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 leaflet for 'Peak' non-metallic pinions, detailing their material properties, benefits, and applications.
| Identifier | ExFiles\Box 136\1\ scan0307 | |
| Date | 18th October 1938 guessed | |
| SILENCE BREEDS PROFITS! 'Peak' Pinions are made from a special non-metallic material, consolidated and hardened under tremendous hydraulic pressure. They have a smooth and attractive appearance, possess great strength, toughness, and resiliency, and are practically indestructible. They are impervious to water, oil, acid, and alkali and are rodent-proof. They are unaffected by heat and can be stored for any length of time without distortion. They are supplied turned, bored, keywayed, with teeth accurately machine-cut, and finished complete ready for fitting to shaft. (Image 1 Caption: The Silent 'Peak' Pinion pursues its noiseless way, unostentatiously, unobtrusively but very effectively, enabling the Gear to work with a minimum of wear and tear) 'Peaks' for Power (Image 2 Caption: The Silent 'Peak' Pinion runs smoothly, without ring or clang, preventing vibration, and saving the wearing parts of both motor and machine) 'Peaks' for Profits Laboratory tests on 'Peak' Pinion material show the following results Tensile strength, 8000 to 10,000 lbs. per square inch. Compressive strength of approximately 40,000 lbs. per square inch, laminæ horizontal; and 25,000 lbs. per square inch, vertical. Transverse strength of approximately 23,000 lbs. per square inch, laminæ horizontal; and 25,000 lbs. per square inch, vertical. Modulus of elasticity approximately 1,550,000 lbs. on an average of ten readings. Specific gravity 1'3 to 1'4. Weight per cubic inch, '05 lb. Brinell hardness on machined part, 36'40. Co-efficient of expansion, '000017 per degree Fahr. Water absorption on test pieces one inch thick (in percentage of original weight), '46 in 24 hours, '6 in 48 hours, 1'08 in a week. When the above facts are borne in mind, it is not surprising that 'Peak' Pinions are being used with success in places and under conditions in which the use of the average non-metallic gear would be prohibitive, and in some cases 'Peaks' outlast gears of cast iron and brass. Of all the non-metallic pinions, 'Peaks' alone attain to that summit of perfection which is the desideratum of every engineer. 'Peak' Pinions give distinctive results To the positive power of an efficient gear drive, 'Peak' Pinions give a silence equal to belt transmission. This is easily accounted for by THE NATURE OF THE RAW MATERIALS. The nerve-racking rasp and rattle of metal-on-metal is stopped, thus helping to save losses through 'verbal orders misunderstood' because of din and clatter, errors or accidents due to nervous strain or exhaustion, as well as the attendant wastes of labour, materials, time, and power. THE HIGH RESILIENCY OF 'PEAK' PINIONS enables them to withstand the sudden shocks and jars to which gears are liable. Not only are they able to stand up to their own work better than other non-metallic and even metallic pinions, but by cushioning and absorbing all shock and vibration, they lengthen the life of costly mating gears, thus effecting a considerable saving in the wear and tear of bearings and other important mechanical parts. OWING TO THEIR EXTREME STRENGTH AND HARDNESS, 'Peak' Pinions are not fitted with metal flanges or shrouds, as the material does not spread under any circumstances. This particular quality of the material also gives them long life, and makes them impervious to the attacks of rodents. (Image 3 Caption: 'Peak' Pinion on countersinking machine (working in the open)) (Image 4 Caption: 'Peak' Pinion driving three mixers in large paint mill) (Image 5 Caption: 'Peak' Pinion on coal elevator) (Box 1: 'Peak' Pinions are not moulded but machine-cut with as much precision as 'Reay' metal gears) (Box 2: Countless Testimonials attest the value of 'Peaks') (Box 3: To ensure their efficient operation 'Peak' Pinions require ordinary conditions : They should never be meshed with cast or badly worn teeth, or with those of similar material; and the face of the mating cut-metal gear should be equal to or wider than that of the pinion.) (Box 4: Lubrication of 'Peak' Pinions : Although 'Peak' Pinions can be run without lubrication an application about once a month will do good. This should be in the form of a paste made with fine graphite and good machine oil, applied very lightly to the teeth of the pinion by means of a brush.) (Box 5: 'Peak' Pinions increase production and decrease expense Sole Makers The Reay Gearworks Ltd Gateshead-on-Tyne) | ||