Rebuilt Bulleid West Country 3D CAD designed & mft in 3.5 in

[masahiraoka]

Thanks Bob your comments are much appreciated.
the Aussie holidays are over this weekend so Phil, Nigel and Andrew and I are back to work next week.
more drawings coming soon and Andrew will be shortly getting back to working on the loco itself.
ciao martyn 

[masahiraoka]

For something completely different i thought I'd load up several shots of the Durango & Sliverton Narrow Gauge (3ft) Railroad which we had the good fortune to ride in late January in what is obviously perfect weather.

the loco is a Rio Grande Class K-36 2-8-2 Mikado see en.wikipedia.org/wiki/Rio_Grande_class_K-36

this railroad runs all year through some of the most spectacular mountain terrain in south west Colorado and is an absolute must for any aficionado see www.durangotrain.com/

ciao Martyn

[masahiraoka]

Meanwhile Nigel is pressing on with the creation of the 2D drawings

here is an extract from the drawing for the engine bogie

ciao Martyn

[masahiraoka]

and here is an extract from the Trailing Truck drawing

[runner42]

I copied the drawings and pasted them into Windows paint programme, they appear to be greater than 1:1 scale, although the scale factor doesn't appear on the drawings. I assume that these are regarded as assembly drawings and beneath these are piece part drawings? Exellent clarity with the added benefit of an isometric drawing which overcomes any ambiguity often seen when only three angle projections are provided. What is the intended purpose of the drawings, are they going to be published for the benefit of other builders?

Brian

[masahiraoka]

Thanks Brian
almost all the drawings are at 1:1.5 with small compnents drawn at 1:3
and the General Arrangement and frame drawings uploaded in Sept last year are drawn at 1:1 to fit them on our standard A0 sheet.

you're correct that these are assembly drawings alongsinde detailed component drawings will in due course be avaiable to model engineers to use in conjunction with 3D printed parts avaiable for purchase
Our aim is to enable model engineers to build a high quality loco with minimal fabrication and machining.  make sure that you've looked through this blog at the other drawings i've uploaded.

ciao Martyn

[masahiraoka]

Hi all
it's been too long again since we've posted anything but work continues.
the other day we had a small Bulleid loco builders gathering down in Aus and produced this photo of bulleid West country/Merchant Navy component in three gauges: 5inch, 3 1/2 inch and 1 3/4 inch
will upload some more images of machining the centre cylinder block shortly

[masahiraoka]

and here are a couple of shots of Andrew machining the centre cylinder block

[masahiraoka]

and here is the centre cylinder drawing andrew is working to 

[masahiraoka]

and here are some photos of Andrew working on an outside cylinder





and this is the drawing he is working to

[masahiraoka]

oops,doubled up on loading the frames drawing

[masahiraoka]

Haven't posted for some time but as always work continues
this is the latest version of Nigel's Mainframes Assembly drawing  considerably updated since first posted on 19th Dec 2021.
when you examine this drawing in conjunction with the General Arrangement drawing posted on 16th Sept 2021 you realy get the sense of how the engine and particularly the chassis goes together

feel free to down load and use the these two drawings and the others

best regards Martyn

[masahiraoka]

And Phil has essentially completed the design of the tender

[masahiraoka]

and here are some shots of the Outside Cylinder Radius Rods just in from the printers

[masahiraoka]

Here is Nigel's General arrangement drawing for the tender



And here is Phil's essentially complete 3D CAD design of the loco and tender



with the 3D design now complete Nigel will focus on completing the 2D drawings and then we'll begin work again on building the physical prototype which has taken a back seat with other projects over the past six months

[44767]

That a great moment to achieve! Having a full CAD model is the start of producing everything you need. This looks like a very good model for anyone who want to build a very close to scale model using best practice and otherwise true scale techniques- just the sort of thing of which this hobby need more.

[92220]

Brilliant job, and when finished, so easy to up-scale to 5" or 7.1/4", if so desired!!!

Bob.

[masahiraoka]

Thanks Mike and Bob
its been a long journey but you’re both right, we now have an Uber detailed 3D and 2D design that can be scaled to any gauge the only real limitation being component production techniques, some are cheaper and easier at smaller scales.
Mike I look forward to visiting you sometime soon to discuss how you can help us speed up the construction of the physical prototype after which I’ve no doubt there will be some minor edits of the design.
ciao Martyn

[runner42]

Hi Martyn,

excellent work so far. I am interested to see the boiler construction drawings and where the design should comply with the applicable design codes eg AMBSC Code Part 1 et al. Additionally, the boiler feed systems what is intended? I see that an emergency water pump in the tender is provided, but what additional running systems are envisioned, injector(s) and axle pump? I note that the tender doesn't show piping arrangements for tranfer of water from the tender to locomotive, is this as in many designs left unspecified and left to the individual builder to undertake? Lastly the requirement for cylinder lubrication.

Please don't see these points as negative, just interested to see what is proposed.

Brian 

[masahiraoka]

Hi Brian,

Thankyou for your interest in the project and design. Apologies for the delay in responding but i needed to check with Phil.


The boiler is not fully detailed in the current 3D CAD model, but the outline profiles are measured and CAD modelled as near as practicable from an existing already constructed boiler which we have on hand which we will use for our specific loco build. This existing boiler is a close but not perfect replica of the full size one

The boiler overall ‘envelope’ outline must allow for thicknesses of lagging & cladding to give an appealing final outline over-all, to represent the full size locomotive proportions with pleasing aesthetics. Of course, the AMBSC (etc) statutory design & safety requirements must be satisfied within this envelope.


The boiler feed system is already detailed on the CAD model; consisting of one injector, an axle pump and a doulbe acting tender hand pump. Only minimal interconnecting pipework and fasteners are shown to minimise unnecessary complexity on the CAD model and is not prescriptive –the builder can sort these himself. The injector is below the cab right hand side/rear with the discharge pipework very conspicuous as on the prototype, and is shown right through to the boiler top feed clack as per prototype.


Cylinder lubrication is detailed in the CAD model and is by means of two (2) mechanical pumps tucked beneath the front platform, mechanically linked to each other and driven by the inside cylinder piston rod.

i'll endeavour to find and upload some photos and drawings of the various above issues

ciao Martyn