{"id":2577,"date":"2020-09-04T19:44:51","date_gmt":"2020-09-04T19:44:51","guid":{"rendered":"http:\/\/ngtrains-com.stackstaging.com\/blog\/?p=2577"},"modified":"2023-04-30T18:49:01","modified_gmt":"2023-04-30T18:49:01","slug":"murder-of-a-garratt-pt-2-the-resurrection","status":"publish","type":"post","link":"https:\/\/ngtrains.com\/blog\/murder-of-a-garratt-pt-2-the-resurrection\/","title":{"rendered":"Murder of a Garratt Pt 2 – The Resurrection"},"content":{"rendered":"

Murder of a Garratt Pt 2 – The Resurrection begins<\/span><\/h3>\n

W<\/strong><\/span>ell, that caused a stir with comments like \u201cyou\u2019re mad\u201d and \u201cyou\u2019d have been better off with a kit\u201d. I would refer you to my comment \u201cI wouldn\u2019t have started from here\u201d. It took me three years to pluck up the courage but once the first cut was made there was no going back.<\/p>\n

\"\"<\/a>A<\/strong><\/span>t the end of episode one I said I had plans for Sunday to get more done before the T20 cricket on the TV. It didn\u2019t quite work out like that. Some progress was made with the CAD and the M1.6 screws turned up but domestic chores and an urgent mod to a customer printed patterns were all that got fitted in around the cricket. The cricket was T20 England vs Pakistan at Old Trafford. England won and it was a cracking game.<\/p>\n

\"\"<\/a>K<\/span><\/strong>een to crack on, Monday I returned to the model room and it became apparent that most of a day off had a benefit. I realised that a) the job had expanded across all three workspaces, b) I\u2019d might a right bloody mess and c) hopefully the destruction phase is over. First job then was an epic tidy up of all three workstations. On the main bench it needed a deep clean with all the cutting disc shrapnel that had got everywhere.<\/p>\n

TOP TIP: calendar pads provide an easily replaceable work surface and notepad in one. That said, in this digital age, what was once a freebie are now harder to find.<\/span><\/em><\/p>\n

T<\/span><\/strong>idy up done today\u2019s actual priority task is the CAD for the new manifold, top feed, injectors and check valves so I can print them overnight as patterns to be sent off for casting whilst I am away. The originals on the model are a little malnourished.<\/p>\n

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I<\/span><\/strong> have 196 scanned drawings of the NGG16 but 2D is only so much help. Several parts need to be redrawn in 3D CAD which tends to reveal deficiencies in the 2D drawings.<\/p>\n

A<\/span><\/strong>llow me to try to explain with an example.<\/p>\n

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\"\"<\/a>T<\/span><\/strong>aking this first triangle. It might look like a standard 3, 4, 5 triangle but on a 2D hand drawn drawing you can write any old nonsense on it as I have or just not put anything. You can\u2019t (shouldn\u2019t anyway \u2013 ever) scale off the drawing as they have been copied that many times over the years they can be distorted in all directions.<\/p>\n

T<\/span><\/strong>his is the quality of a lot of the source material.<\/p>\n

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N<\/strong><\/span>ow, do the same in 2D CAD and you can see that its decided that one line is vertical, the other horizontal (see the little green marks) and, having dimensioned the 3 & 4 sides as what are referred to as driven dimensions, ie I said what size they were and shown in black type. The program itself has worked out the other side has to be 5 and shows that in grey and basically won’t let you mess with the truth.<\/p>\n

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I<\/span><\/strong>n 3D CAD you then add the third dimension<\/p>\n

S<\/span><\/strong>o working with those drawings and a lot of photographs that allow you to invent\u00a0 <\/del>interpret dimensions not given to get to something that looks right you end up with 3D models in CAD for the parts needed. Of course for a model we’re only interested in the outside and not the inner workings but you end up with something like this.<\/p>\n\n\n\n
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W<\/span><\/strong>ith those drawn the next thing is to print them on the 3D printer at the finest resolution as I had set myself the target of\u00a0 sending them off to be cast in brass before I left home on Wednesday.<\/p>\n

\"\"<\/a>T<\/strong><\/span>his is what the 3D printer produced.\u00a0 It took about four hours to print these and then they had to be cleaned dried and cured.<\/p>\n

A<\/span><\/strong>s 3D prints they are quite fragile and as they should be shiny brass, at least in parts, and I want to solder to them the best option was to use these as patterns to cast in brass.<\/p>\n

A<\/span><\/strong>nnoyingly the 196 drawings don’t include details of the injectors and ejector so I am looking for them whilst in Wales at Boston Lodge.<\/p>\n

RED<\/span> or BLACK, RED<\/span> or BLACK, RED<\/span> or BLACK, RED<\/span> or BLACK<\/span><\/h3>\n

A<\/strong><\/span>s supplied the loco is gloss black but with a desire for it to be red like #138.<\/p>\n

R<\/span><\/strong>ight, so even if it stayed black its going to need a lot of work. Gloss black masks all the detail in the shine so that you just can\u2019t see it. Any engine more than a couple of days out of the works exhibits all manner of shades of black and, it doesn\u2019t matter how well its cleaned grot starts to accumulate around components and that subtly changes the shade of the colours.<\/p>\n

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T<\/strong><\/span>hat\u2019s just the body colour. The model has a shiny silver smokebox. If they\u2019re ever painted silver they don\u2019t stay that way for long. Now they\u2019re painted with heat resistant black paint and often done when the engine is hot.<\/p>\n

B<\/span><\/strong>ut you were on about doing it red?<\/p>\n

S<\/strong><\/span>o, there is a cunning plan. As a one-off engine you\u2019d airbrush it and hand line it. I\u2019ve done hand lining with bow pens and have a superb set that was fettled up for me by a master of such things but to do a smart and consistent job you need to practice and you need to do it regularly. I have hand lined a couple of loco\u2019s that actually won modelling competitions but I don\u2019t really enjoy it.\"\"<\/a><\/p>\n

W<\/span><\/strong>hen I wanted my Double Fairlie Merddin Emrys painted and lined I had Warren Heywood do it and a superb job he made of it.<\/p>\n

S<\/strong><\/span>o, there is a cunning plan for which this engine is a guinea pig. Imagine, if you will, something like a range of semi kits for say, Quarry Hunslets, in which all the tricky stuff has been done and you just have to assemble it. Painting and lining is always going to be a pain in the nether regions but how about you spray it car spray black and then add its red, blue or green body colour complete with its lining as a big transfer. Its only what they do on the big railway with vinyl wraps.<\/p>\n

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T<\/strong><\/span>hat’s the theory anyway. I was somewhat dreading the practical application as thinking it through in advance made me realise that the opportunities for it to all go horribly wrong were many.<\/p>\n

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Tool Kit.<\/span><\/strong><\/h3>\n

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Here is some of the tool kit being prepared for the first attempt. With the sheet of transfers are: –<\/p>\n

\"\"<\/a>V<\/span><\/strong>ery quickly the work\/walking surfaces go generally matt and raised edges get a metallic shine just by being walked on. In the extremes you\u2019d get greasy gunge around the motion that\u2019s a smoky grey\/black with a shine to it, the tank and cab sides that have a wiped gloss finish with the start of discolouring around bolts and rivets whilst higher up and on the top of the tanks it\u2019s a more matt finish with a bit more grey in it.<\/p>\n