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posted: 27 Mar 2012 13:13 from: RedgateModels
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Bit of a beginner question here, but I'm making my first tie-bars (for a double slip) having used kit tie bars before. What is the recommended total travel of the switch, or put it a better way, how big should the gap from stock to switch rail be in the "open" position? TIA Ian |
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posted: 27 Mar 2012 13:35 from: Martin Wynne
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RedgateModels wrote:What is the recommended total travel of the switch, or put it a better way, how big should the gap from stock to switch rail be in the "open" position?Hi Ian, The prototype switch opening is 4.1/4" That scales to 2.5mm in 7mm scale, or 100 thou. That should be enough in GOG-F, or you may want to increase it to say 3mm or 120 thou just to be sure that there is a full opening all along the switch rail. The wheels should not contact the back of the open switch rail when running through a switch -- the opening should be wider than the normal flangeway gap, all the way along. regards, Martin. |
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posted: 27 Mar 2012 13:38 from: RedgateModels
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Thanks Martin, didn't think it'd take you long to get back to me ;) | ||
posted: 28 Mar 2012 21:50 from: JFS
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RedgateModels wrote:... I'm making my first tie-bars... Ian, have you read Mike Norris's article on his Preston layout in BRM 2011 Annual? I think it is about the best design I have seen in terms of simplicity and robustness and might be a good bet in 7mm as well. Good Luck! Howard. |
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