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hollywoodfoundry

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  • Location
    Garfield, Victoria, Australia
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    Many, many things

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  1. Just wanting to get Andy's attention to read a personal message from me some weeks ago.
  2. As with any new model, the best advice is to send it back for repair.
  3. Quite correct Bill, in fact they do not have any sort of bearing that can take end thrust at all.
  4. Nigel, Take a look at the section you quoted of my posting, the only 'possible' manufacturer referred to in that section was Ted. On that basis I would be quite likely to think you were referring to him. If you want an argument, take it elsewhere and off this site.
  5. The reason I do not wish to discuss my concerns here is because it will inevitably be seen as manufacturer bashing. You have already managed to misconstrue my comments about Ted Scannell's efforts, so I feel quite justified in not 'sharing' my thoughts on this forum. As far as I am aware, Ted is not a 'cottage industry supplier', and also as far as I am aware, you cannot buy any of Ted's developments at this point in time. This is not to criticise Ted's efforts, as I said, earlier they are quite admirable. However if you look at the products I produce, there is a huge range of different style drive systems, many of them quite unique. I am constantly designing new drive systems and refining the ones I have, so it should not come as a surprise that I have experimented with drive systems that are almost identical to the Railflyer ones. However I found them seriously wanting for many reasons and decided not to put them on the market. If a specialist manufacturer of drive systems has serious misgivings about a concept.......
  6. Sure, I have been following it for years, however I was replying to the post in relation to traction applications. And while Ted's efforts are admirable, where are the commercial applications, where can I buy one? I would be quite happy to discuss my issues with these drives off-line, here is not the place.
  7. Yes, I would agree about O gauge being the smallest you could go with self powered under-floor trucks. I also doubt there is much chance of these being used in trams or trolleys, as most trams and trolleys use much smaller wheels than the 11.6mm wheels used in the Railflyer bogies. They may be able to fit slightly smaller wheels, but the bulk of the motor is going to preclude fitting smaller wheels.
  8. In theory, a stepper motor could be used to drive a turntable but there are inherant problems in using stepper motors. One of the most important things to get right is very accurate indexing on the table so it finds the correct point every time. A stepper motor needs to be told exactly how many steps to make to rotate the turntable the exact amount, so this would probably be best done with a PIC chip microcontroller. But if it fails to make one step for any reason, perhaps due to something fouling the drive, then it will be out of alignment and need to be re-indexed again. It is better to employ a position sensing system to avoid this problem. In my opinion, the best method uses a small DC or stepper motor driving a huge ring gear the same diameter as the turntable with a form of position sensing to find the correct parking spot. The large gear gets close to removing any slop or backlash in the gearing system by only having one gear interface to deal with.
  9. It also concerns me that Railflyer have a lot of pictures of items on their web site that are simply 3D renderings, and others that are plainly 3D printed. There does not seem to be much evidence that indicates their products actually exist. Without going into a lot of boring detail, I played around with those motors trying to find out if they could be used in more or less the exact same situation. This was about 2 years ago, and in the end decided there were too many problems with the concept and dropped the idea.
  10. Quite true, few people realise that resin cast models are very labour intensive compared to injection moulding, and because the process causes wear on the moulds, you only get a limited number before the mould has to be re-done. There is a very successful Australian company who do injection moulded rolling stock that sell on average for around £16, but the only reason they exist and can be sold at that price is because the manufacturer cuts his own dies.
  11. These have been discussed at length on other forums, and there are a lot of questions, not the least being the price. But perhaps the biggest question is why? The bogies they are developing are all US style bogies usually only found on US models. And to produce these for a US market, where every type, variation and version of a diesel locomotive is available for little money RTR, and where almost no-one scratchbuilds diesel locomotives anymore?
  12. I am wondering if you scratchbuilt the pantograph, it looks amazingly good and well detailed.
  13. The presenter is annoying, but the method is priceless: http://www.youtube.com/watch?v=T17yLl3EAwE&feature=youtu.be
  14. I bow to your superior knowledge of the DCC requirements.
  15. And if you wish to run two or three locomotives on your DCC system? The OP did indicate he was using DCC, so if it tripped at 500mA then you would never be able to run two locomotives under load.
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