Foundry practices, investigation of bushes, and the machining process for bearings.
| Identifier | ExFiles\Box 115\5\ scan0179 | |
| Date | 14th November 1938 guessed | |
| -5- with Foundry practice, which is affecting anything we are doing, and the position now is to proceed as fast as possible with the investigation of the bushes we have brought back, both as regards analysis and heat treatment, and this to be followed up by a discussion at H.D.A. on Tuesday next, the 22nd. In looking at the bearings fitted up in crank-cases in their shops, the first bearing we examined had two blow-holes in it, which would be more than sufficient to scrap it from our point of view, and this again would rather emphasize the point that Rolls are not working to the same standard as we are here. In the machining of bearings at Rolls, they, of course, are working off the bush and not the half bearing. They leave a ring type runner on the bush and hold on to this during the machining operation. They then run a saw cut 1/16" wide down each side of the bearing, and finally split it in two complete halves with a very thin saw, and where the thick 1/16" saw has been run down the bearing, half-way through the radial thickness, this forms the location in addition to the dowel pin, so that by the use of two shims between the half bearings they thus prevent the bearing from turning round in its housing. This is a point which must be taken up with Mr. Robotham, as we saw this after we had left him, as on a fairly heavily loaded bearing, if it is of rather thin radial section, it may be important | ||
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).