Sunday, January 29, 2017

HOn18 Mine Cars, HO on Z scale track

I designed an HOn18 engine sometime back.  The shell fits over a MicroTrains mechanism.  Link to blog entry on the engine.

These little cars were inspired by George at Show Me Lines Trains in Grandview, MO.  He showed me a picture of a side dump car, and wanted to know if I could design and 3D print something similar? 
My first thought was, well yes, but not with my home printer, but then, I came up with some ideas to try.  One of the good things about having a home printer, is that the failures don't cost much, and now I have a lot of junk for around the mine site.  I tried more designs than I can count, most worked to some degree, but others were complete failures.  Here are a few, but not all of the different designs I tried.
 I decided early on to use Micro-Trains Z scale Arch Bar trucks as the standard to design around, and also use their Z scale couplers.  These could also be push carts, particularly in S and O scale, and then have no need for a coupler.  You will notice that the design closest to the from, has no bottom.  I designed it so that I could put a piece of brass bar in the floor to add some weight.

 Once I figured out the dimensions and shape needed to fit the trucks and couplers, I took those designs and started trying other options using the original base.

 I used .030 styrene for the connector between the tipper and the rest of the car, and thus the tippers will actually tip, as long as you only glue the styrene rod at one end.

  I am sure there are many more possibilities, and I am sure I will come back and do more in the future.

 As I mentioned above, it took several redesigns to get the trucks to fit properly.  

 Here are several early attempts.  I am never going to get a completely clean angle with and FDM printer, but it only took a little filing to get it looking reasonable.

 This kind of give you an idea of how many failures I had, just getting a square box on wheels.

 This is a good example of the layering making the item, in my opinion, unacceptable.  Note the layering on the corner boards.  It makes the "grain" run the wrong direction, horizontally, rather than vertical.  In subsequent designs, I left off the corner boards, and added styrene strips.  

A couple of things to note.  The bottom gondola has had the brass bar inserted for weight.  Also, the corner boards on these gondolas are styrene strip, which looks much better than the printed vertical boards.  The side dump cars, several different versions, various stages of completion, natural ABS, and primed.

I painted the side dump cars with Sophisticated Finishes Rusting paint.  The gondolas were painted a wood color then a wash of India Ink and Alcohol.  

The trucks were installed using the Micro-Trains pin provided with the trucks.  As I recall, I used the 2-56 tap drill size as the hole for the pin, and it worked great (there does seem to be some variation in the pin diameter).  The couplers were installed using the screws provided with them.

Here is a shot of the engine and cars sitting on some Micro-Trains Z scale track, a penny to the right for scale reference.  Again, these could also be used in S and O scale for push carts.  

Some mining inspiration, a blog post of from several years ago from the salt mine and museum in Hutchinson, KS.

Sunday, January 8, 2017

Video of Machine Shop

A couple of short videos of the machine shop.  I gave it a spin on a turntable.  Construction of the building, which is 3D printed on a home printer, can be seen here.  Since the video upload to Blogger is so poor, here is a link to it on Youtube,

Most of the interior details I designed for printing at Shapeways.  The design details were covered in several posts last year.  The first covered the Metal Shaper and the Bandsaws.  The second instalment covered the Large Lathe, Vertical Milling Machine, Air Compressor and Bench Grinder.  The third post covered the Surface Grinder, Horizontal Mill, Drill Presses and Welding Tanks.  And here is a Youtube link for the interior video,

The details from Shapeways can be purchased at:  The set includes a smaller lathe that is not in this shop.

Thursday, January 5, 2017

3d Printed, Arch Roof, Clear side walls, Machine Shop.

Although this building has a full interior, this post will mostly cover the structure.  The building was printed on my Afinia H479 printer in ABS.  I designed it in SketchUp and sized the openings to fit Tichy windows and doors.  HO scale.

I designed the machine shop tools a year ago, and had them printed at Shapeways.  I posted about them in three previous posts.

Part one: Metal Shaper, Bandsaws
Part two: Large Lathe, Vertical Milling Machine, Air Compressor, Bench Grinder
Part three: Surface Grinder, Horizontal Mill, Drill Presses, Welding tanks

 Here are all the parts, as originally drawn.  I designed the upper side walls, and the gable ends to be printed in transparent filament.  It is marketed as clear, but it certainly is not.  I does work great for glass blocks, spiral-chimney-glass-blocks and memphis-store-front-3d-printed-glass-blocks

There are always things that I would do different if I were to do it again.  If I were to print the end panels again, I would add the support material shown in the drawing on the left, to give the panels a cleaner edges on the lower curved edges.  The picture on the right shows how I printed the ends I used.  If you look closely, you can see the rough edges.

The roof parts, painted and ready to assemble.

I would say that I am test fitting the roof on the walls, but you can probably figure that out on your own.

The roof and walls are printed in natural ABS, primed and painted, the roof silver and the walls gray.

Test fitting the Tichy Windows.  Both Grandt Line and Tichy have good web sites, where they show all the openings needed for the windows they offer.

 I had not originally planned on making a diorama, but I decided to in the end, adding a welding table out front, and a storage rack.  The storage rack was 3D printed on my printer.  The material on the rack is from the junk bin.  Mostly left over shapes from wood car kits, where I replaced the wood shapes with styrene.  

The diorama base was also needed for protection for the windows, if was was going to have any of them open.

I did add a minimal interior to the office, but unless I stick some lighting in it, it is barely noticeable. Both the rolltop desk and the chair were 3D printed in wood, so no finishing was needed. 

 I added some angle around the roof, so it would fit tight on the building. 

I am sure I forgot something, but this post is getting way to long, so I will end it here.  I prefer to spend my time modeling, versus writing about it.  I have 23 posts in various stages of editing.  Back to modeling.

Previous 3D printed structure posts that might be of interest:

Friday, December 23, 2016

2016 Turkey Creek Build Challenge entry, Larry & Steve's Quality Automotive, part 2

In case you missed part 1, where I cover construction of the main building, 2016-turkey-creek-build-challenge-entry

A lot of scenic items and the small building were from the Woodland Scenics Smiley's Tow Service.
The parts in the Woodland Scenics kit.

 The diorama is about 12" square. The posts were cut from dowell stock, and the horizontal boards are from the Woodland Scenics kit.  I drilled holes of each post, to they are installed solid.  I used whatever I had laying around for the fence.  

 I had never used static grass before, but I was not going to spend a ton of money on a grasser.  I built mine using instructions by Ken Patterson.  Here is a link to his video,

 I am not good with electronics, so if I can make one, any one can. The parts I bought to the left and the leftover parts for use someday for something to the right.

Here is the finished grasser.

Some examples of the applied grass.

I used several different brands of grass.  Whatever was available at the LHS.

I cut the souped up engines out of some old Hot Wheels I picked up at a flea market for 50 cents, and set them in the parking lot, as though they had just been delivered.

Larry and Steve are converting the old junk yard into a speed shop.  

 Larry and Steve have started fixing things up, a new sign, a new roof on the office, and replacing the bad boards in the fence.

 A view from the back, shows the patchwork fence still in place there.

 Details came from the Woodland Scenics kit, the junk box, and I 3D printed some.

 The vehicles, well the ones that are not junk, are from CMW.  The flatbed on the red truck is 3d printed, including the wood bed.  Here is a link to a blog entry I did on 3d printing with wood infused filament, 3d-printing-with-wood-wood-infused-pla

I circled a few of the items that I designed and 3D printed.  As mentioned in the previous installment, the roof ridge cap was printed in copper.  I have a couple of blog posts on 3D printing with copper, 3d-printing-in-copper part 1 and 3d-printing-in-copper-2-3-weathering.  The Chimney was also 3D printed.  In the front corner of the fence is a pile of copper scrap.  This is scrap from printing in copper, and I ground up the scrap in a blender before weathering it.  The gate, including the corrugated metal were also 3D printed.  To the left are the four truck bodies I designed and printed, including the trash truck body.  Two the car frames were printed, and the one mostly buried in grass came with the Woodland Scenics kit.  The two big wheels, pole road engine wheels, the large tires next to the trash truck, and the fan blade were also printed, as was the yellow car body in the near corner.