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).
Promotional document detailing the features and benefits of 'MONIKROM' moulded camshafts.
| Identifier | ExFiles\Box 93\5\ scan0047 | |
| Date | 19th November 1937 guessed | |
| Assured Maximum CAM LIFE MORE MILES OF PROFITABLE PERFORMANCE REGULAR CAM hardness TAPPET & VALVE NOISES reduced DIE COSTS eliminated "MONIKROM" MOULDED CAMSHAFTS. In introducing the "MONIKROM" moulded camshaft to the notice of the Engine Designer and Production Engineer, we feel that here is a development which deserves careful consideration, as, undoubtedly, it is a proposition that could solve many troublesome problems. As an alternative to bar or forged material, there is no doubt that it has many great advantages, not only from the aspect of "improving the breed," but from a finished cost standpoint, whilst many items of plant layout could be either ignored or dispensed with. Amongst the vital points in favour of "MONIKROM" moulded camshafts possibly the greatest is— MAXIMUM CAM LIFE. Owing to the balanced nature of "MONIKROM" moulded material, it is ensured that there is no "picking up," either on the cam or on the foot of the tappet, besides which the cams maintain their original condition indefinitely, whereas steel cams tend to deteriorate in the course of time. CESSATION OF CAM AND TAPPET SCORING. The hardness of the tappets used in conjunction with a "MONIKROM" moulded camshaft is of much less importance than has hitherto been the case. Experiments have proved that tappets of a slightly soft nature, which have scored when using steel cams, have, after re-polishing, given every satisfaction and have maintained an excellent surface. REGULAR CAM HARDNESS. Uniform hardness of the cams is a real achievement, eliminating as it does the possibility of one soft cam in a group of eight or more cams on one shaft. "MONIKROM" moulded cams have the advantage that they can be chilled in such a manner as they become progressively harder from the back to the nose of the cam, and the chances of faulty hardness are entirely eliminated. LUBRICATION PROBLEMS MINIMISED. The material "MONIKROM" has undoubtedly good self-lubricating properties, and the kindness of the "MONIKROM" moulded camshaft to the tappet can scarcely be exaggerated. Since a damaged or roughened tappet may necessitate the stripping of an engine, the economy and service due to the consistency of this important component may be very considerable. TAPPET AND VALVE NOISES REDUCED. As has been previously pointed out, regularity of cam hardness having been obtained, and "kindness" to the tappets ensured, the inevitable consequence is that tappet and valve noises are reduced to a minimum. The wonderful wearing qualities of "MONIKROM" apply not only to cams, but also to bearings and spiral drives. DIE COSTS ELIMINATED. Dealing with first cost economy, particularly in the case of the small producer, the "MONIKROM" moulded camshaft presents a definite economic proposition as, whilst a small pattern charge has to be made, the cost of dies is eliminated or, alternatively, the excessive material costs when "hogging" out the camshaft from the bar are avoided. When the question of change of design is in contemplation, this point of course is of paramount importance. MACHINING TIMES AND COSTS CONSIDERABLY REDUCED. In considering "MONIKROM" moulded camshafts it should be remembered that whilst the cams are scientifically controlled as regards chilling, the main body of the shaft is quite easily machinable. In the case of short shafts, machining between the cams is unnecessary, and, even in long shafts, this may be avoided. The cam roughing operation is completely eliminated, and, where machining is required, a depth of cut of 0.046" (1.20 mm) is ample. The allowance usually made for cam grinding is .030" (0.75 mm). HARDENING AND STRAIGHTENING ELIMINATED. Considering that in the original manufacture of the "MONIKROM" moulded camshafts the cams are chilled, it will be readily understood that the processes of hardening and straightening are unnecessary, and the saving effected by the elimination of these operations not only from a wages standpoint but also from the aspect of maintenance and departmental overheads, is very considerable. "MONIKROM" Moulded Camshafts | ||