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).
Bump test for front springs, comparing the effect of different cam positions on time to failure.
| Identifier | WestWitteringFiles\M\2October1924-December1924\ Scan22 | |
| Date | 1st October 1924 guessed | |
| H.R & R BUMP TEST (FRONT SPRINGS) - EFFECT OF CAM POSITION SIDE TO SIDE RELATIONSHIP & TIME TO FAILURE EXPERIMENTAL REPORT TO S. work/HA C.B. LO OF J AG. H OF O BUMP TEST ON EACH NO 4C25X, SPRING We have carried out a test of the passing up kit at the request of Mr. Redshaw to find out what effect setting the cams 9° in relation of each other instead of at 180°, which is the standard position. Running under this condition we have broken three springs, (Woodhead design) after (a) failed after 8 mins. and 21 secs. test of spring bolt. (b) failed after 10 mins. and 35 secs. test of spring bolt. (c) failed after 2 mins. and 8 secs. of the test of spring bolt. with the cam set at 180° similar springs averaged the shortest life we have experienced is 14 mins. This shows that the springs are breaking in half the time when the cams are set at 9° of each other. During this test we measured the maximum deflection of the springs from the normal. The maximum compression was 1.88", the maximum expansion was 1.100". With the cams set at 180° the maximum compression was 1.88", the maximum rebound was 1.02", and the buffer clearance during these tests was 2". AH | ||