This page contains assembly instructions for the standard 9' chassis I developed for use in some of my kits. It is also available as a stand-alone chassis, for sale by contacting me through my contact page, or sometimes via my eBay account.
All chassis kits feature:
2x Dapol spoked wheels axles
4x H&A brass bearings
2x 5g sticky ballast weights
1x FDM 3D printed main chassis
2x FDM 3D printed sole bars
2x FDM 3D printed standard brake blocks
1x FDM 3D printed reversed brake block
2x FDM 3D printed outer V hangers
2x FDM 3D printed standard brake levers
1x FDM 3D printed reversing brake lever
2x FDM 3D printed brake lever "rack"
1x 0.4mm dia x 30mm long wire
2x SLA 3D printed buffer beams with buffers and hooks
4x SLA 3D printed axle boxes and springs
Either:
2x SLA 3D printed NEM pockets without couplings or,
2x SLA 3D printed receivers for Dapol medium-D tension hook couplings, along with 2x Dapol medium-D couplings
To provide a wider range of chassis types there will be three variations:
Wooden chassis style, without tie bars (Still in development)
Metal channel style, without tie bars (Needs updating)
Metal channel style with tie bars (Needs updating)
The wooden wagon chassis features an oval on each side to simulate the Maker's plate. It features bolts where the W Irons would be attached to the soleplate. Contains optional outer V hanger for the brake levers.
This wagon is based loosely on C channel profile metal wagon chassis. the W irons are not tied with a bar.
This wagon is based loosely on C channel profile metal wagon chassis. the W irons are tied with a bar.
The kit comes straight off the printer, so some preparation is required. You will need the following tools to prepare and assemble the kit.
Small, sharp, flush-cut side cutters (Or sharp craft knife)
Tweezers
0.5mm drill bit
2mm drill bit
Pin vice / small chuck (to hold drills)
Course, medium, and fine grit abrasive papers and a flat surface for sanding, or alternatively emery boards with course, medium and fine grits
An engineer's square or similar for assembling parts perpendicular to each other. The wagon chassis and solebars must be assembled true, or the wagon will not roll as well as it could.
Your preferred adhesive for plastic. (Plastic solvent weld does not work, but superglue does)
Fine point tweezers
3.0 or similar drill for adding countersink to 2mm holes
Needle files (for dressing areas with print marks)
Cocktail stick
Paper towel
PLEASE NOTE:
The photo left (or above on mobile) is only a guide to what you get as the kit may change slightly over time to improve the kit quality. The list below, however, is definitive.
The kit consists of the following parts:
3D FDM printed chassis (x1)
3D FDM printed solebars (x2)
3D FDM printed brake shoes and lever gear (x3) (2x clockwise, 1x anti-clockwise operating)
3D FDM printed handbrake levers (x3) (2x normal, 1x reversing)
3D FDM printed V hangers (2x)
3D SLA printed buffer beams, buffers, and hooks(x2)
3D SLA printed axle box and springs (x4)
Brass H&A Models bearings (x4)
5-gram sticky weights (x2)
Dapol spoked wheelsets (x2)
0.45mm dia wire (1x)
Coupling options (Either):
3D SLA printed NEM pocket (no tension lock provided) (x2)
3D SLA printed tension lock pocket and tension lock provided (x2)
Please state the coupling options preferred at the time of ordering.
This is to familiarise yourself with why some steps in the preparation are critical for the successful assembly of the wagon chassis.
Equip yourself with course and medium abrasive paper. I use 80 grit or 120 gritm and then 240 grit.
Sanding of the chassis and the solebars is critical to get a good foundation for the rest of the wagon.
Start with a course abrasive paper and finish with medium or fine.
⚠ Note: Although this is a labour of love, the flatter and squarer the sides and edges the better the model will assemble and appear once complete. Edges that are not perpendicular to the top and bottom surfaces could lead to the axles being too stiff or too loose and falling out.
With abrasive paper on a flat surface (or emery boards)
With medium abrasive paper, lightly sand the top and bottom surfaces of the chassis to remove any printing artefacts.
Sand the sides with coarse and then medium abrasive paper to remove bumps from the printing process.
Try to keep the sides perpendicular (square) to the the top surface. Use an engineer's square, or similar to help.
Sand the ends
Sand the ends of the chassis with coarse and then medium abrasive paper to remove bumps from the printing process.
Try to keep the ends perpendicular (square) to the sides and also to the top surface. Use an engineer's square, or similar to help.
With medium abrasive paper on a flat surface (or emery boards):
Sand the backs of the sole plates to remove any printing artefacts.
Sand the tops of the sole plates to remove any printing artefacts. Try to keep the tops perpendicular (square) to the back. Suggest hold the two sole bars back to back to get even sanding.
Lightly sand the ends square, but final sanding of these are done during assembly, after bonding to the chassis.
⚠ Note: Again, this is a labour of love, the flatter and squarer the sides and edges the better the model will assemble and appear once complete.
Optionally lightly sand the front faces of the W Irons of the sole plates, and the front faces of the sole bar channel with medium and then fine abrasive paper.
Accurately drill the axle bearing holes in the W-Irons of the sole-bars with a 2mm drill, and remove any burs. Try not to over-drill or "ovalise" the holes, or the bearings will not grab well when pressed in.
Use a larger drill or countersink to remove the burrs and add a small "counter-sink" to either side of the hole.
Run the 2mm drill through one more time after to "ream" the hole.
Don't worry if the hole is a little tight as it will help to grip the brass pin-point bearing when it is pressed in.
The model is designed with a 0.5mm hole already in the V hangers, but the printing process often fills these back in, so need to be drilled out.
Before drilling the V-hangers on the solebars and also the additional external V-hangers if you are fitting them, you may need to create a "centre-dimple" in the correct location for the 0.5mm drill to start in. Ideally use a fine braddle. I am using the tip of my fine tweezers here.
⚠ You may need to poke a locating dimple in the centre of the V-hanger for the drill to start correctly, or the drill may "wander" off the centre.
Use the 0.5mm drill to carefully drill out the holes in the V-hangers on the solebars and also the additional external V-hangers if you are fitting them.
⚠ Try not to miss this step, as it is much harder to try and drill these during assembly. Yes I did try that!
Ensure the V hanger holes are clear right through
Carefully cut the axle box and springs from the supports. I use very sharp flush cut side cutters.
⚠ These are very delicate!
Carefully sand the back of the axle box and springs.
With a needle file or abrasive paper, remove any printing artifacts from the top of the leaf springs.
Using a 2.0mm drill bit, carefully clear out all partially cured resin from the hole in the axle box. Use very gentle pressure/
⚠ NOTE: Be extremely careful when doing this. If the drill binds, stop and reverse the drill out. Be very careful not to force the drill or it will split the axle box.
⚠ NOTE: Also be very careful not to drill right through!
File the "Elephant's Foot" off from the inner edge, as the presence of this will prevent the brake blocks from sitting square.
Lightly sand the flat surfaces of the brake gear to remove printing artefacts.
Sand flat, the base of your chosen coupling block. you may also need to file any "elephants foot" off the rectangular ports where the coupling will push in.
Now is a good time to check the coupling pushes in nicely. Not to tight, but not loose enough for it to fall out either.
⚠ NOTE: It is much easier to test the coupling fit now, than once it is adhered to the chassis.
If you want to use the supplied wire between the brake hangers, then carefully drill out the centre of the pivot bar of the brake blocks.
You may need to "centre-pop" a hole in the centre of the spigot first. (see inset photo) A sharp point will be needed.
⚠ NOTE: If the spigot falls off it is not the end of the world. that is more of a feature for those who are not using the wire.
The brake levers may have a slight elephants foot that needs tickling away. They may want a light sand with fine abrasive paper too.
The "toothed rack" for the lever may need a tickle and quick check that it fits over the brake lever. If not lightly sand the lever or use a fine flat needle file to tickle the inner edges of the "toothed rack"
The reversing crank, if you are using that lever, may require a little fettling into shape too.
OPTIONAL: The door bangers are optional items and are only required for some wagons. If you are intending to fit them, they will require dressing with a small file or fine abrasive paper first.
The door banger comes in pairs both attached to the same printing support. Remove the "elephants foot" if present and dress up the lower end of the banger. The tab that sticks out will need dressing to make it flat so it can be glued to the solebar.
⚠ NOTE: Take care not to file away the tiny rivet on the opposite side of the tab, if present.
⚠ NOTE: Due to the fidelity of FDM printing, sometimes the rivets do not come out well, or at all.
You have now picked up a duck.
You have now prepared all the parts ready for assembly.
Ensure all preparation stages are complete before beginning assembly.
Press the four brass axle bearings squarely into the 2mm holes you have drilled in the two sole bar W-Irons, with the recessed part of the bearings facing the flat side.
OPTIONS: There are two types of brass bearings that may be supplied; plain or normal. This will be down to what is available at the time I order the parts for these kits.
If the 2mm hole is accurate, the bearings should grip in the solebar without adhesive; Resist using adhesive if you have plain bearings as these can then be adjusted later. for the top-hat there is no adjustment, so use a dab of adhesive if you wish. I don't normally.
For standard plain bearings, press the solebar down until the inner face of the bearing is flush with the inner face of the solebar, or just slightly protruding - 0.5mm.
For top-hat bearings press the solebar down until it meets the top-hat brim.
The image above shows the bearings flush on the flat side of the solebar and protruding on the outer, detailed side.
The flush bearings can protrude on the inner edge by up to 0.5mm.
Place the chassis upside down on a flat surface. After performing a "dry-fit", using your preferred plastic adhesive fit one sole bar to the chassis in the inverted position, so that once in the normal running position the top surface of the chassis and the top surface of the solebar are flush.
Ensure one end of the chassis and the solebar are flush with each other.
Make a note of which end this is with a dot of pen or paint or a similar identifying "datum" mark. Ensure the solebar is vertically perpendicular to the chassis.
NOTE 1: The photo is for a slightly different chassis, but the procedure is exactly the same.
Once the first solebar adhesive is set, perform a "dry-fit" of the second solebar in the same way as the first, then when happy, adhere the second solebar, ensuring that again it is vertically perpendicular to the chassis and the end if flush with the same end as the other side, indicated with the dot of pen or paint.
This check is to ensure the axles are perpendicular to the chassis and the wagon will run true.
Using an emery board or abrasive paper on a flat surface ensure that both ends of the chassis and sole bars are flush, and the top surfaces is reasonably flush, too. This will enable a good fit of the buffer beam.
The end without the datum dots may require a bit of sanding to get the chassis and ends flush.
When sanding, ensure that the ends remain square to the chassis length. I suggest periodically checking with a small engineer's square.
The ends of the solebars should be flush with the ends of the chassis for a good fit of the buffer beam.
The ends should be square with the top surface of the chassis and the solebars.
Check the gauge of the Dapol wheel sets and adjust as required, then gently spring the sole plates apart to allow the axle pinpoints to nest into the brass bearings.
The wheels should run very freely if the chassis and soleplates have been assembled correctly.
If you have not used adhesive for the brass bearings, and you have the plain bearings you may be able to "trim" the free running by pushing the bearing in or out a little to suit.
I have supplied two "standard" levers and two standard brake blocks and also one reverser lever and reversed brake blocks. I think this will allow you to have either independent brakes or "Moreton-style" brakes.
I do not know much about wagon brakes so have gathered what I can from images and the internet. Hopefully, what I have supplied will give the builder of the wagon the flexibility to get close to the brake setup they want to model.
I am more than happy to take feedback on the brake levers with suggestions on how I can improve the model or provide even more brake option flexibility.
Two sets of blocks are supplied with standard actuating arms.
One set of blocks is supplied with reversed actuating arms.
NOTE: If using the supplied wire you will already have drilled out the pivots and the V-hangers, as per the preparation steps, won't you?
What do you mean you didn't? Well if you didn't then you are probably going to wish that you did!
Fit the chosen brake blocks inside the chassis on either side.
Ensure the following alignments:
The base of the brake gear cheeks are flush with the top of the chassis and are bonded to the chassis side.
The centre of the pivot bar is in alignment with the centre of the "V Hanger"
The vertical supports align with the sole bar vertical supports
If using the supplied wire as the pivot rod, ensure the holes in the V hangers are aligned to allow the rod to pass all the way through the V hangers.
Push the axle box over the axel (having already opened out the hole with a 2mm drill in the preparation steps) to ensure a flush fit against the W irons. Once happy remove and refit with a dab of adhesive.
There are two options of coupling block which can be selected at purchase. If you selected the blocks for Dapol Medium-D fit these with the internal spigot towards the centre of the wagon. You can elect to move the coupling block forward or back depending upon how close you want the coupling of the wagons.
I normally push mine as far towards the centre of the wagon as the chassis allows .
There are two options of coupling block which can be selected at purchase. If you selected the blocks for NEM pockets fit these with the widest portion touching the wagon chassis
Fit the buffer beams with adhesive, centrally to the centre line of the wagon, and flush with the top of the chassis. Ensure to get the hook the right way up! (Yes I have done the opposite one time! Doh!)
Decide which brake levers are appropriate to the wagon you are modelling and pass the lever through the rack, ensuring the square "nub" is recessed into the solebar which brings the rack outwards slightly.
If the type of wagon you are building comes with door bangs, then fit these centrally to the chassis.
If you have a "Chromium-based" browser like, Chrome, Safari, Opera, MS Edge then you can right click on a blank portion of this page to open the page context menu, and select Save as PDF... and save this to your PC. The PDF file can then be opened for printing.
PLEASE NOTE:
The Print... option from the page context menu does not appear to render this page very well for printing.
The most up to date version of this document can always be found here:
https://sites.google.com/view/dibsyard/3d-printing/standard-9-wagon-chassis
If you have found these instructions difficult to follow, or have any feedback on how they can be improved, please use the contact form to send your suggestions. I strive to make the instructions as clear as possible, but I may have overlooked key steps.
If you have any ideas which may improve the kit in general, please also fill in the form and indicate your suggestion.