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).
Methods to eliminate hard spots in a cam and roller assembly for a steering mechanism.
| Identifier | ExFiles\Box 106\3\ scan0428 | |
| Date | 13th February 1936 | |
| - 2 - (a) Erect the cam and the roller with no pre-loading on the bearings, select the central position by finding the two hard spots on each side of the centre and fixing the central position of the roller halfway between the two. He pointed out that if pre-loading was added before this operation was tried, the pre-loading would mask the hard spots. (b) Following this the cam and the follower roller are both pre-loaded on their bearings to the agreed amount. This would, of course, result in a small amount of slack on the steering wheel in the central position, the slack not being evident except by trying the wheel when the car was stationery, but even then it would feel that you were working againt the load, the load in question being the pre-loading on the ball and roller bearings. I, therefore, arranged with Mr. Goodall that we should take one of the cams with two hard spots, fit up on the Adamant method and submit this to MX.{John H Maddocks - Chief Proving Officer} for his approval and views on the subject of the apparent slack on the central position. In addition, I pointed out to Commander Matravers that it should be possible to avoid the two hard spots which occur on the cam, by finally grinding the surface for the roller bearings on the end of the cam .005 eccentric with the cam form, the eccentricity falling between the axis of the cam and the follower roller in its central position. Apparently this would result in the hard spots moving back sufficiently far from their normal position due to the eccentricity to clear the hard spots. This operation is easily carried out as it merely means making a mandrel with eccentric centres and a keyway on the mandrel to locate the eccentricity, which would fall on the opposite side of the mandrel true axis to the keyway. Here again, Mr.Goodall is making arrangements to (Cont'd:- | ||