C2 Project News
Easter Update 2015
Update from March and Easter Working Parties 2015
March working party
The planned extended working party in March didn't go exactly to plan, as many project members had prior engagements which resulted in the working party being of normal duration; the two days over the weekend.
Much effort was put into machining work on this occasion. Chris and Andrew completed the initial milling operations on the locomotive axlebox keep plates.
Dave was joined by work colleague Phil to mill the back faces of the locomotive adjustable horn face plates. Phil soon picked up the skill of using the Wanderer milling machine, and turned out some very good work.
Once initial milling of the axlebox keep plates was finished, Andrew set up the second milling machine to work on the adjustable horn face plates. By the end of the weekend we had completed five of the eight plates; great progress!
To give himself a break from milling operations, Chris carried out a detailed survey of the tender axlebox bores. An earlier survey of these items by Clare had identified 'steps' in what should have been smooth bores. It appears that the axleboxes were bored in two operations, half from each side, and that they weren't accurately aligned between the two. Not a very good piece of manufacture!
We need a tight tolerance on the axlebox bores so that we can push roller bearings into them. Without sufficient material available to bore out the axleboxes further and then to bush them, the only practical option seems to be to make new tender axleboxes. Fortunately the axleboxes are a relatively simple design, so we hope this will not be too difficult or expensive to do.
Easter working party
The four days of Easter saw a very busy working party, with much achieved.
With the tender wheelsets complete, we think that the best place to store them out of the way would be under the tender! This has encouraged us to work towards getting the tender chassis rebuilt.
Sam worked very hard on the tender chassis. The horn guides were unbolted and removed. Then, using the oxy-acetylene cutting torch, rotten parts of the structure were removed. This included much of the remaining tank base plate and the front dragbox. Meanwhile, Paul unbolted and removed the rear drawgear, and, aided by Clare, marked out neat edges to the frame cutouts so that they can be tidied up in due course.
We have previously sketched up some ideas for fitting a spine to the tender chassis, made out of two channel sections. This will transmit most of the traction forces, and will increase the strength of the chassis significantly. Andrew fired up his laptop so that we could look at the drawings, and Paul marked out the cutouts in the chassis cross-members through which the spine will be fitted. Sam then made the necessary cuts with the oxy-acetylene torch.
The front of the tender sideframes could now be inspected, and were found to be in a poor condition (rusted right through in places). We will therefore need to replace these parts, and may take the opportunity to modify the design a little at the same time.
After all of the cutting work (which not only generates a lot of spatter but also releases a lot of rust), the opportunity was taken to move the tender frames (on our wagon) out of the shed to give them a clean down. Fortuitously, Theo and Dan turned up at that moment and were roped into the task. A good sweep of the shed floor was also carried out while the wagon was outside.
Dave machined the rear of another of the adjustable locomotive horn face plates (6 down, 2 to go). Fancying a change from horn face plates, he then machined up two tapered strips of steel which will be used to 'straighten' the locomotive front headstock.
Andrew also got to work on the second milling machine, and completed machining the rear of another adjustable locomotive horn face plates (7 down, 1 to go!).
To end the weekend, Andrew and Dave put together a list of drawings which will be required in the near future, and tried to prioritise them. With a view to getting the tender springs overhauled, a suitable drawing was added to the list.
The Russian drawings we have of the tender are far less complete than the equivalent drawings of the locomotive. We found that a number of key dimensions of the tender springs were missing, so decided to measure the springs we have. This proved that we have two different designs of tender spring, and neither match the Russian drawing! This demonstrates the need for a new drawing.