billbedford Posted February 2, 2012 Share Posted February 2, 2012 The Mousa Models websites have been updated. The main site now has a 7mm section which includes:- Wagons Non passenger coaching stock 3D printed coach parts Coach etches The 4mm section has been expanded to include:- Non passenger carriage stock 3D printed carriage parts 3D printed loco parts P4 loco wheels Small Gearboxes Mousa Models also has a shop at Shapeways where smaller 3D printed items can be purchased. Link to post Share on other sites More sharing options...
Horsetan Posted February 2, 2012 Share Posted February 2, 2012 .... P4 loco wheels ... Bill: Have put deposit on the Q1 wheels. For 3-cylinder engines such as the LMS Jubilee, will your keyed-axle system allow the wheelsets to have the correct 120-degree setting as opposed to 90 degrees? Link to post Share on other sites More sharing options...
£1.38 Posted February 2, 2012 Share Posted February 2, 2012 Bill: Have put deposit on the Q1 wheels. For 3-cylinder engines such as the LMS Jubilee, will your keyed-axle system allow the wheelsets to have the correct 120-degree setting as opposed to 90 degrees? I believe you should still quarter wheels, even if they should be at some other angle according to the prototype. Otherwise the wheels won't revolve smoothly. Edit In fact I am sure this is the case - unless you connect all the driving axles with gears. Link to post Share on other sites More sharing options...
billbedford Posted February 2, 2012 Author Share Posted February 2, 2012 Have put deposit on the Q1 wheels. For 3-cylinder engines such as the LMS Jubilee, will your keyed-axle system allow the wheelsets to have the correct 120-degree setting as opposed to 90 degrees? Thanks for the order The Jubilee wheels have their cranks set at 120deg Link to post Share on other sites More sharing options...
billbedford Posted February 2, 2012 Author Share Posted February 2, 2012 I believe you should still quarter wheels, even if they should be at some other angle according to the prototype. Otherwise the wheels won't revolve smoothly. Edit In fact I am sure this is the case - unless you connect all the driving axles with gears. Please explain Link to post Share on other sites More sharing options...
£1.38 Posted February 2, 2012 Share Posted February 2, 2012 Sorry if I was not clear. I believe that model steam locos should always have the wheels quartered at 90 degrees, so that there is an even push and pull effect through the full rotation of the wheels. This makes for much smoother running. In practice you can't see both sides of the loco at the same time, so make the model loco as efficient as possible. Link to post Share on other sites More sharing options...
Horsetan Posted February 2, 2012 Share Posted February 2, 2012 I believe you should still quarter wheels, even if they should be at some other angle according to the prototype. Otherwise the wheels won't revolve smoothly. Edit In fact I am sure this is the case - unless you connect all the driving axles with gears. Surely the smoothness of revolution will be the same even at 120 degrees? After all, it's the consistency of the setting, not the particular angle they are all set at? Link to post Share on other sites More sharing options...
£1.38 Posted February 3, 2012 Share Posted February 3, 2012 Surely the smoothness of revolution will be the same even at 120 degrees? After all, it's the consistency of the setting, not the particular angle they are all set at? It is all to do with the effieciency of the forces on the non-powered axles. The power transmission through the coupling rods is most efficient when the coupling rods are right at the top or bottom of the wheel. A push from the powered axle will give the other wheels a firm push forwards or backwards. It is least efficient when the coupling rods are at mid point. Having the quartering set at 90 degrees means that the force on one side is at its most efficient when the other side is at its least efficient. As the wheels revolve, the least efficient side becomes the most efficient and vice versa at the same rate. Make the quartering significantly different and the rate of change of efficiency becomes more lumpy. It is probably most noticeable in smaller locos - in 2mm scale, for example - but it does exist in larger locos too. I have probably explained that very badly, but I hope you get the gist of what I am trying to say. Link to post Share on other sites More sharing options...
rsv1000r Posted February 3, 2012 Share Posted February 3, 2012 The Mousa Models websites have been updated. The main site now has a 7mm section which includes:- Wagons Non passenger coaching stock 3D printed coach parts Coach etches The 4mm section has been expanded to include:- Non passenger carriage stock 3D printed carriage parts 3D printed loco parts P4 loco wheels Small Gearboxes Mousa Models also has a shop at Shapeways where smaller 3D printed items can be purchased. deposit placed for two 7mm conflat 'L's Nigel Link to post Share on other sites More sharing options...
autocoach Posted February 4, 2012 Share Posted February 4, 2012 Interested in the three link and instanta couplings. Are these really 4mm scale, if so a great service to the hobby. Link to post Share on other sites More sharing options...
Mike G Posted February 5, 2012 Share Posted February 5, 2012 Interested in the three link and instanta couplings. Are these really 4mm scale, if so a great service to the hobby. They certainly are...I saw samples at Scale4 this year, very, very tempting and beautifully crafted. Mike Link to post Share on other sites More sharing options...
Horsetan Posted February 5, 2012 Share Posted February 5, 2012 That reminds me. Bill: would this process allow you to produce some German standard steam loco wheels for P87......? I think you have my book on the Br.01 which may contain a useful drawing or two..... Link to post Share on other sites More sharing options...
billbedford Posted February 6, 2012 Author Share Posted February 6, 2012 That reminds me. Bill: would this process allow you to produce some German standard steam loco wheels for P87......? Not without having some HO axles made. Are you in the market for 200+ wheelsets? Link to post Share on other sites More sharing options...
clecklewyke Posted February 6, 2012 Share Posted February 6, 2012 Bill, I am very impressed with your work and have two questions: 1) Can objects like the couplings be made in appropriate self coloured material e.g. black, or how well does it take paint? 2) The 04 body looks wonderful. Are the handrails and pipes part of the main "moulding" (sorry - don't know of the real term for a 3D printed object) or are they separate? Ian Link to post Share on other sites More sharing options...
billbedford Posted February 6, 2012 Author Share Posted February 6, 2012 Bill, I am very impressed with your work and have two questions: 1) Can objects like the couplings be made in appropriate self coloured material e.g. black, or how well does it take paint? It will take acrylic paint very well, but for fine stuff like the couplings a permanent marker type felt tip pen work very well. I've been told that the plastic con be colour with spirit base dye as used for leather etc, but I have not yet tried this. 2) The 04 body looks wonderful. Are the handrails and pipes part of the main "moulding" (sorry - don't know of the real term for a 3D printed object) or are they separate? It comes all in one peice. As did this brake van Link to post Share on other sites More sharing options...
micklner Posted February 6, 2012 Share Posted February 6, 2012 Re Brake van does the roof come off? Otherwise how do you glaze and add weight to the body ? Link to post Share on other sites More sharing options...
robert17649 Posted February 6, 2012 Share Posted February 6, 2012 Hi Bill really impressed with loads of your things. What is the state of play with the GER Claud kit? Link to post Share on other sites More sharing options...
£1.38 Posted February 6, 2012 Share Posted February 6, 2012 It is all to do with the effieciency of the forces on the non-powered axles. The power transmission through the coupling rods is most efficient when the coupling rods are right at the top or bottom of the wheel. A push from the powered axle will give the other wheels a firm push forwards or backwards. It is least efficient when the coupling rods are at mid point. Having the quartering set at 90 degrees means that the force on one side is at its most efficient when the other side is at its least efficient. As the wheels revolve, the least efficient side becomes the most efficient and vice versa at the same rate. Make the quartering significantly different and the rate of change of efficiency becomes more lumpy. It is probably most noticeable in smaller locos - in 2mm scale, for example - but it does exist in larger locos too. I have probably explained that very badly, but I hope you get the gist of what I am trying to say. I am informed by a friend who models in 2mm scale that Jim Watt wrote an article in the 2mm Magazine and on the 2mm Forum about this 3 or 4 years ago. It confirms what I said, but explains it in a much better way, apparently. I don't have access to the article as I don't model in 2mm scale these days. Link to post Share on other sites More sharing options...
billbedford Posted February 6, 2012 Author Share Posted February 6, 2012 Re Brake van does the roof come off? Otherwise how do you glaze and add weight to the body ? The roof is fixed but the bottom is open and an etched plate, with the w-iron attached, locates on spigots under platforms. The solebars, axleboxes, springs and footboards are in single pieces. The problem with it is that it would retail at £50+ so it is not really viable as it is. Link to post Share on other sites More sharing options...
lonesome_whistle Posted February 6, 2012 Share Posted February 6, 2012 The roof is fixed but the bottom is open and an etched plate, with the w-iron attached, locates on spigots under platforms. The solebars, axleboxes, springs and footboards are in single pieces. The problem with it is that it would retail at £50+ so it is not really viable as it is. Oh, that's a bit of a shame. Do you see the costs for this kind of stuff coming down over time? Link to post Share on other sites More sharing options...
billbedford Posted February 6, 2012 Author Share Posted February 6, 2012 Do you see the costs for this kind of stuff coming down over time? Not until the patents run out........ Link to post Share on other sites More sharing options...
clecklewyke Posted February 6, 2012 Share Posted February 6, 2012 It will take acrylic paint very well, but for fine stuff like the couplings a permanent marker type felt tip pen work very well. I've been told that the plastic con be colour with spirit base dye as used for leather etc, but I have not yet tried this. It comes all in one peice. As did this brake van Thank you Bill. It's a wonderful technique but at what point does it become viable as a means of producing railway models? I presume that for our purposes the development costs will remain relatively high and that production costs of any one item will not reduce in proportion to the numbers made? So will it remain a niche technique for the next few years? I hope not - I might then not live long enough to afford it! Ian Link to post Share on other sites More sharing options...
lonesome_whistle Posted February 6, 2012 Share Posted February 6, 2012 Interestingly, I've just seen this on the BBC website. Link to post Share on other sites More sharing options...
iak Posted February 6, 2012 Share Posted February 6, 2012 Dinnae give Bill ideas please.... 8) Link to post Share on other sites More sharing options...
Horsetan Posted February 8, 2012 Share Posted February 8, 2012 Not without having some HO axles made. Are you in the market for 200+ wheelsets? *picks himself up off the floor* What would the unit cost of an axle be, according to your calculations? If you have to produce a minimum of 200, then they don't all have to be for the Br.01 or Br.03. Perhaps the same axles could be made available for use on wheels for the Br.41 2-8-2 and Br.50 2-10-0, which are also 2-cylindered and could do with some decent P87 profile wheels. Link to post Share on other sites More sharing options...
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