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The bogie spring cradle plates are in production at Tyler Bros Ltd in Sutton in Ashfield. The bogie spring cradle is a compensation beam running fore and aft along each side of the bogie frame plates. The ends of the cradle sit in cups on the top of the axleboxes. The leaf spring sits inside the cradle and is upside down compared to a car leaf spring. The cradle plates would originally have been formed by pressing between formers as it is not flat being wider in the centre to accommodate first the leaf spring itself and then wider again to accommodate the spring buckle. To manufacture the cradle in the traditional way would have been very expensive. So the plates will be machined from a solid block of steel. To avoid stress and distortion in the plate, the plates are being roughly machined to size first and then heat treated to stress relieve. In the photo the first (of 4) plates has been heat treated and final machining is in progress.
The first bogie spring cradle plate in stage 2 machining. This now getting close to its final shape.