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).
Letter to Ferodo Ltd. regarding difficulties in riveting a VG.90 friction ring and servo driven plate.
| Identifier | ExFiles\Box 152\2\ scan0246 | |
| Date | 15th February 1939 | |
| 1294? Rm{William Robotham - Chief Engineer}/JBD{John B. Dixon - Fuel Systems} 22/ER 15th February, 1939. Ferodo Ltd., Chapel-en-le-Frith. For the attention of Mr Shelton. Dear Sir, We are sending you one VG.90 Friction Ring and Servo driven plate. We have had difficulty in rivetting the Vr.{E. S. Voller - Orders}90 material on to the disc, and in several cases, the material has split, either when rivetted or after running. There is no centrifugal loading on the ring, and we are of the opinion that the trouble is mainly due to bad rivetting technique, which has become serious now that we are using this tender material. We should be much obliged if you would rivet the VG 90 on to the plate on side marked, and return for my attention. We will leave the spacing, counter boring, and size of the rivets and holes to your judgement. The holes already drilled are those we have been using, but can be disregarded, and for your information, we have been counterboring to leave .050" material under the rivet head, using a copper rivet. In other respects, the VR.{E. S. Voller - Orders}90 seems promising and bears out the speed characteristic theory, and does not squeak until at a temperature of about 260°C when there was a slight squeak, but we have no data as yet at high temperatures. We hope the chronograph and solenoid you collected on your last visit, are satisfactory, and will fit in easily to your test rig. Yours faithfully, | ||