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  • Location
    Mid Wales
  • Interests
    Gauge 1 scratch building
  1. I want to build a 32 bit to 5 bit encoder using a diode matrix. I am happy with the circuit for the diode matrix - there are 32 rows with 5 columns with diodes placed at the appropriate intersections to generate a 5 bit BCD code. The code for each of the 32 rows is obtained by closing a switch to +5V. My question relates to a need to note which switches have been operated to set-up the required route for the turnouts and feeds for a z gauge model railway. I would like to place an LED against each switch which would illuminate and stay illuminated as each switch is operated - the switch is operated once and then returned to its OFF position. I need some sort of latch. I thought of a D-type such as the SN74HC373 octal latch. I have tried various connections but cannot achieve the effect that I want. Is a D-type the right sort of thing or is there something else? Eddie Price
  2. I am in the process of building a Class 47 diesel electric loco and I am looking for some suitable sprung buffers. Tenmille make a whole range of 10mm buffers but there are no diagrams. I have looked at the Detail Shots of the 47 from a 2012 posting to this forum so I have an idea what they should look like, but I can't relate them to the Tenmille descriptions. I have tried contacting Tenmille, but to date they have not responeded. I have attached an image. Can anyone identify the type of buffer? Eddie Price
  3. I am interested in using 3d printing for a z gauge loco. I am using Blender and this is the loco:- I have used Shapeways and obtained this model:- I also used the 3dHub to obtain a model printed in a light sensitive resin :-
  4. Just found this old post again. I have made some progress and am now in the middle of modelling a Churchward 43xx class 2-6-0 loco in z gauge. This is what it currently looks like. Some of the parts look a bit on the heavy side, eg. the handrail around the boiler, but when scaled down to z gauge it will hardly be visible. I still need to hollow it out to take a Marklin 2-6-0 wheel set. This is a photo of the wheel set. There are problems with the wheelset. The motor is too high as are the cylinders, and the valve motion gear is not correct for a uk style loco.
  5. I wonder if anyone is still looking at this. I have got Blender 2.67b and am interested in modelling trains. I am trying to work through Paul Hobbs' Tutorial "Building a Simple Loco". Blender is not the easiest program and at the moment I appear to be stuck trying to mirror the half chassis that I have produced. I have built the chassis, and added a buffer at either end. The next step is to use what Blender refers to as a 'Mirror Modifier' I have tried to follow the instructions in PH's tutorial, but without success. I can mirror the chassis without the buffers, but when I add the buffers it doesn't work. It is something to do with the pivot point. The 3D cursor can be moved around by right clicking the mouse button, but then there is an orange dot that I think corresponds to the origin of an object. How do I position the orange dot so that it corresponds with the 3D cursor? When I mirror the chassis both the orange dot and 3D cursor are together at the centre of the chassis, but when I add the buffers the orange dot becomes attached to the buffer and the mirroring takes place around the buffer, instead of the centre of the chassis. It's a silly problem, but I can't find a way round it. Hope someone sees this. Eddie Price ps. I have solved the problem. In 'object mode' and on the left hand toolbar there is a box marked 'origin' and this gives the option of placing the origin at the 3D cursor. Problem solved. A complete chassis with buffers in place now produced.
  6. Added a bit more detail to the roof section. Colours are a bit bright, but they do show up the various parts. There is supposed to be a pipe running from the centre rear , across the top of the SERK vents to the front, but I gave up trying to draw this in 3D. I believe there is something called 'netfabb' which is supposed to verify that the data is suitable for 3d printing.
  7. I like the cab Simon. I just could not get on with Sketchup, but the fact that it is free, perhaps I should persevere. I am using 1:32 scale. I managed to find a side elevation of a Class47 which I imported into TurboCad drawing programme. I sized the image to give me a scale 1:32. I had planed to use sheet brass, but this thread on 3D printing has got me thinking about at least trying to fabricate the roof by 3D printing. I realised that my first attempt at producing on of the circular vents can't be fabricated because the mesh is not supported. However here is another attempt. This has ben done with Geomagic Design. Unfortunately my free trial period is coming to an end, so I will have to try to import it into Sketchup. As well as doing this I am busy designing the electronics to drive the motors. I will be using 433Mhz radio control modules, plus a microprocessor in the engine to control the motors.
  8. I am in the process of making a gauge 1 class47 loco. This is the basic chassis. I had thought that I would be using brass sheet for the roof and cab, but this thread on 3D printing has got me thinking. I have tried Sketchup and while it is easy to produce some interesting shapes, I found certain operations very difficult, eg rotation and attaching one part to another. So at the moment I am trying Cubify Invent, and it is not bad. This is a first attempt at a roof vent. It looks very big, but in actual fact it should come at about 30mm in diameter. I have another couple of days before my free trial comes to an end, when I will have to decide whether to purchase or go back to Sketchup, which is free.
  9. Just been reading some of the threads on 3D printing, and it has got me thinking that it could be a way of making the roof. There is a lot of detail on the class 47 roof which would be difficult to scratch build. But it would be nice to get hold of some decent drawings. Does anyone know of a source for the class47. Up to now I have been using photographs.
  10. Making progress slowly. I now have a chassis and cab framework. There is a 6V lead acid battery in the middle. I think 6V should be enough; it would be a simple matter to change it for a 12V battery. From the motor spec. I will need about 4.8V to achieve a scale maximum speed of 80mph. I need now to complete the radio control circuitry to see if it runs.
  11. Thought you might like to see what progress I am making with my Gauge 1 model of a Class 47. To date I am part way through making the two bogies. The side frames are machined from 6mm brass. There are two electric motors to each bogie. I am in the process of making the brake lever details for each bogie - there are a lot of bits!!!
  12. Thanks Tom. Just what I need. Nice photo as well. Good view of the buffers. Eddie
  13. Hi again. Can anyone tell me what the dimensions of the buffer beam are in the Class47. This is a front view, but it is difficult to judge what happens behind the buffers. I believe the buffers are 22" in diameter. It looks as though it should be about 7' 6" wide.
  14. Yes I think you are right. Only the front box is attached by means of a pivot. For the central box the beam enters a box like structure beneath the axle box as can be seen in this photo that I found on Flikr. This is a photo of a couple of guys painting a class47 and it does show the beam entering into an opening beneath the axle box.
  15. Thanks Pugsley. Yes I can see what you mean. I found this drawing today and as you say my "suspension" beam is an equalising beam. The two outer axle boxes appear to be attached by a pivot to the equalising beam. What about the centre box? Is the beam attached in a similar manner to the centre axle box or is it attached to the frame?
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