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.
The major forthcoming event on the frames will be the machining of the hornguides on a machining station at CTL Seal. Today, we have conducted a survey of the hornguides, in conjunction with the results of the laser scanning survey, to ensure that there is sufficient material on the faces of the hornguides. The laser survey had shown up an anomaly but this was traced to the dimension of the "nest" that is used as a base for the reference sphere being omitted from survey results. Once the correct nest dimension was entered, the survey dimensions agreed with the frame drawing. We have concluded that there will be sufficent material and no further alignment changes are required. CTL Seal's next job will be to fit 29 fitted bolts per sides in a number of key location to lock the frame alignment.
Frame Plate Drilling gets Under Way
We've spent a lot of time over the last few weeks measuring and checking the frames - "measure twice, cut once"! In particular we've thoroughly checked the hornguides to make sure we have sufficient material to machine. Today we agreed with CTL Seal that the alignment was good and that drilling and bolting of the frame plates could start. Here Pete from the CTL Seal has got stuck in. A magnetic base drill is firmly clamped to the frame plates - a strop runs up to an overhead crane to help move the drill about. First, we drill out to the correct size. Then the hole is reamed out; finally a small chamfer is applied to the hole with a countersink to ensure that the bolt head sits firmly on the frame plate. The intention at this time is to install sufficient bolts to lock the alignment prior to hornguide machining. Most bolts will be fitted after machining
Bogie Frame Stays
Bogie parts continue to arrive into stock. These are the 2 bogie stays that fit at the extreme front and rear of the bogie frame. The stays were manufactured some time ago but have now recently returned from machining. We have been told that the bogie stretcher, centre slide and axle box guide castings will be delivered from the foundry in early February 2020. We are now creating the machining drawings so that they can go straight into the machining shop at CTL Seal.
It's a steady old job fitting fitted bolts to the frame plates. First we make a light chamfer on the bolt head side of the hole in the plates and then deburr the edges of the hole prior to hammering in the bolts. Here Keith and Alan are using a deburring tool to clean up one of the many holes.