Front Bogie

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For most of the photos on this page, you can click the image for a larger picture.

	For our April Open Day, all of the bogie components were set out for viewing. Note how the wheels sit in wooden frames; the wheels must not touch the concrete floor.
	Ashley gets to work painting the remaining bare metal parts of the bogie wheelsets after their return from South Devon Railway Engineering.
	Bogie Spring Cradles - In common with other key components, all sharp edges must be removed as they concentrate stresses in that area. The drawing states that we need a 1/16 of an inch radius. John and Geoff get to work. Once the top surface is finished, we will need to turn the cradle over so that the other surface can be addressed.
	Liam from CTL, using a Faro Arm to check some dimensions on the axleboxes, so that we can accurately machine the liners that will be fitted to the bogie axlebox guides. The Faro arm is a portable coordinate measuring machine that can measure complex 3D objects with high accuracy and speed. The Faro arm has multiple joints that allow it to move in different directions and capture the location of a probe in 3D space. It is used for 3D inspections, CAD comparison and dimensional analysis.'
	June 2023 The bolts that fasten the bogie frame plates to the central stretcher need to have countersunk heads. This is so that the bolt head will sit flush with the frame plate and not foul the adjacent spring cradle. The countersinks in the frame plate are large - 2 inch diameter at the plate surface - and is not a job for hand drilling. So the assembly is back in the machine shop. Temporary bolts have been fitted. These will be removed one at a time and replaced immediately after the countersink is formed.
	June 2023 Here the countersink is being formed in the bogie frame plate.
	July 2023 Once the countersinks have been formed, the assembly was returned to the assembly shop. Next job is to measure the hole diameter with a Bowers gauge. We can then order the bolts.
	July 2023 Bogie Spring Cradles. Before Ashley applies the top coat of paint, John checks the torque setting of the fasteners and fits the split pins.
	July 2023 Spring cradles - painting complete
	August 2023 This is the first fit of a pair of axle box guides. John is using an internal micrometer to measure the distance between the axlebox guides. On these faces will be fitted a pair of liners. They are made of steel with a manganese steel plate welded to the surface which will face the axlebox on the wheelset. In the end, we have to create the right working clearance between these faces. The threaded bar is acting as a jack to ensure that the guides are pushed fully home against the frame plate.

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109 records found. Page 10 of 11 displayed.