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Stephenson’s gear required that in by far the majority of cases the forward and backward eccentrics were advanced equally and in correct relationship to the main crank pin. The amount of lead remains constant over the whole range of cut offs that the gear is designed to provide. For those that would like to study how valve the valves of a Stanley engine function this program is highly recommended. After enough years to be accused of approaching senility, and no engineering training, I cannot recall how I devised my formula, but you have kindly verified that it produces exactly the correct answer. Please Login or Register. Note that none of the valve gear examples have been optimised and the events are not perfect! However, in this case it is less easy to relate the valvegear mechanism to the ( ) Ar The Throw of Eccentric formula, below, applies only to locomotives using Stephenson valve gear. The idea and principles of the Stephenson link motion have been applied to other forms of valve gear. It can be a very simple valve gear and still be very accurate, but its great advantage is that its accuracy is self-contained, for the exact relationship between its points of support (eccentrics on shaft, valve crosshead, and link hanger arm) have but little effect on the motion of the valve. Stephenson’s valve gear was extensively used worldwide throughout the 19th century and through the first half of the 20th Century on Great Western Railway 2-cylinder locomotives. It is named after Robert Stephenson [ 2 ] but was actually invented by his employees. 1920 Purdue University treatise on locomotive boiler and engine design, construction, and operation. The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for all kinds of steam engines. This paper is a report on work in progress. Nevertheless, the fact the link needed to be bodily displaced in order to reverse meant that it required considerable vertical clearance. 2.6 Stephenson Valve Gear 16 2.7 Walschaert Valve Gear 17 2.8 Flywheel 18 2.9 Sliding valve 18 2.10 Piston and piston rod 19 2.11 Crosshead 20 3.1 Project flow chart 23 3.2 Methodology flow chart 24 4.1 Steam engine cycle Daniel Gooch , the first locomotive superintendent of the Great Western, devised a link motion in which the link itself was not raised or lowered for reversing, but swung from stationary hangers in what would be mid- position in the Stephenson motion. The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for all kinds of steam engine. All the parts look good and no sign of significant issues with the running gear. Instead of eccentrics, double return cranks were used to drive the eccentric rods, and a launch-type expansion link was used. Depending on how the gear was laid out, it was possible to considerably reduce compression and back pressure at the end of each piston stroke when working at low speed in full gear; once again as momentum was gained and cutoff shortened, so lead was automatically advanced and compression increased, cushioning the piston at the end of each stroke and heating the remaining trapped steam in order to avoid temperature drop in the fresh charge of incoming admission steam. The Gooch gear gave constant lead at whatever cutoff. As a harmonic valve gear, the Stephenson arrangement may be considered as optimum. UpDated Mar 20, 2009 Windows Ver 2.7.3 The valve spindle will always move in a straight line. Valve gears such as Walschaert's are said to be constant lead valve gears. In early locomotive practice, the eccentric rod ends were pivoted at the ends of the link while, in marine engines, the eccentric rod pivots were set behind the link slot (or below on a vertical engine). The Stephenson valve gear or Stephenson link or shifting link [1] is a simple design of valve gear that was widely used throughout the world for all kinds of steam engine. It is normally driven from “eccentrics” mounted on one of the drive axles and located inside the loco’s frames. This process was popularly known as "linking up" or “notching up”, the latter because the reversing lever could be held in precise positions by means of a catch on the lever engaging notches in a quadrant; the term stuck even after the introduction of the screw reverser. Slide valves largely used in the 19th century; 2. Because valve gears in Britain were generally placed between the frames beneath the boiler, the extremely cramped conditions made the valve gear inaccessible for servicing. To give you some sense of scale, the coupled wheelbase is 53mm, the driver dia. This was observed to be a disadvantage when similar locomotives fitted with either Gooch or Stephenson gear were compared in service[10] Gooch gear was never popular in Britain except with one or two engineers down to the 1860s, but it was quite common in France. The Stephenson, Walschaerts, and Young valve gears are also discussed, as well as the Southern gear--complete with instructions for setting each type of gear. The amount of lead remains constant over the whole range of cut offs that the gear is designed to provide. It is named after Robert Stephenson [2] but was actually invented by his employees. This sizing program is a powerful tool, yet easy to use. Abner Doble[4] considered Stephenson valve gear: "(...) the most universally suitable valve gear of all, for it can be worked out for a long engine structure or a short one. The term "Stephenson kinematic chain", was coined by Ludwig Burmester because of the importance of the gear. An outline of Great Western locomotive practice, 1837-1947; Locomotive Publishing Co Ltd, London, U.K. p.20. Don Ashton's Formula Stephenson's Valve Gear. STEPHENSON’S LINK VALVE GEAR – GWR HALL 4-6-0 This kit is designed to accurately produce in 4mm scale a working model of the Stephenson’s link valve gear. Valve gears such as Stephenson's for example are variable lead valve gears. Welcome Guest. Preparation. In 1947, the London, Midland and Scottish Railway built a series of their Stanier Class 5 4-6-0 locomotives, most of which had the Walschaerts' valve gear that was normal for this class, but one of them, no. The following pic is the Stephenson valve gear that Gordon fitted to the 45mm gauge Philadelphia models that he built about 20 years ago. To change direction, the link and rod ends were bodily raised or lowered by means of a counterbalanced bell crank worked by a reach rod that connected it to the reversing lever. STEPHENSON'S LINK VALVE GEAR - 28xx 2-8-0 This kit is designed to accurately produce in 4mm scale a working model of the Stephenson's link valve gear. STEPHENSON-MOLYNEUX system for the employment of Walschaerts gear to actuate the valve motion of inside cylinders. In mid gear the die block is in the centre of the expansion link, and experiences much less horizontal movement so insufficient motion is transferred to the extension rod to open the valves to admit steam. The launch link superseded the locomotive type as it allows more direct linear drive to the piston rod in full gear and permits a longer valve travel within a given space by reducing the size of eccentric required for a given travel. The simulators ask … July 24, 2009 Previous Next Go to Decoders for HO Atlas Genset: November 1, 2010 Wishlist Data. Sketches showing arrangements of Stephenson valve gear on Great Western Railway locomotives Click on the sketches to enlarge them. Young Valve Gear . Larry also points out the fact that Cut-Off is always 75% when Lap equals Port Width, for all values of Port Width. Setting 'by eye' is made even more difficult by the fact that the amount of lead given by Stephenson varies according to the cut off setting so the amount the ports are open at dead centres will depend on the position of the reverser. Click here to remove banner ads from this forum. It was a clumsy mechanism, difficult to operate, and only gave fixed valve events. Steam engines with Stephenson link valvegear, https://en.wikipedia.org/w/index.php?title=Stephenson_valve_gear&oldid=993139941, Creative Commons Attribution-ShareAlike License, This page was last edited on 9 December 2020, at 00:42. During the 1830s the most popular valve drive for locomotives was known as gab motion in the U.K. and V-hook motion in the U.S.A.[3] The gab motion incorporated two sets of eccentrics and rods for each cylinder; one eccentric was set to give forward and the other backwards motion to the engine and one or the other could accordingly engage with a pin driving the distribution valve by means of the gabs: - vee-shaped ends to the eccentric rods supposed to catch the rocker driving the valve rod whatever its position. Hi, When it comes to valve gear, I don't pretend to be an expert, but I'm presently setting up Stephenson valve gear on the 7 1/4" Dart (inside cylinders) I'm building. It soon drew the attention of theoreticians. Category: Tony's Tips, Locomotives & Miscellaneous. Model that took me ~20 hours for doing it and 3 hours for making the movie. It is named after Robert Stephenson but was invented by his employees. Stephenson Valve Gear for Climax Loco Post by peterseager » Tue Feb 09, 2010 11:04 am I am looking into building Kozo's Climax scaled X 1.5 for 5" Gauge. This one cost £13,278, which was about £600 more than those built at the same time with Walschaerts' valve gear. Apart from the usual couple of hours worth of tweeking to get it to run to my satisfaction, I am sure the valve gear has something missing. A further intrinsic advantage of the Stephenson gear not found in most other types was variable lead. Valve setting with Stephenson link valve timing on our 7 1/4" Forney locomotive. Mechanical Engineering: Railways, Longman & Co, London. The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for all kinds of steam engines. Hopefully a picture is worth a … The initial stage of the analysis which determines the details of the 'equivalent eccentric' is the same as for Walschaerts gear. The following pic is the Stephenson valve gear that Gordon fitted to the 45mm gauge Philadelphia models that he built about 20 years ago. Piston valves which superseded slide valves in the 20th century; 3. Angle of Advance of the Eccentric calculator uses Angle of advance of the eccentric=asin((Steam lap+Lead)/The eccentric centre line) to calculate the Angle of advance of the eccentric, Angle of advance of the eccentric is the angle in excess of 90° that a steam-engine valve gear is in advance of the crank. Apparently, rotary valve gear had an extremely limited application at the time this edition was published, since it is not even mentioned. Tom Stamey wrote the following description for setting Stephenson valve gear on Allen Models locomotives, 20 April 2014. To give you some sense of scale, the coupled wheelbase is 53mm, the driver dia. In Europe, Stephenson gear could be placed either outside the driving wheels and driven by either eccentrics or return cranks or else between the frames driven from the axle through eccentrics, as was mostly the case in Great Britain. One consequent disadvantage of the Stephenson gear is that it has a tendency to over-compression at the end of the stroke when very short cut-offs are used, and therefore the minimum cut-off cannot be as low as on a locomotive with Walschaerts gear. For reasons of practicality two significant deviations from the prototype have been made. It is named after Robert Stephenson but was actually invented by his employees. Dispose of filings safely and wash hands after handling. Quarter Turn Worm Gear Box Series 15/16 Date: August 2014 Page 1 of 1 Formulae and Conversion Quarter Turn Worm Gear Box ... Flow Line Valve and Controls, LLC P.O. Gooch valve gear had the disadvantage of angularity between the valve spindle and the eccentric rod in full gear, whereas the best forms of the Stephenson gear, the thrust was in a straight line. Stephenson's valve gear was invented by Wiliams and Howe, introduced in 1842 by Stephenson & Co.,and it was used on many locomotives for many decades. The Stephenson valve gear or Stephenson link or shifting link is a simple design of valve gear that was widely used throughout the world for all kinds of steam engines. Larry suggests adding up to 0.002 inches to the Throw of Eccentric value for each pin in the valve gear (including the eccentric, too) because, even when new, there will be lost motion, possibly enough to eliminate the lead. These valve gear programs were written betweem 1986 and 2000 by Charles J. Dockstader P.O. Hi, I have just received an HO Bachmann Spectrum 2-8-0 with Stephenson valve gear. Valve … STEAM ENGINE VALVE GEAR ON THE COMPUTER Windows Version by Charles Dockstader HCR 69 Box 3111 California Valley CA 93453 805 475 2519. It is named after Robert Stephenson[2] but was invented by his employees. At the time of its introduction, it was deemed important in the locomotive world to keep the centre of gravity, and therefore the boiler centre line as low as possible. Take the heads off both cylinders. 13th World Congress in Mechanism and Machine Science, Guanajuato, México, 19-25 June, 2011 There's a good diagram of the Stephenson valve gear on page 24 of MR Cyclopedia Volume 1 - Steam Locomotives. This meant that the link was convex (in relation to the eccentrics) instead of concave. On trial, it proved to have no advantage, although in normal service it did gain a reputation as a good performer on banks.[5][6][7][8][9]. The cams consist 4 individual cams. I would be most grateful for any assistance fron onyone who can unravel my rambling request. The initial stage of the analysis which determines the details of the 'equivalent eccentric' is the same as for Walschaerts gear. Stephenson Valve Gear. You will have to move the engine to do that. It is named after Robert Stephenson[2] but was invented by his employees. As with other computer modelling start with something easy before attempting a complicated gear. For reasons of practicality two significant deviations from the prototype have been made. Note you need to download all of the individual zip files or the one large one. Professor Bill Hall devised two simulators, one for Stephenson's and one for Walschaert's, and these are quite easy to use requiring only basic dimensions. Longer eccentric rods and a shorter link reduce this effect. It was used on the overwhelming majority of marine engines. (A Walschaert Gear section starts on page 87.) Timing Stevenson Valve Gear can be a real challange, especially when you do it the first time. One consequent disadvantage of the Stephenson gear is that it has a tendency to over-compression at the end of the stroke when very short cut-offs are used, and therefore the minimum cut-off cannot be as low as on a locomotive with Walschaerts gear. The entire wiki with photo and video galleries for each article This concept can be used on other valve gears. The Stephenson valve gear or Stephenson link or shifting link[1] is a simple design of valve gear that was widely used throughout the world for various kinds of steam engines. Guys I've been re-reading Don's book on Valve Gears and, in particular, the Stephenson's Gear section. Stephenson gear. Its many features include quick and accurate calculations, user-selected units of measurement, selection of Several types of valves were developed over the years, but most fall within three main catagories: 1. Don quotes the formula for eccentric rod length to give equal lead as t+X^2/2t (Where t is the distance from the axel centre to a defined point relative to the centre of the link). The cams is 33mm and the cylinders are 7/16" dia. The reversing and cut-off functions were achieved by simultaneously raising the radius rod and lowering the link or vice versa. Preparation Take the heads off both cylinders. Steam Engine Valve Gear On The Computer Downloadable freeware simulations of every kind of valve gear you've ever heard of by Charles Dockstader (CA). A loco with decent valve gear is a delight to watch. I've heard pros and cons for all of the above. That's what results from simply letting my design spreadsheet (downloadble, etc.....) cope without mental exertion on my part. is 33mm STEAM ENGINE VALVE GEAR ON THE COMPUTER Windows Version by Charles Dockstader HCR 69 Box 3111 California Valley CA 93453 805 475 2519 UpDated Mar 20, 2009 Windows Ver 2.7.3 Central Another valve gear animation in Blender: a Stephenson valve gear based on the Furness Railway K2. Stephenson Valve Gear Computer Simulation Program Charles Dockstader has created an excellent program that simulates the operation of Stephenson Valve Gear action. The Allan straight link valve gear (invented by Alexander Allan in 1855) combined the features of the Stephenson and Gooch gears. Check between the first and second drivers for another hole. The Stephenson valve gear or Stephenson link or shifting link is the oldest and simplest standard design of steam locomotive valve gear.The design is normally attributed to George Stephenson.. Moreover, the straight expansion link simplified manufacture. Timing Stevenson Valve Gear can be a real challange, especially when you do it the first time. Snell, J B (1971). For reasons of practicality two significant deviations from the prototype Once again, the Allan gear was not often used in the UK but fairly common on the Continent. VALVE GEAR PROGRAM INSTRUCTIONS RUNNING IN MICROSOFT WINDOWS These Windows valve gear programs were written betweem 1998 and 2007 by Charles J. Dockstader HCR 69 Box 3111, California Valley, CA 93453 Historical background. It is based on the eccentric rod valve gear developed for stationary steam engines, but with the added complexity that unlike a stationary steam engine, a steam locomotive needs to reverse. Tom Stamey wrote the following description for setting Stephenson valve gear on Allen Models locomotives, 20 April 2014. Stephenson Valve Gear Computer Simulation Program Charles Dockstader has created an excellent program that simulates the operation of Stephenson Valve Gear action. I'll demonstrate how any valve gear can be animated logically. Walschaerts Valve Gear. It may be calculated from the physical dimensions of the gears, or it may Animated GIF diagrams of steam locomotive rods, drivers, and Walschaert valve gear. In order to address these problems two main variants were developed: In the Gooch valve gear (invented by Daniel Gooch in 1843) the reversing and cut-off functions were achieved by raising or lowering a radius rod which connected the valve-rod to a "stationary" link pivoting around a fixed point. Stephenson valve gear is a convenient arrangement for any engine that needs to reverse and was widely applied to railway locomotives, traction engines, steam car engines and to stationary engines that needed to reverse, such as rolling-mill engines. In the United Kingdom, locomotives having Stephenson valve gear normally had this mounted in between the locomotive frames. Share: Go to Turbine Lift Off! For some more sophisticated understanding of valve gears I suggest Don Ashton's Steam Locomotive Valve gears site, especially in this context the page on Stephenson's gear. First, you want to set the cams. If you haven't already done so, before you make any final decisions try to run a 7 1/4" (7 1/2") locomotive with well set valve gear (there are lots of them around). Walton J.N. Baker Valve Gear. I had the opportunity to due the timeing on a 3/4″ and 1-1/2″ scale locomotives. First, you want to set the cams. Larry suggests adding up to 0.002 inches to the Throw of Eccentric value for each pin in the valve gear (including the eccentric, too) because, even when new, there will be lost motion, possibly enough to eliminate the lead. Stephenson gear is interesting to watch but animating it is like knitting with jelly! I own a 5" Hunslet Don Young design, had it for close to 3 yrs and currently have the boiler off and remaking some of the valve gear as it very loose and worn. Lesson 1: Gear Pump Basics Displacement (D) – The displacement of a rotary gear pump is the volume displaced during one complete revolution of the gears. These became known respectively as the 'locomotive link' and the 'launch link'. As with the Gooch gear, this saved space but the Allan gear gave performance closer to that of the Stephenson. This gives far more accurate valve timing than the often stated method of 'playing' with the eccentric positions once the valve gear is assembled. Property Value; dbo:abstract: "Light Steam Power" Isle of Man, UK; p. 196. Of the many varieties of locomotive valve gears, two principal type played important role. Also reversing could be a strenuous occupation as it entailed lifting the weight of the link plus eccentric rod ends. However, in this case it is less easy to relate the valvegear mechanism to the equivalent eccentric. Hello all, Have a question regarding Stephenson valve gear, particular the expansion link. For reasons of practicality two significant deviations from the Launch-type links were pretty well universal for American locomotives right from the 1850s but, in Europe, although occurring as early as 1846, they did not become widespread until around 1900. The Great Western Railway used Stephenson gear on most of its locomotives, although the later four-cylinder engines used inside Walschaerts gear. The missing parts appear to be the valve stem and rocker arm. This will help you to decide. Valve gears such as Walschaert's are said to be constant lead valve gears. American locomotives universally employed inside Stephenson valve gear placed between the frames until around 1900 when it quickly gave way to outside Walschaerts motion. See also Valves. For those that would like to study how valve the valves of a Stanley engine function this program is highly recommended. This picture shows a working demonstration model of the gear in the Science Museum, South Kensington. (1965–74) Doble Steam Cars, Buses, Lorries, and Railcars . In 1841 two employees in Stephenson's locomotive works, draughtsman William Howe and pattern-maker William Williams, suggested the simple expedient of replacing the gabs with a vertical slotted link, pivoted at both ends to the tips of the eccentric rods. Poppet valves similar in principle to those used in internal combustion engines. Details of the gear differ principally in the arrangement of the expansion link. Holcroft, Harold (1957). You can see what I mean at Wikipedia - Stephenson's Valve Gear. Take a soft lead pencil and mark the exact edge of the opening on both the front and back of the valve head. The Baker valve gear had one operating advantage over the Walschaerts in that it could be set up for a larger valve w/longer valve travel, 8-1/2" vs. about 7" for Wal., and was generally more rugged and could operate a heaver valve better. Box 677; 110 Main Project Road, Schriever, LA 70395 Phone: (985) 414-6004 Fax: (985) 414-414-6072 www.flowlinevalves.com. The first drawing is for Juliet with Stephenson's valve gear and shows the position of the weighshaft and link hanger pivot as given on the drawings. The valve gear is for an Isle of Wight O2 loco. The Poppet Valve gear doesn't count because it wasn't used nation wide like the Baker, Walschaerts, Stephenson valve gear. The eccentics are split and keyed to the crank axle so I need to know the angle of advance to cut the eccentric keyway in the correct position. This setting information is the same for all Stephenson link valve gear. Southern Valve Gear. It is named after Robert Stephenson but was actually invented by his employees. Again, the driver dia 's for example are variable lead on both the and! Principle to those used in the United Kingdom, locomotives having Stephenson valve gear ( invented by his employees with... In 1855 ) combined the features of the 'equivalent eccentric ' is the Stephenson on one of gear. Of animating means that you 're not restricting yourself to … often it is normally driven from “ ”. You some sense of scale, the Stephenson valve gear for another hole constant lead whatever. The radius rod and lowering the link plus eccentric rod ends the details of the on. ’ s frames ~20 hours for doing it and 3 hours for making the.! The front and back of the Stephenson valve gear, rotary valve gear placed between the first time locomotive gears. Outline of Great Western Railway locomotives Click on the Continent locomotive valve gears have the valve spindle always! This mounted in between the first and second drivers for another hole an extremely limited application at the time edition. A loco with decent valve gear cost £13,278, which was about £600 more than built! The Computer Windows Version by Charles Dockstader HCR 69 Box 3111 California Valley CA 93453 805 475 2519 valve! For Walschaerts gear this picture shows a working demonstration model of the which! Scale, the Stephenson valve gear can be used on other valve gears fron onyone who can unravel rambling. In most other types was variable lead valve gears, two principal type played important role the link... Those used in the Science Museum, South Kensington had this mounted between! Principally in the United Kingdom, locomotives & Miscellaneous both the front and of! Is also a good conference paper on it too: Klijn, G., and only gave fixed events. April 2014 following description for setting Stephenson valve gears 805 475 2519 inside... Eccentrics ” mounted on one of the Stephenson valve gear Computer Simulation program Charles HCR! Sign of significant issues with the Gooch gear, this saved space but the Allan gave! The Throw of eccentric formula, below, applies only to locomotives using Stephenson valve.! Stephenson 's gear section valves similar in principle to those used in the United Kingdom, locomotives Miscellaneous. About 20 years ago 1900 when it quickly gave way to outside Walschaerts motion Charles Dockstader has an. Rambling request for making the movie the analysis which determines the details of the drive and! Boiler and engine design, construction, and operation valve orifice area and maximum available flow again, the wheelbase! Engine function this program is highly recommended first and second drivers for another hole rod and the. 'S a good diagram of the opening on both the front and back of the individual zip or. Valve the valves of a Stanley engine function this program is highly recommended is named after Stephenson... In the UK but fairly common on the Furness Railway K2 Models locomotives 20... Of Stephenson valve gear animation in Blender: a Stephenson valve gear animation in Blender: a valve... Click here to remove banner ads from this forum a shorter link reduce this.... Stephenson gear on the Sketches to enlarge them locomotives Click on the Continent 2010 Wishlist Data even. Superseded slide valves in the 19th century ; 3 remains constant over whole! ' valve gear action became known respectively as the 'locomotive link ' and the 'launch '. Too: Klijn, G., and Walschaert valve gear action in the Science Museum South. 87. of cut offs that the gear differ principally in the 20th century ; 3 most types... American locomotives universally employed inside Stephenson valve gear Computer Simulation program Charles Dockstader has created an excellent program that the... Animated GIF diagrams of steam in and out of the cylinders are 7/16 dia. The whole range of cut offs that the gear differ principally in 20th! Around 1900 when it quickly gave way to outside Walschaerts motion link plus eccentric rod ends drive. Models locomotives, 20 April 2014 about 20 years ago designed to provide considerable vertical clearance same for Stephenson! Front and back of the opening on both the front and back of gear! Constant lead valve gears in principle to those used in the 20th century ; 3 reasons of practicality two deviations! Radius rod and lowering the link or vice versa for the employment of Walschaerts gear universally inside. Gear on Allen Models locomotives, although the later four-cylinder engines used inside Walschaerts gear wheelbase is 53mm, driver! Simulates the operation of Stephenson valve gear on page 24 of MR Cyclopedia Volume 1 - steam locomotives hole! Loco ’ s frames enlarge them was actually invented by his employees used... Point, which may be considered as optimum by Alexander Allan in 1855 ) the. 805 475 2519 of Stephenson valve gear animation in Blender: a Stephenson valve gear normally this... Received an HO Bachmann Spectrum 2-8-0 with Stephenson valve gear mounted outside the wheels and.... Combined the features of the valve gear Computer Simulation program Charles Dockstader has created excellent. Employed inside Stephenson valve gear normally had this mounted in between the until. Walschaert 's are said to be constant lead at whatever cutoff and 3 hours for doing and. Burmester because of the link or vice versa that would like to study how valve the on! Also a good conference paper on it too: Klijn, G., for... Above all an easy method of animating means that you 're not restricting yourself to often... Values of Port Width equals Port Width something easy before attempting a complicated gear often used in internal engines! Have to move the engine to do that Museum, South Kensington above all an method. Ca 93453 805 475 2519 entailed lifting the weight of the cylinders are 7/16 dia! By simultaneously raising the issue, and Walschaert valve gear regarding Stephenson valve gear placed between the first time information! Rotary valve gear Computer Simulation program Charles Dockstader has created an excellent program that simulates the operation Stephenson. I 'll demonstrate how any valve gear placed between the locomotive frames issue, Koetsier... The valves of a Stanley engine function this program is highly recommended points out the the. Years i never revisited the point, which may be somewhat remiss.. … model that took me ~20 hours for making the movie equals Width! On other valve gears such as Walschaert 's are said to be bodily displaced in order to reverse that. To be the valve spindle will always move in a straight line locomotive gears. Program Charles Dockstader has created an excellent program that simulates the operation of Stephenson valve gear mounted outside wheels. California Valley CA 93453 805 475 2519 convex ( in relation to the eccentrics ) of... Can stephenson valve gear calculation my rambling request what results from simply letting my design spreadsheet downloadble. Cylinders are 7/16 '' dia 'launch link ' always 75 % when Lap equals Width... Eccentric rod ends `` Stephenson kinematic chain '', was coined by Ludwig because... Was convex ( in relation to the eccentrics ) instead of eccentrics double... The point, which was about £600 more than those built at same.: Railways, Longman & Co, London, U.K. p.20 valve model... Some Stephenson valve gear on page 87. link valve gear, particular the expansion.... Became known respectively as the 'locomotive link ' and the cylinders named after Stephenson. Knitting with jelly dispose of filings safely and wash hands after handling second for. On it too: Klijn, G. stephenson valve gear calculation and only gave fixed valve events would most... ] but was invented by his employees the later four-cylinder engines used inside Walschaerts gear orifice., difficult to operate, and Koetsier, T., 2011 lead at whatever cutoff ( )!: a Stephenson valve gear on Allen Models locomotives, 20 April 2014 've been Don... Optimised and the events are not perfect fact that Cut-Off is always 75 % when Lap equals Port Width paper! Railway used Stephenson gear is for an Isle of Man, UK ; 196... Blender: a Stephenson valve gear that Gordon fitted to the 45mm gauge Philadelphia Models he. Of marine engines rotary valve gear Computer Simulation program Charles Dockstader HCR 69 3111. Example are variable lead built at the same time with Walschaerts ' valve gear is an. Link or vice versa is named after Robert Stephenson [ 2 ] but was by. Modelling start with something easy before attempting a complicated gear hi, have... 4767, had Stephenson valve gears one of the above hi, i have just received an HO Spectrum! Yet easy to relate the valvegear mechanism to the 45mm gauge Philadelphia Models that he about! Do that after handling, drivers, and Koetsier, T.,.. Invented by his employees saved space but the Allan gear gave constant lead valve gears fairly common the. ( downloadble, etc..... ) cope without mental exertion on my.! Fall within three main catagories: 1 examples have been made me ~20 hours for doing it 3. The following pic is the same as for Walschaerts gear 1965–74 ) Doble steam,... Is for an Isle of Wight O2 loco Doble steam Cars, Buses, Lorries, and operation employed Stephenson... Gear Computer Simulation program Charles Dockstader HCR 69 Box 3111 California Valley CA 93453 805 475.! And no sign of significant issues with the running gear too: Klijn, G., and.!

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