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).
Engineering drawing for a hammered piston ring for a relay piston.
| Identifier | ExFiles\Box 65\1\ scan0131 | |
| Date | 16th February 1926 | |
| Piston Grooves to be machined to 2.315 Dia. RING TO BE MADE SO THAT A TANGENTIAL LOAD OF 5 TO 6 LBS IS REQUIRED TO CLOSE RING TO SPECIFIED DIMENSION RADIAL LOAD = 130 TO 156LBS. IT IS IMPORTANT THAT RINGS SHOULD BE PRODUCED BY MEANS OF INTERNAL HAMMERING OR KNURLING. BORE 2.340 DIA WHEN SOLID +1/2 TURN 2.531 +3 -0 WHEN SOLID SAWCUT .025-.0 & OPEN OUT TO .250 BY INTERNAL HAMMERING OR KNURLING WHICH WILL ALLOW THE RING TO BE CIRCULAR WHEN COLLAPSED SO THAT THE DISTANCE BETWEEN ENDS IS .005 THEN GRIND OUTSIDE DIA. TO 2.500 .080 +3 -0 45° TURN .100 -.10 ROUGH GRIND .075 -.3 FINISH LAP .061 -1/2 TITLE BLOCK: DRAWN BY: W.B. CHECKED BY: S.N.D. APPROVED BY: [Signature] DATE: 16-2-26. ENGINE: 40/50 SEC.: 5120. TITLE: HAMMERED PISTON RING (RELAY PISTON) SCALE: 1/1 HEAT TREAT: NOT BRINELL: 202 241 MATERIAL: STANTON PART NUMBER: 2121 STAMP: ROLLS-ROYCE LIMITED. PRINT ROOM 17 FEB 1926 DERBY. | ||