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« on: January 16, 2021, 09:16:50 PM »
Gordon has explained matters correctly, where fitted bolts are concerned
Tapered dowels are used for the accurate relative location of mating parts which are separated clamped together by bolting. There is a separation of functions. Effectively, a fitted bolt combines the functions of location and securement.
Locomotive frames are subject to great fluctuating stresses and, accordingly, they have a tendency to crack. In general, susceptibility to cracking may be associated with welded construction. My main purpose in raising the subject of frame bolting was to ensure that there would be no danger of frame cracking from welding.
During a locomotive restoration project, now many years ago, I had the experience of partly dismantling bolted bar frames and the efficacy of the fitted bolts impressed me greatly. The bolts were tough to remove but, have no fear, they were eventually carefully replaced as the project proceeded to a successful conclusion.
In general, welding can be very successful for a multitude of applications but a necessity for post-weld heat treatment can reduce the practicability of that approach.
It is good to know that everything is well thought out and under control - as usual at the WW&F.
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