear tooth serrations on an RG.181 insert outer cone.
| Identifier | ExFiles\Box 136\2\ scan0165 | |
| Date | 7th February 1940 | |
| 1153 To Mr/Mills from HPS{Horace Percy Smith - Experimental Factory Mgr}/Cy c. to RM.{William Robotham - Chief Engineer} Gear Tooth Form Serrations. RG.{Mr Rowledge}181 Insert Outer Cone. This piece calls for 20 spaces of tooth form and to cut this piece on the Fellowes machine would require a special cutter to give the reduced number of teeth. Alternatively to cut with single point tool on the slotting machine would require a cutter very difficult to grind to tooth form. Should the piece become a production job broaching would be the most satisfactory method of cutting the grooves. Here again broaches and the necessary gauges made to tooth form are much more difficult to produce than vee serrated form and considerably more expensive. We do not know of any particular point in favour of tooth form serrations which warrant their adoption in preference to the vee serrations. We therefore prefer to have an ordinary vee serration which is much more economically produced. We are now in a position to cut vee serrations on the Fellowes machine with flat flanks and a slightly modified root form. The information is now being prepared in regard to the serrations which can be so cut and this will give the necessary particulars in regard to root clearances required. ---------------- HPS{Horace Percy Smith - Experimental Factory Mgr}/Cy | ||