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sej

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Posts posted by sej

  1. Hi

    I'm presently refurbishing a rather beautiful and very old scratch-built O gauge GWR 4-4-0 loco for the widow of the builder. The prototype had 6'8" ish wheels and I could go for Slaters as it needs a new (non-running chassis) but I believe a set of coarse scale wheels would be a much better fit. Does anyone know of a source of something that might do?

     

    Cheers

    Simon

  2. On 09/10/2019 at 13:16, CF MRC said:

    The GNR N2 failed to proceed on Copenhagen Fields at Fareham last weekend. It was made by the great Denys Brownlee and has run for 30 years, probably covering many hundred of real miles in that time.  

    962DB80B-F26C-454C-8ED3-21ABC5BE308D.jpeg.5dd50efb137696b1201cb9b842adcf85.jpeg

    It is very rare for me to have two engines on the go at once, but I thought this deserved a ‘12 hour chassis’ - so it jumped the queue. 

     

    On examination, I found that the 1/16” axles were worn by 0.1mm. 

    D1833277-6250-4B06-B934-5828151336C1.jpeg.f0af9b8541863bf8d57fc2f4693d2b5c.jpeg

    They were put in a step collet and have been re-profiled to 1.5 mm diameter. 

    D829B7BD-AFF8-4A21-BCDE-ECBB0928A82D.jpeg.fc6ba40ee886c5b13d8deeac464b9102.jpeg

    A3FD6382-18B9-4730-BF8D-7435F4138A66.jpeg.e58a0e55b64f563d1e82b5d96199b6d9.jpeg

    On looking closer I also noted significant wear on the coupling rod pins.  Denys had used remarkably thin  (for him) steel for the rods and it had ‘cut in’.  The new rods will be made twice as thick. 

     

    The chassis has been made with brass frames and tapped acetal spacer blocks.  The frames were separated from the blocks and one sweated to two pieces of brass to act as a pattern for the replacement chassis. 

    75C6A607-AF31-46B8-878C-E2FFDE00CAAC.jpeg.a0fcfc004bf7620d84c6d50dc57b2b94.jpeg

     

    The old holes were located using an equivalent size drill upside down as a plug fit in the drill press, with the frames held accurately in a vice on the X - Y table of my mill - drill.  Once the location was correct, the drill was used correct way up to make the hole.   The axle holes were drilled by dead reckoning, using the table to set the coupled wheelbase (the rods will be made the same way). 

    87D4E51F-B0E1-4E90-B70D-EBAE95847B10.jpeg.251408ae6b66c4b996ebb7c6f0c648e4.jpeg

    Once all the holes were made, the new chassis was filed up to shape using the old one as a pattern: the image shows the three pieces still sweated together. 

    C87D5293-E72F-473A-A4F7-8305F0D4737D.jpeg.7c6880c2b2ab09b98129c6e5e1def93f.jpeg

    I am fairly confident that I will be able to re-use some of Denys’ acetal spacers.  It would be appropriate to keep as much of the original as possible. 

     

    Tim

     

     

     

    Thanks for that Tim, I've always wondered how to exactly position drills into pre-existing holes...and there you go!

    Cheers

    Simon

     

  3. Thanks Dave, that's great.

    I've recently been allowed to play on a pantograph engraved and  can agree that making a video would definately require another pair of hands! Here's the result.1291802592_P1110598(1024x536).jpg.1c2ef5cb7cd33f1e4469cd3e11e933e1.jpg

    The frames are for a 4mm Hull and Barnsley 0-4-2 H1 tender loco. We used some rather ordinary brass sheet which did result in breaking a cutter, partly due to my inexperience. Do you always use hard cartridge brass?

     

    Cheers

    Simon

     

    • Like 3
  4. Hi;

    For my scratch-built 7mm 4-4-2 LTSR Tilbury tank I'd like to add DCC sound. Other than revving up "Thundersley" at Bressingham I wonder if anyone has any suggestions for something that might sound like one?

    They had a pair of outside cylinders and were apparently originally designed by Mr Adams of the LSWR, so an Adam's Radial might do? The LMS and BR fiddled and tinkered with them; mine is to be in BR ownership with an extended smokebox and possibly LMS/BR whistle so perhaps a more modern tank loco?

     

    Looking forward to your thoughts.

     

    Cheers

    Simon

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