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).
Spring greasing methods, testing procedures, and failures for Toledo Woodhead Springs Ltd.
| Identifier | ExFiles\Box 154a\2\ scan0175 | |
| Date | 11th August 1939 | |
| -2- Toledo Woodhead Springs Ltd. 11.8.39. It may be necessary to punch a few holes in the inter-leaves to enable the grease to get to both rubbing surfaces. The tongues on the interleaves to hold them in position will only have to be about 2" long at the extremities. If the grease would remain effective for 10,000 miles this would satisfy us. A grease nipple would have to be fitted and suitable holes drilled to enable the top 3 grooves to be replenished. The nipple could be at the centre of the spring, feeding both ends. Grease would have to be pumped in until it flowed out at both ends. We should be glad to know what you think of this scheme and should like your co-operation to test it on your rig. The tests would be:- (1) Put a spring on your scragging machine with 2" stroke and run until the Spaldite "creaks". The spring would be run dry. (2) Fill the spring with grease and run until it again creaks. The comparison of the hours run in each case would be of considerable interest. Passing to other matters:- A Toledo spring in France has sheared the centre bolt again. This we imagine was due to inadequate damping of the spring, the centre bolt not being intended to take drive. We do not see why "Spaldite" should compress or wear in the centre so the fault probably lies in our erection. We should like to know if the pair of 7" deflection 50" springs that have just arrived have had their eyes made with tools, or not. As they are ordinary rolled eyes, they will be weak unless made with proper tools. | ||