Here are the diary entries for this month. You can use the forward and backward links to see the next or previous months. Most photos taken before 2018 are small size. From 2018 onwards, most photos you see below will have a link to a full size image by clicking on the photo.
Machining of the second cast steel frame stretcher started today. Here, Sam our machinist at CTL Seal starts the first pass down the side of the stretcher to determine the high spots. This face is where the main frames are bolted to it. The stretcher is upside down.
Serious Progress at CTL Seal
This week has been a good week for engineering progress. On Monday SSLC Engineering Committee representatives met the CTL Seal assembly team and John Graham, our Vehicle Acceptance Body engineer, to discuss the assembly of Hengist's frame.The SSLC team had prepared an assembly procedure document and detailed bolting diagrams. Unlike the BR Standards which used cold riveting, Hengist's frames will be assembled using fitted bolts (see Construction> Design for a fuller explanation). In the photo Geoff Turner from SSLC is explaining to John Graham, the work necessary to machine the frame stretchers.
All 3 cast steel frame stretchers are now in machining and everyone is working towards being able to show progress on the start of frame assembly at September's AGM
Machining continues on the cast steel frame stretchers. This one carries the brakeshaft. The circular lobes being machined by Lee from CTL Seal carry 2 brake shaft bearing caps which in turn carry the main brake shaft. The title is a misnomer because this component is a large lever system. It takes the vertical motion from the brake cylinder and converts it to a horizontal motion to operate the brake rodding that goes to the brake hangers operating on the driving wheels.
Front Cast Frame Stretcher
This is the front cast steel frame stretcher being machined. We are hopeful that the machining work on the stretchers is nearing completion.
Jurristi Machining Centre
The assembly process will involve loosely fitting all inter frame components and the frame extensions. We will then go through an alignment process to ensure that the frames are aligned with each other. Once the alignment is signed off, the alignment will be locked by replacing the loose fit bolts with fitted bolts. The holes for the bolts will be reamed to size and the bolts machined for a good interference fit. Once a suitable number of bolts have been fitted, the frames will be inverted and the whole frame assembly will be transferred to this Jurristi machining centre within CTL Seal. Here the hornguides for the axle boxes will be machined. In addition, the frame keeps (that sit at the bottom of the hornguides) will be machined to their location. Once machined they must only be fitted in that position.
Mike Sedgley puts the finishing touches on the smokebox door prior to the AGM