The 762 Club - LYNformation Bulletins
Aware that much development has been going on in the background, but little has been seen in public, and also that the pace of development is gradually increasing, the 762 Club introduced this on-line update feature in early 2013. This page, updated around once a month, will provide brief news snippets, images and general "Lynformation" on our progress. Please come back regularly for the latest updates.
(just hover your mouse over images to see captions, click to see a larger version where available):
See the current and archived versions of LYNformation here:
LYNformation Bulletin No.48: January 2017
A huge chunk of good news, together with a few reversals this month.
First, the bad news. We will not make our 13th May opening.
After the euphoria of putting the engine together on the 23rd November, a number of important issues were discovered. None too disastrous but when added up, meant about six weeks of extra work.
The problems were:
We are sorry that we have had to put back our launch, but better to let everyone know as soon as possible.
Reach Rod Assembly. We knew this would require new apertures cut in the cab but sadly the path of the rod also fouls the inside of the right hand tank.
We always knew that space would be at a premium in this (and other) parts of the engine, but there is no way round cutting an insert into the tank and welding it up. Richard Kempton will get onto this straight away in the New Year when he starts again on the 9th but it will take a couple of weeks.
Boiler/Saddle Interface. The boiler does not fit snugly on the saddle. Due to a combination of issues, the boiler sits on some high points on the saddle rather than on the broad sweep of the radius. The upshot of this means that there are gaps of up to 10mm between the smokebox and saddle. There needs to be a good seal between these components and 10mm is far too much just to 'fill'. It will be necessary to 'smooth' the saddle to allow the boiler to sit down more.
The good news is that this will lower the boiler by about 10mm which helps at the back end and also makes the tanks fit far more evenly. The bad news is that this will add a further two weeks to the job.
Spring Assembly Grease Nipples. There is a need to get lubrication into the spring assembles and grease nipples were selected to keep the engine tidier and requiring less oil splashing around too much. Unfortunately, in order to get a grease gun to them, the tanks are in the way. There are two on each side that are in the way and so we have had to create recesses in the tanks to allow the nipples to be greased.
Now onto the good news stuff!
1. LYN's Lead Mine
We are really pleased to report that we now have enough lead to fill the weight containers and have a little bit over! This means that between the members and supporters of LYN, an amazing 400 kilos of lead has been donated, and we have reached our target before we need to start melting the lead.
Thank you all for your huge generosity. A good job, well done! LYN's lead mine is now CLOSED!
2. Cab Equipment
We are now working on some of the tools for LYN and have acquired the oil pots and feeder. These were made for us by the Hetherington Lamp Company.
Whilst the engine was partly assembled, the opportunity was taken to trial fit much of the smokebox.
As the image shows, the blast pipe and spark arrestors were successfully fitted and when the time comes, we know that these major components can just be slotted in.
4. Left Hand Tank
When the left hand tank was first fitted, the basic fit was good and only a few mounting location positions needed correcting. However, as previously reported, there was not enough space between the tanks and the grease nipples on the spring assemblies. This meant that small pockets had to be
inserted into the tanks to provide access to the grease gun.
Here you can see these pockets completed.
5. Backhead cladding
All of the cladding has now been completed and delivered. One of the most critical pieces is the complex backhead cladding piece. Here is an image of it being trial fitted. Sadly, some of the cut outs do not line up, but the radius of the curve over the firebox is nice and smooth.
Richard Kempton has calculated the valve layout needed for the manifold, and also pictured in his mind where the pipe runs will be. Now that this important step has been taken, a mock-up was made in wood to illustrate the position, size and proportions of the manifold. Here is a photograph of what it looks like in rough wood.
Now a drawing will be made by Ian Gaylor and then fabricated by Andy Bennett.
7. Cross Head Slippers
The final process in making the crossheads was the machining and fitting of the crosshead slipper plates prior to them being white metalled. This will take place early in the new year when the outside motion is assembled. We now have all of the parts and this section of the assembly is being undertaken by the team at Alan Keef.
8. Cylinder Cladding 1
Opportunity was made in early December to roughly trial fit the complex cylinder cladding. It showed up some issues that will need correctly when the final fitting is started, but to show members what it will look like, I have added three images.
9. Boiler Cladding
We have not fitted the boiler cladding yet, but as the images show, it is all in close proximity and ready to go on.
10. Cylinder Cladding 2
Just before the Christmas break, Richard had an hour or two spare, and before getting stuck into the right hand tank modifications, he took the opportunity of starting work on the cylinder cladding. He will use this job as a bit of a fill in, but here you can see the first more or less finished cladding in place. We are going to have to design some 'stand-offs' to lift the cladding away from the cylinder fabrication as currently the cladding is unsupported in key places.
11. Side Tank Braces
As you can see from the images, these have been fitted, modified, and are now complete. Both tanks also are lined up, shimmed to get the correct height, and all of the fitting brackets line up perfectly. The gap between the tanks and boiler is also perfect once the boiler is lowered by 10mm when the saddle is ground smooth.
12. Lubrication Mounting
Where to place the mechanical lubricator was always going to be an interesting conundrum. We need to get a drive from the motion to operate it but it is pretty big. Eventually, a solution to mount it under the boiler has been agreed. It is still not without its problems, the biggest of which is that we will have to get the manufacture (Couthards of Carlisle) to reverse the drive mechanism, but at least a workable and relatively discrete position has been found.
That is about all for now. We are working on a spreadsheet that will pinpoint the exact chronology of the final assembly, and if I can get agreement to share it with our members, then we will publish it. In the meantime, expect the next edition of LYNformation to be a bumper one!
Thanks for all your continued and fantastic support.
Happy New Year! 2017 will be a great year for LYN fans.
See the current and archived versions of LYNformation here:
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