Highland Railway Drummond 6 wheel coach

Hi, and firstly an apology for being AWOL for so long.

Over the last 18 to 24 months I've been fully occupied with Scottish Wagon Works and family issues.
John (also of SWW) pointed out that over the last while, although I've been busy I have very little to show for it (there are many folks who have our kits for which we are very grateful for their support), I've just not had the time to build them for me. Something John has vowed will change this year.

So this one one is a personal project, HR Drummond 6 wheel coaches.

Three variations Dia 22 6 compartment full 3rd. and Dia 23 Composites (with and without luggage compartment).

Initially built with panelled sides later versions were matchboard. I'm starting with the matchboard versions.

Couple of issues to deal with, these are too big for my Saturn 4 ultra printers to be printed in one piece. They will fit on the Anycubic 3 Max, but it is currently mothballed as the Sat4's print far quicker with finer detail, Elegoo have been threatening a new version of the Jupiter (Max 3 equivalent) with a higher resolution screen for over a year. The next issue is the wheels / suspention. The wheel base is long 23ft between the front and rear axles, and the middle axle will need to be able to move side to side to allow for cornering. My normal method of 3D printing the axle guards will not be able to accommodate the movement. For a test I've purchased a set of Slaters and Connoisseur 6 wheel etchings.

I will be making the seats as drop-in sections so that the interiors can be painted, and painted seated sections complete with figures can be added after. Also compartment lighting to be fitted as well.

That should be enough to complicate things to start with.

Dia 22 6 compartment 3rd

I started by sketching a 3rd class section in Fusion


Then added the ends



And the fun begins - extruding all the bits to create the side



And then the roof



The roof needs handrails, vents and lighting added. Lighting can either be oil lamps or gas lights.
I need to find out the colour temp of gas lighting as I seem to remember during the power cuts of the 70's my uncle had a gas tilley lamp and that was very bright and daylight in colour. This will effect the LEDs I use for lighting.

Next up the underframe.

Sketch made and the side frame made



The prototype has a lower and upper footboards

I now make the upper footboard part of the underframe, with a separate lower footboad secured using staples.





To be continued .........

 

and now the springs ........

These tend to be a bit of a compromise, being able to show the leafs on the print and getting the correct number of leafs.

Started on the middle leaf sprint first which has a J hanger to support the leaf springs.

Another sketch to start with



The start playing until it looks like this





The mount for the outer axles is different





Slowly looking the part

 

Almost up to date.
Ends and sides mirrored to form the body, and partitions added to from the basic structure.



I did a test print with the model split between partition 3 & 4 before adding underframes and additional detail.
Also added some registration pegs







First off I'm happy with the matchboard effect - fillet on each board was 0.15mm and has printed out ok.
However the end thickness was insufficient to maintain shape - it was only 0.5mm thick when the partition was split in half, and was too narrow for decent supports, which I guessed.

The centre partition was increased to 2 mm thick, with the addition of 2 x 0.8mm boles vertically through the middle. If printed whole, these will print out at approx 0.6 to 0.7 mm, and will be used to carry solid core wire for the lighting circuits.



Notches were also cut in the top of each partition to support bus wires for each compartments LED.

 

Now some of the smaller details

Door handles





These will be separate items, the model used to cut the hole in the body side



Next up was the end steps and emergency stop brackets



The lower steps follow the tumblehome



so had to be profiled to suit



So that's us up to date, started on the 17th of Feb with a bit of time whenever to do a bit of progress.



Now to test build the Slaters and Connoisseur Axleguard / W iron assemblies and see if they fit.
Paul

 

Hi Mossy

For the tumblehomes I used profile cutters - one set for the ends and another for the sides.



The fun bit is with matchboard sides I had to keep each plank as a separate item until it had been profiled, then had a fillet applied (0.15mm) before I could join them together.


On these sides the paneling was on the flat sides so could be just extruded from the sketch.


I also made a cutter for each end from the full cutter to be able to make the lower end steps.


Of course to get the full step, a copy was made, and the lower section removed using the extrude command.
Then the profile cutter cut the correct shape for the base.
This was then joined back to the copies upper section and the bolt head positions adusted to look right.



Paul.

 

Oh - also forgot to mention the 40 x 24 ish mm recesses in the inside if the panels



This is to accommodate 40 x 24 Microscope cover slips, although these may be a little tight on the center panel due to the thicker partition.

Paul