Build Diary entries for May 2020

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.

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Bogie Frame Keeps
04/05/2020
	More parts into stock this week. Here we have 4 bogie frame keeps. These will be fitted to the bottom of the bogie frame plates underneath the axle boxes.
Bogie Stretcher Machining (3)
11/05/2020
	Work continues on the bogie central stretcher casting. You can see that the side arms have been machined. The bogie frame plates will be bolted to these faces. Machining has started on the top faces.
Valve Cylinder Pattern - Second half
17/05/2020
	Tony, our cylinder pattern maker, reports that he has finished making up the layers of the second half of the valve cylinder pattern. These are glued and screwed together one layer at a time, giving plenty of time for the glue to set. It's a slow job. Once the glue has set, the screws are removed and replaced by wooden dowels. Here you can see the 2 halves of the second half on the bench. Tony's next job will be to power plane the pattern down to the blue line before they go on the lathe.
Bottom of Frame Plate Machining (1)
20/05/2020
	We haven't been 100% satisfied with the way that the frames are sitting on the cast steel stretchers. So we've taken the decision to lightly machine the bottom face of the frame plates, taking the minimum material off to ensure the surface is flat and square to the side of the plate. The corresponding face on the cast steel stretchers has already been machined. As CTL Seal are busy, the frame machining has been undertaken by Pattinson Brothers Engineering of Sheffield. Here you can see the assembly being set up on the machine. Some bobbins have been made up and fitted in the holes for the stretchers; these are used as reference points. If you look closely at the full size image (click on the image), you can see a dial gauge taking a measurement from the bobbin.
Bottom of Frame Plate Machining (2)
20/05/2020
	A view from the other side of the frames at Pattinson Brothers Engineering
Bogie Stretcher Machining (4)
25/05/2020
	The bogie stretcher has completed the first phase of machining. Here is Karl in CTL inspection checking the dimensions with a Faro Arm (a portable coordinate measuring machine). The next stage is on an NC machine where the bolster pad seating surfaces will be machined.
Bogie Centre Slide
25/05/2020
	Also being machined is the bogie centre slide. The bogie pivot - fixed to a bogie pivot stretcher on the main frames - engages in a bush in the centre slide. The centre slide is able to move left and right while being constrained by the side control springs
Bogie Side Control Beams (2)
26/05/2020
	The sideways motion of the centre slide on the bogie stretcher is transmitted to the side control springs via these 2 beams, one fore and one aft of the centreline of the bogie. They are now almost finished and just need small radiused corners on the end of the beams.