Frame Assembly Phase 2

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

	November 2023 Weld testing of dragbox complete and waiting for a slot in the machine shop. The dragbox is upside down.
	December 2023 Machining in progress
	January 2024 Machining is complete. The pony truck centring pin has arrived; this will be bolted to the bottom of the dragbox.
	January 2024 The dragbox is back on a machine so that the holes for the pony truck centring pin can be drilled and reamed. Temporary bolts are holding the parts together prior to machining.
	January 2024 After drilling and reaming, Geoff uses an internal telescopic gauge to measure the internal diameter and check that the holes are circular.
	February 2024 This is the pony truck pivot pin, freshly manufactured by Alpenbury Engineering. Compare this with the CAD model of the pin on page 1.
	February 2024 Anthony from CTL Seal lowers the dragbox assembly into place. Temporary bolts secure dragbox and centring pin.
	March 2024 In order to check the fit of the dragbox against the back of the frame extensions, we used ratchet straps to pull it up tight.
	March 2024 The fit was not acceptable with gaps between frame and dragbox. So the dragbox was removed and John addressed the high spots. You can see the raddle that was used to identify the high spots on the right hand frame.
	April 2024 The Intermediate Rubbing Block is bolted to the back of the hind beam at the rear of the loco frames. In the original design, manganese steel liners were welded to the curved faces. We believe that this was because the liners were in direct contact with the liners on a Intermediate Rubbing Block on the tender. For the Mk3 system, the liners had to be removed and the height of the rubbing block reduced by 3/8 inch. Unsurprisingly, this has cut into some of the weld at the ends of the curved sections, so CTL Seal stopped machining. We need to weld repair this area before machining can be finished.

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30 records found. Page 3 of 3 displayed.