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).
Informational sheet detailing the applications of the M.D.D. Stroboscope for fault-finding and speed measurement across various industries.
| Identifier | ExFiles\Box 138\2\ scan0198 | |
| Date | 28th June 1940 guessed | |
| TWISTING FRAMES FOR NATURAL & ARTIFICIAL SILK Upon the regularity of the speed of the spindles depends good twisting. But how many factors can intervene to destroy this regularity. The necessity of our Tachometer no longer needs to be proved because more than 500 Silk Throwing Mills are using it every day. AUTOMOBILE & AVIATION INDUSTRIES A motor which gives perfect functioning of the valves, springs, cams, etc., when turned by hand may disclose surprises at 1000, 2000 or 3000 r.p.m. At these speeds the M.D.D. Stroboscope will reveal any valve bounce, retardation in the fall of the valve, spring vibrations and any defects in the passage of the chain over the sprocket. Employed without lamp the Stroboscope can determine from the ground the speed of propellers of an aeroplane in full flight. Used on the bench it will often correct fixed speed indicators driven by belts. TELEPHONES, etc. Our instruments being graduated up to 50,000 periods per minute and even more permit of the observation of the vibrations of the diaphragms, relays, etc. MACHINE TOOLS Every machine tool however slow of movement will disclose under the rays of the stroboscope undisputed characteristics and faults. An important ball bearing manufacturer had several grinding machines which made flats on the balls. On examining the grindstones through the M.D.D. Stroboscope, it was found that the passage of the belt fastener over the pulley gave a shock which in turn was transmitted to the stone and produced the flats. BALL BEARINGS On the trial bench one can observe the movement of the ball race, and the absolute speed of the balls etc. are observed. WOOD-WORKING MACHINES The high speed of these machines renders their observation by the Stroboscope particularly interesting. On examination of vertical spindles, smoothing machines, planing machines and mortising machines at work, it is easy to determine the speed of the tool and the exaggerated belt slippage that occurs. GRINDING MACHINES The constructors of grinding stones have with the M.D.D. Stroboscope a simple and portable means of measuring the speed and regularity of stones in work. ELECTRICAL CONSTRUCTIONS It would require twenty pages to describe all the possible applications in this class of work. For example, the measurement of speeds, without having need of shaft ends, without risk of indicator slippage, without slowing down low powered motors. Defective commutations can be traced nine times out of ten to a mechanical fault. Therefore, examine the brush holders and their vibrations. Again, the centrifugal controllers, speed reducers, friction pulleys, elastic couplings, or other mechanical devices will reveal unexpected details under the eye of the Stroboscope. Moreover the M.D.D. instrument can be synchronised on the alternating system thus becoming a precise instrument for measuring the frequency. The possibility of measuring instantaneous speeds is also extremely useful. For example, to determine the starting-up of a direct coupled high speed motor destined for use in conjunction with weaving looms, etc. The numerous examples above will be sufficient to give an idea of the services rendered by our apparatus in the following industries Cable Works, Gear Making Works, Constructors and Users of Sewing, Lace and Hosiery Machines, Schools, Institutes, etc., etc. Image References and Captions: M.D.D. 2508 Checking the bobbins in a Silk Throwing Mill M.D.D. 2507 Examination of valve working & passage of chain over sprocket in bright sunlight without lamp. M.D.D. 2504 M.D.D. 2505 Studying a Milling Machine at work (Stroboscope with lamp) M.D.D. 2514 REFERENCES : The Fine Cotton Spinners' & Doublers' Association Ltd., Manchester; Atlas Artificial Silk Processes Ltd., Littleborough; Taylor Lang & Co. Ltd., Stalybridge; Tweedales & Smalley (1920) Ltd., Castleton; Lees & Wrigley Ltd., Oldham; Greenhalgh & Shaw Ltd., Bolton; Courtaulds Ltd., Coventry. (3 instruments); Ford Motor Co. Ltd., Trafford Park, Manchester; John Ferguson & Co. (Manchester) Ltd. Manchester; British Insulated Cables Ltd., Helsby, nr. Warrington; Tata Ltd., London; Canadian Celanese Ltd; Dunlop Cotton Mills Ltd, Rochdale; British Bemberg Ltd., Doncaster. Demonstrations will be gladly made at manufacturers' own w[orks]. | ||