kipford
Statesman
Building a Don Young 5" Gauge Aspinall Class 27
Posts: 566
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Post by kipford on Dec 16, 2023 19:31:21 GMT
Wilf not worried about expansion. Estimate on the expansion of the boiler is only about 6 thou so If it gets tight in the frames then so be it. The stiffness of the mid frame stretcher and the drag box will just put the boiler locally into compression which will not be a problem stress wise. Dave
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jma1009
Elder Statesman
Posts: 5,901
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Post by jma1009 on Dec 16, 2023 22:37:44 GMT
Hi Dave,
Looks to be a very nice job, but I would agree with Wilf that the boiler is a bit tight in the frames. The top horizontal stretcher behind the firebox can be relieved with advantage before painting it.
Cheers, Julian
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kipford
Statesman
Building a Don Young 5" Gauge Aspinall Class 27
Posts: 566
|
Post by kipford on Dec 17, 2023 9:46:09 GMT
Julian The boiler is tight to the side frames, relieving the stretchers does nothing for you as it is well clear of them. If the boiler does tighten up in the frames then we are looking at a compressive stress of around 64 Kpa which is insignificant against a tensile strength of around 40 MPa. Dave
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