Category: CKH Kit

Time to complete the rest of the framing. The footplate lays at the rear of the engine across the frames and forms the floor of the cab. Here, a thin sheet metal is being fitted.

Then the two sidesheets make up the side walls. The left sidesheet is metal plate like the foot plate, but the right is styrene because it makes cutting the arc for the reverse bar easier.

Those three sheets complete the “well” at the bottom of the cab. Also under the footplate is the rear air tank.

Then I went ahead and dry fitted the running boards and the cab just to see how she’s coming along.

It looks like pretty complete but there are a lot of details left. Plenty more of work to do.

Okay, time to update the model! I know it looks like there hasn’t been a lot of progress, but there’s just a lot more of the little details to put together rather than the large pieces. But today’s update is certainly a big one: the boiler finally gets set on the chassis, and the model now look significantly like the Holliday.

First, I realize that the lighting is not great. I’ll update the…the update…with natural daylighting later. Anyway, the above shows the mainly completed chassis, including the engine brace, forward tank, rockers and links, eccentric rods, saddle, and a simplified spring and equalizing system. But, All it’s all hard to see with everything painted black.

Here the drivers and pilot truck are fitted into their places.

And the boiler set onto the chassis.

The boiler jacket is painted a special gloss black with a drop of silver. In the daylight, the color is a dark gray with hint silver speckles–pretty convincing I think.

You might notice that the sand and steam domes don’t appear to be parallel, but I think that’s an illusion in the pictures. They seem to be upright in the real model.

When I was building the computer model, I posted the same milestone update when the boiler was set on the chassis. For comparison, here’s the computer model I posted in that update:

So, hopefully the next update will be the running boards set in and preliminary plumbing. Then, setting the cab should be about the end of the model.

It’s been a while, hasn’t it! I’ve been busy with school work and interviewing for jobs, so I haven’t had much time to put the model together. Instead, I’ve been prepping individual pieces here and there–getting them ready for the major assembly.

Last update I said that I redesigned the cab and pilot parts. So, I’ll show you that first.

I mainly redesigned the pieces to fit together better–there were problems with the first cab where the cab wasn’t truly squared. Also, the posts have been realigned so that their grains run vertically–previously they ran horizontally.

The new pilot now have the little bumpers on the side.

And here it is painted in special red: my custom mix of bright red and a touch of black and glossy lacquer.

The pilot truck is painted and fully assembled. A neat little feature is that–because it’s built like the real swing-type pilot–the casting piece actually does swing! But that’s of little consequence in a static model. Nonetheless, it shows how well the model reflects the computer model, which of course reflects the real engine.

The saddle is painted as usual, but the steam chest gets wrapped in real brass sheeting.

And the same technique was used for the domes. The brass will get cleaned and polished before they get placed on the boiler.

And to a larger extent, the boiler gets wrapped in thin steel sheeting, which will of course get painted glossy black.

The wrapping around the backhead was notoriously difficult. As is the result of working with sheet metal at such small scale, there are some scratches and bumps on the jacket that I’ll have to smooth out. But I think the paint can help hide them.

I decided that the wooden parts could use another iteration of redesign. This will delay the completion of the kit a bit but I think it’s worth it.

Both the cab framing and the pilot were redesigned to make assembly a bit easier and make the parts more accurate to the real counterpart (within the limits of material, that is).

Here’s what the layout looks like, to give you an idea of how many parts there are:

The kit will of course comes with its own set of assembly drawings. Here’s a page showing the cab framing identifying the sub-parts.

Yea I know, how many “first looks” can there be?

In this update, most of the “recognizably steam-locomotive-ish” parts came in. Here’s the spread–and it may not look like it, but there are nearly 60 parts in this picture.

Unlike the prototype boiler I showed you in the earlier update, the final boiler in the kit will include the jacket’s thickness. The picture of the backhead shows some cutouts for the valves and hardware.

Details like intricate moldings around the domes and headlight panel beveling are exact to the engine plan, and of course the real engine. Note that although I designed the eagle for the top of the sand dome, it turned out to be too small (thin) for the machine to reproduce. So, the elusive eagle got away again!

Check out the bolt heads on the smokebox front, and the riveting detail on the smokestack! For the kit, I redesigned the stack’s wall to be thicker than the real engine’s (the real stack is made of sheet metal) to give the part some structural integrity. As a result, the stack’s opening at the top looks a bit narrower than the real engine would.

Here are some of the very small parts, the lifting shaft and one of the links and its block. And checkout with webbing on the inside of the pilot wheel.

And finally, here’s the boiler with the domes and the stack dry fitted. It’s looking like a train!

The kit is not made entirely from plastic. The cab, pilot, and the pilot beam are made from birch wood. The pieces are laser cut for accurate fitting. Of course, they were designed directly from the Plan Book. Here they are in the bag from the manufacturer, and again sorted over the layout drawing.

All pieces are 1/8″ thick, which initially made me concern about the pieces being out of scale. But when they’re assembled (see below) this effect is not at all obvious.

The real cab have recessed paneling and molding. The panel molding is too small and impractical for the scale, but the recess is achieved by laser engraving–partially cutting the panel piece to simulate panel recess!

Ok, let’s put it together: I started with the front panel, then work my way around to the rear and the roof. Since the pieces were made from the Plan Book and mirror their real counterpart, putting the model cab together is also like building the real thing, with posts and panels to fit together rather than pre-completed walls. I think this gives the model very good looking panel lines.

Here’s the front panel fitted on the boiler. The curved panels fit on the boiler just right.

The rear walls also have recessed panels.

The angled roof rafters complete the cab’s framing! Note the small hole at the center of the front header. This is for the whistle lever. I’ll need to drill a smaller hole for the bell rope (I think it was too small for the laser to cut). There’s also the window sills.

It took me about 2 hours to complete the cab at a leisure pace.

To save some costs, the cab parts do not include the actual roofing, and it would also be out of scale with 1/8″ wood. Instead, I’ll complete it with very thin wood sheet. Or better yet, use thin wood strips to actually plank the roof.

Assembling the pilot has two parts: building the frame, and building the bars.

And completed:

Note the bars are a little bit longer than the bottom triangular frame. This is to allow them to be slightly shaved off at an angle and sanded so they’ll have the smooth, curved appearance seen on the real pilot. (The curve’s contour can also be seen in the Plan Book).

Even without working the bar faces to a curve, I think it already looks pretty good.

The bars are a little bit oversized for the scale, so the model pilot have 2 bars less than the real pilot. It’s not really noticeable unless you count them, but I thought you should know.

The model prototype is finally here, and it’s a good feeling to finally hold the physical model after months of work. And it really affirm that the model is really happening!

Let’s take a look!

At 1:20, the model will be about 13″ long when finished. This size will be able to accomodate a lot of details to the engine.

The model is made by 3D printing. This gives it more detail than a model made from CNC manufacturing. Check out the staybolt details on the firebox! There’s even spring hangar bearing surfaces on the frames, and hook points for the tender chains on the drawbar!

They are a couple of things that should be observed about this model:

1. This was made from the first prototype model, the one without boiler jacket and saddle finishing. Final version of course will have those.

2. The surfaces are a bit rough as a result of manufacturing, with some white powder residue. Ruling on curved surfaces are obvious because of the same, but these can be sanded away easily.

3. Some parts, especially the frame, is a bit flexible. It may require the user to add metal supports to the forward leg to actually hold the weight of the engine. The upward bend is also the result of manufacturing, but I was able to bend it back down in place.

And 4. Some parts are “warped” very slightly due to manufacturing tolerances. This, I think, won’t be noticeable when the engine is finished, but I thought you should know.

I really like that the details like how the staybolt heads on the firebox came out. The spokes on the driver tapers like it should, and even the tender hook on the drawbar came out great.

The final kit will have over 60 parts (maybe 70). This preview is only showing 5! I’ll show you know what they are later, but they will make a very accurate CK Holliday. Or, the kit can be a basis for many other 4-4-0, such as the EP Ripley, since there are very few Holliday-centric parts (I think less than 4).

I ordered the rest of the parts so I’ll show them here when they’re ready. Now, I’m off to the hobby shop to get some supplies to put this thing together!

There’s a slight delay in producing the first CKH semi-kit. Hurricane Sandy took out the manufacturer’s power so I’m waiting for them to restore services. The original estimate to have the prototype ready was about today, but now there’s going to be just a bit of delay.

In other news, in addition to the plastic chassis and boiler kit, the semi-kit will also include precision laser cut wood parts for the cab, the pilot, and the pilot beam, so now you’ll also have authentically wooden cab and pilot. The cab is going to be very slightly over dimensioned due to the type of wood and machining requirements, but it will also have recessed panels.

This is not indicative that a CK Holliday kit is forthcoming, but to help make it so someday, please voice your opinion on what parts you would like to see if you were to purchase a CK Holliday semi-kit.

Select as many answers as you want, but remember that as you select more parts, the price of the semi-kit will go up! So, try to be conservative, but it’s still like a wishlist so you’re really free to mark whatever you want.

Also, how big should it be?

Finally, please select the range of prices that you’d be willing to pay for a semi-kit containing parts you marked above.

Thanks!