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).
Blueprint for a right-hand cam with 3 1/4 turns.
| Identifier | ExFiles\Box 28\2\ Scan058 | |
| Date | 26th August 1930 | |
| GRINDING ADDED TO CONE FOR ROLLER RACE 1.7.31, ALTERATION, Location, Date, Initial, 4.1875"±.004", CUT TRACK RIGHT THRO, 1/32 R, 2.093"±.002" TO GAUGE, 1.6875" DIA +.00025 -.00075 TO GAUGE, FOR 1/32 DEEP, 1.406" DIA +.001", 1.125" DIA, 19/32", BREAK CORNERS, 1.875" DIA +.004", .703" +.001", .406"±.005", 2", 2.5312" RAD ±.005", 4 13/16" OVERALL, NOTE PARTICULARLY THE CENTRE FROM WHICH THIS RADIUS IS TAKEN, ¢ OF CUTTER, R7 TO BE STAMPED ON AFTER OP 1, TO GAUGE BOTH ENDS, TO ¢ OF CAM, 1/16 R, 1/32 R, 100°, 30°, 1/8 R, 1/16 DIA, 1.125" DIA +.010", 3.0" DIA +.010", 3.4687"±.005", 3.5625"±.005", SECTION OF CAM AT ENDS, 4 TIMES FULL SIZE, 1.6875" TO GAUGE, 1.6515" DIA ±.002", 1.406" DIA, .125"±.001", 1.125" DIA +.0025" -.0000" TO BE BROACH, .625"±.002", KEYWAY AND SERRATIONS, 4 TIMES FULL SIZE, 67 1/2°, 22 1/2°, 90°, .14"±.005", CAM PROFILE, .25"±.002", 20°±1/2°, TO BE CASEHARDENED, DEPTH OF CASE TO BE 1/32", SCLEROSCOPE TEST 88-95, 1170° CIRCULAR MOVEMENT RH{R. Hollingworth}, 65° ANGULAR MOVEMENT, CAM CUT RIGHT THRO AT ENDS, All Dimensions not Limited to be ±.010", To be Machined where Marked ff, Extra Fine Finish where Marked fff, SCALE:-, ADAMANT ENGINEERING CO. LTD, LUTON., CAM 3 1/4 TURNS RH.{R. Hollingworth}, TYPE R7, MATERIAL NICKEL CHROME CASEHARDENING STEEL, No. Off per Set 1, Machined all Over Water Ground where marked WG{Mr Gill - Financial Director}, Traced, Checked, Appvd., Date 26-8-30, P2275 | ||