NGG16.com

A Garratt In Miniature

What a lovely pair! February Update

A small update on progress. Both Cylinders are now at the same stage – virtaully complete! Some fittings and pipework are needed to complete the set. These might be undertaken later in the project, as they’re not necessarily needed at the moment. The valve endcaps will be primed at some point soon though…

Work has also started on figuring out where all the holes on the frames will go and a start has been made in TurboCad to plan these. Below is the buffer beam outline in TurboCad…

January Update (Just about!)

Finally got chance to progress the 16 today – but only for a good 6 hours. Unfortunately, I don’t have the luxury of a well insulated workshop and heater yet and so can only really work when the weather is warm enough! So, given how cold the weather has been, time on the project has been limited – hopefully this will get better soon (fingers crossed).

Today, I completed the drilling of one cylinder set (hooray!) and the other one isn’t too far behind now. You can see the state of the cylinders below. Machining of the piston valves, valve inspection plugs, some pipework and a few miscellaneous jobs still remain. Hopefully, the pictures speak for themselves…

November Update

Well, after a month off, i’m back at it once again! Work has started on the valve components, these include the endcaps, rod support and valve bobbins. Below is the valve rod support/endcap, with completed gland and support bushing. These are handed components, as the fixing holes are not straight to the frames, but centred to valve and main cylinder centres…

Top hat endcaps. Although not a feature of the original design, some Cockerill variants did carry them. I liked the feature and so, instead of the flat endcaps design, I decided to add them to my version…

How the components are starting to add to the look of the cylinders (and the weight!)…

October Update?

No, do not fear… i’ve not stopped work on the project, but have taken a short break during October to take care of some other things in my life. Work will commence next week to complete the major component parts of the cylinders and pictures will of course follow.

However, there will be a short hiatus over the winter, as my Hunslet needs some TLC (and a few mods) ready for next years running season.

Cheers, Chris

September Update

Well the cylinders are well on their way to completion, with some good progress made over the last few weeks. All the bronze liners are now fitted, reamed to size and each piston now turned to finished size. The end caps have finally been fitted in place, with only the stainless steel covers and cylinder glands left to fit.

The valve bores are now to size, with the next job being to make a start on the end covers and the piston valve itself. Also, a start has been made on the pipework for each cylinder and the snifting valves have been progressed. Having to drill and tap 92 x M3 threaded holes, its nice to have some other smaller jobs to fall in to, when the tapping becomes unbearable!

Snifting valves completed, ready for fitting to cylinder sides (pipework still to construct)…

Front view of cylinders with stainless steel endcaps removed…

Front view of the cylinder set , with end caps fitted…

Endcaps now fitted, stainless steel cap and piston gland still to fix. Note the dummy pressure relief stantions raising out of the tops of the cylinders – These are complete, but require etch primer…

All liners fitted and the endcaps and cylinders clamped up, aligned and ready for drilling…

Steam exhaust pipework bathing after silver soldering. The hole in the centre is access for the steam in…

How about a splash of colour!

The main steam in/out manifold plate has been soldered to the main body of the cylinders and holes for drain cocks have been drilled. This completed the major work on the cylinder lump and so the whole assembly was shipped out to Alsager Precision for some welding!  Once cleaned up and degreased a good coat of etch primer was applied to the set. The cylinders are now resting in a warm place while the etch bakes. Here’s where we’re upto…

The main steam in (threaded middle port) and steam out (outer ports). The Steam outs will be combined into one pipe…

Snifting valves

Work is underway on producing the four snifting valves for the locomotive. These sit on the outside of each cylinder (see “A week of drilling and tapping” post for a photo of their position).

Whether these will end up functional, or just dummies – i’m not sure yet – as room for the pipework is limited. If the functional route is undertaken, these will purely be a pipe outlet, with the clack hidden behind the cylinder. 5 PCD holes to drill in each, remount in lathe with end cap fitted and complete the turning of the end cap (not shown)…

Piston and Piston Rod construction

Work is well underway on the Piston and Piston Rods. All the main cylinder piston blanks have been completed, but are still needing to be turned futher and slotted to accept the O rings. This job will be completed, when the cylinder liners have been fitted to the cylinder bores. The piece on the end of the rod (to the right of pictures) is the start of the crosshead construction…

A week of drilling and tapping

After what seems like weeks of drilling and tapping, the basic cylinder structure is almost ready for welding together. I’ve a few tweaks with a file to complete the jigsaw fit before this can happen.

The images below shows the side snifting plate brackets fitted in place, as well as the numerous M3 threaded holes, ready for the cylinder lagging – now that really was tap bending fun! The brackets which will fasten the cylinder assembly to the frames has been drilled to accept the 2BA mounting bolts. These have been drilled using a jig, so that the frames can be matched up to these holes…

Sun is still shining!

It’s fair to say that the sun is keeping me from playing in the workshop. I really need to get an air con unit for these hot days! However, some small progress has been made. The rear end cap covers have now been slotted to accomodate the slide-bar bracket…

Work has also started on the crosshead assembly, with machining of the slippers completed…

Next job is back to the main cylinder assembly. Drilling the holes for the lagging, drain cocks, snifting valves etc before final welding. Once welding is completed, the cylinder sets should come together pretty quickly and easily (fingers crossed!)