Drummond HR 13.5 ton 4 wheel brake van

A wee bit of free time this weekend, and as a break from painting wagons and while taking stock of my stock, I realised I only have 1 built HR brake van. I do have a coupled of Pete Armstrong's 6 wheel body etchings, but they will require a lot of work to source / create all the parts, and my layout is commited to the Coupar exhibition in July.

So I thought lets stick to what I'm familiar with - 4 wheel wagons.
In Peter Tatlows HR Carriages and wagons book there are drawings for 3 wheel brake vans. HR Dia 24, 26 &39.

Dia 26 is Drummonds 4 wheel 9ft wheel base 13.5 ton based on Caley designs. The HR had been using 6 wheel brake vans for some time. However to save money Drummond went the tried and tested smaller lighter Caley design he was familiar with. These were not popular with Guards, cramped conditions, side duckets and no birdcage. More importantly, Drummond found out that heavy trains and steep slopes needed the heavier 6 wheel designs he was replacing with these vans.

So here is my attempt so far



The foot boards I've tried to reinforce



And intend to use 0.6mm brass wire



The wires will be glued into pockets in the step boards, with soldered joints to connect the vertical and horizontal wires.

Braking will be fun as I've never done a wagon with more than 2 shoes per wagon let alone two per wheel.

Brake wheel, internal seats and stove will also be modelled.



Slots are on the inner wall for the partitions to slide into place



I will see if I can fit tecesses into the ends and partitions to take microscope slide covers to act as glazing.

Paul

 

So that the bracket doesn't look too heavy I've sunk it into the sole bar





I will need to check if I have clearance for the leaf springs



And if it will print - maybe very slow lift speeds and lots of supports

Paul

 

Cutouts made for slide glass covers - 18 x 18 x 0.2 mm glass. Apertures cut at 19 x 23 x 0.5 mm to allow insertion from the top.





I will use liquid glazing for the ducket windows.

 

Mossy, I'm hoping this works, otherwise I may need to learn how to make etches.
Although, if this does work, it's a double edged sword, as each side will use 20 pieces of wire.
If it prints, then it maybe trying different wire types, Brass, Nicel Silver, Steel or even piano wire.
As I haven't needed sprining on the chassis (yet), then I could cop out and make it part of the W iron, face I could make the W iron, Leaf spring and axlebox all one unit.
I know I still have the cutout for the axleboxes, I just worry how much weaker that will make the assembly for printing.

 

A little more progress - door handles

 

And of course a stove





Suppose I'd better give them seats as well, oh and a set of brake handles

 

Hand brake assembly



and with the wall fitted



Pity these wern't built with glass roofs, as you might be able to see this.

 

My brain hurts



Although I may need to leaf springs as I may have made them too thin to see the individual leafs



Now these didn't cause the brain ache, I started on the brakes



All the bits move - for the moment, super glue or paint will fix that.



The base brakets locate over the W iron bracket and allow adjustment to center the brakes over the wheel tread.

Now just got to work out the rest of it, not too many clues on the drawing.

John Duffy has been doing some research and there doesn't appear to be many differences between the HR version and the CR it was based on.

Even luckier for me the HR versions were built by RY Pickering, so I have already created the builders plate.

Time for a lie down.

Paul

 

Almost ready for a test print



Just need to add seats in the duckets and a pair of storage lockers in each vestibule.

 

Hey - I have enough issues getting the designs out of my head and into a format that both fusion and I can understand - there's too many grinding gears in my head already.

Test print ready to go, hopefully printed by midnight

 

6h50m to print. Print looks good, so good I've started a second print.

Still need to create the two lockers - one in each vestibule and the two inclined seats in the duckets.
Oh and buffers

While all this printing was taking place I modified the HR van into the CR van it was based on



Needs CR Axle boxes and buffers

Paul

 

A few pics

I have printed the hand rails

Worked fine for the sides, but on the ends I will have to add more brackets or replace with bent wire.

The footboards - due to the delicate nature I printed 2 per side

One center support failed, but was ok on the second print

Stove and handbrake coloum

Axlebox, brake rods and blurry at the rear the A frames for the brakes.

The floor underside with a test fit of the brake actuator and pivot support

They have been cured, progress over the weekend will be slow as we (DMRC) are at the Glenrothes MRC show.

Paul

 

Andy

Try the RERF test exposures - I use the 5mm cube measurement to give the first test exposure, and if ghoosing between two similar test resuts will try the under exposed result first. This tends to print finer detail than over exposing, but may need raise lower speeds and heights tweaking to stop fails.

Paul

 

Thats the one,

One side has a Hexagon , a cube and a Sphere.
The cube has a number 5 on the top surface, measure across the number 5 that should be 5.0mm, pick the exposure time that gives 5mm. If you have more than one exposure that gives 5mm then pick which gives the better result for all the other bits. For me I need the dimentional accuracy to be correct, then will pick the result with the lower exposure as that will normally print finer detail, overexposure will make the finer detail thicker. There is a risk of the print not sticking, but that is a different issue

Paul