Sieve Experiments

My soil sieve arrived unexpectedly early so I took advantage of the sunny weather to experiment outside and see what I could come up with. I started with some of the contents of a leftover bag of limestone screenings with thoughts of producing my own ballast. (When it’s not cinders, ballast in southern Ontario is usually limestone.)

The sieve came with three different meshes: 1mm, 3mm, and 5 mm. 1mm is about 2 O scale inches so about right for ballast. Or that was the theory, anyway. What I failed to account for was all the smaller bits and outright dust that also passes through that mesh. What I got was good “dirt” material but not ballast.

I then hunted around the house for something with a finer mesh. I was partially successful in that I found a bit of plastic screening but it looks to be about the same as the 1mm. I tried sandwhiching it between two of the screens and did get some “ballast”. I think it looks darn good but the amount produces is such a low ratio to the total material processed that I could not reasonably produce enough to do even a small layout such as Comstock Road.

Not to be discourages, I decided to use the “dirt” as a first texture layer on the foreground test scene. It is undeniably an improvement over brown paint.

Next I need to round up a suitable brush for stippling on glue and shoot some grass on this thing.

Foreground Staging: Useful Scenery Practice

I have been sporadically putting in the foam scenery base of Comstock Road but with no sense of urgency. I think that part of that lack of drive is due to a bit of uncertainty about the next steps. I know what they are, more or less, but have not done some of them in a long time (mixed Sculptamold in various consistencies and configurations) or ever (applied static grass). What I need is a practice project with low investment, material or emotional.

Coincidentally, I have been using my scheduled reading time to catch up on my pile of partially read model magazines and came across the perfect project concept. In the November 2020 issue of Railroad Model Craftsman, George Dutka presents the idea of foreground staging. This is a small, simple, scenicked diorama used to provide foreground in layout photography and hide the front fascia. It also provides a way to temporarily deploy structures that don’t otherwise have a home. (If you are familiar with George’s work, you will know that he probably has an extra structure or two about the place. 🙂 )

Given the narrow depth and close to the edge track locations of Comstock Road, some foreground staging is something I can definitely use. The entire scene in front of the traverser will only be about 6″ deep. The diorama is inherently expendable and quick. So I am off! I have gotten as far as the “paint the Sculptamold” phase but am stalled a bit on some materials.

I am assembling appropriate ground textures from local sources, a process much slowed by the current Toronto area lockdown but not impossible. Hopefully, once I get ahold of some suitable sieves I can get this done. With curbside pickup and online shopping only, I can’t stroll the housewares aisles looking at the size of the meshes in the strainers so I have resorted to the online retailing behemoth for a set of soil sieves. Now we wait. And collect and dry used tea bags. By the time I get this done, I should have shaken out all the bugs in a basic scenery system.

As a thoroughly unimpressive illustration of the concept, here is what the aforementioned foreground track looks like with and without my work-in-progress foreground bit held in front of it.

Including of a structure to frame an edge will require a steadier setup than board held in left hand and phone in right. George recommends accumulating a suitable stack of boxes.

About That Foam Scenery

During some of my scheduled shop time, I have been working towards getting all of the spaces between the tracks filled in with foam. The first priority to is relieve my anxiety about any derailments involving rolling stock making a fast trip to the concrete. Nothing even close to that has happened and I am generally well pleased with operational performance so far but it is still something I worry about.

Getting all those non regular shapes cut and fitted is time consuming and got me thinking about what I might do differently next time. I haven’t really settled on anything but I did want to share what I have learned about this approach. Queue the list.

  • Retrofitting foam is fiddly and time consuming. No matter what methodyou chose it will take time and probably involve a mess somewhere.
  • I have tried tracing the shapes onto the underside of the foam from below. This is awkward and not as accurate as I hoped. I always have to trim things down.
  • I have tried “routing” the shapes by tracing the edges from above using hot wire tools. This produces closer shape matches but has the various drawbacks of hot wire tools. Ironically, the Hot Wire Foam Factory router tool doesn’t work as well as the “knife” tool. The router is too short and too thick.
  • Foam board aka extruded polystyrene rigid insulation is very slow to cut with hot wire tools. The Hot Wire demo videos all depict white foam “bead board” and are clearly the intended material. I will consider using that instead for future projects if I don’t need the structural feature of the rigid foam.
  • Polyurethane glue works a treat but squeezing the bottle (LePage 200ml) for long beads is hard on the hands. I have resorted to using a quick grip clamp as a squeezer.
  • T-pins are great for holding foam bits together while the glue cures. T-pin use number eleventy-one.
  • Fumes from hot wire foam cutting are unpleasant. duh.
  • Getting the pictured foam in along the back edge strongly validates the removable backdrop design. It would be a real bother to do from the front.
  • Ditto having the layout lighting working.
  • Glue instructions say to dampen surfaces prior. Choose a stable container for your water supply. Just sayin’…

I expect to have everything roughed in sometime next week and will probably roll straight into some final contouring with additional layers of foam and sundry coatings. I have a jar of Foamcoat I intend to try out in addition to the traditional Sculptamold.

Lighting Update

I previously described, I installed an LED strip in valance of Comstock Road. I applied it using the self-adhesive backing which turns out to be less than permanent. On multiple occasions, I entered the room to see one of the two strip sections dangling down, held up only by the wires at one end. This, as they say, won’t do.

After a bit of research, I decided to try double sided carpet tape. If that fails, I will go all the way to stables or some other mechanical fastener. Having got the valance down to do the taping (not trying that upside down and leaning into the layout), I decided to continue with running the wiring.

I will likely change power supplies when I add a second strip so the current power brick is temporary-ish. I have been hung up on the idea of some sort of shelf but decided to just zip-tie the brick to a cross member.

Zip ties, what can’t they do? El Kabodge strikes again.

Roller Gauges: Design Meets Reality

Two Proto:48 Roller Gauges

When I got to actually laying out the dimensions on the first gauge (ie, marks in big Sharpie with dial calipers, I belatedly realized that the .036 flange width on the ends would be very delicate and vulnerable to damage if one, er, hypothetically dropped one on a concrete floor. Which is why my previous efforts had .100 rims rather than aspire to fit right in the frog of turnouts. I opted to repeat that choice for durability’s sake.

Being an aspiring novice hobby machinist, there are things I know need improving in the execution of these parts. Measuring those small gaps with dial calipers isn’t the most precise method but all I have that works. The finish isn’t as smooth as it should be which I know how to fix but will require developing my tool bit sharpening skills. There are probably things I don’t know that should be improved, too.

Anyway, parts done and sent off into the pre-Christmas postal maelstrom.

Designing a Roller Gauge

I have a request from a fellow Proto:48 modeler for some roller gauges. These handy things are just the ticket for handlaying track and, as far as I can tell, not something you can get for Proto:48. (There are commercially available gauges for most of the regular track standards) While I am not prepared to make lots of gauges on my entirely manual Myford lathe (You would want a CNC machine to do this commercially) I am not averse to knocking out a couple. Once I finished my Milling About and rearranging the shop…

Milling trials having been concluded (more on that later) and shop having been rearranged including new task lighting and a shelf over the lathe, I am ready to actually make something which leads us to objective of this post.

The relevant dimension of the target rail is the width of the rail’s head since that is the part the gauge has to fit over. The measurement reported for ME code 125 is 0.056″. The rest of the numbers needed come from the NMRA trackwork standard for Proto and Fine Scales S3.1. From the Proto:48 line we get a gauge range of 1.177-1.203, a flangeway width of .036-.039, and a minimum flange depth of .026.

From those numbers, we work down to something I can aim for on the lathe. I say aim because I can miss a dimension by a couple of thou and still get working gauge. A couple of thou is a long way in machining(famous last words).

  • The desired target gauge is the middle of the standard so 1.190.
  • We want the gauge to fit through minimum flangeways so .036 wide and .026 deep.
  • We want the gauge to be accurate without being difficult to fit on the rail or roll along it. This suggests a loose running fit (had to look that term up) so I will add .003 to each slot to get .059. As a check, 1.196 is well within the standard’s maximum allowable gauge of 1.203.

Here is a very low tech sketch of the planned work:

Proto:48 roller gauge for ME code 125.

This Thing is Lit

While things have been off and on lately, I have finally managed to get the LED strip installed on (in?) the valance and wired up. The wired up part is only to the valance end as evidenced by the unsightly cord and power brick perched on the layout at back right. It should not take much more effort to get some concealed wires going down the back of the wing. I just need to settle on how to get from there to under the layout in a easily disconnectable manner.

I am happy with the lighting result but the intensity is on the weak side for photography. I will almost certainly add a second natural white strip in the not to distant future. I might make it switchable so I can vary intensity to suit.

I think that I will next have a go at complete the basic landforms and roll right into mocking up buildings.

Almost Done Painting

I was going to report that I was done with all the painting until I realized that I still need to do the rear of the backdrop sections. But all visible wood has been done. It is just waiting to finish drying before I reattach the front wings onto the sides. The quick install was verified as I reinstalled the sides as a convenient place to put the dry-to-the-touch pieces while they finished curing.

Things are going slower than they might have because my attempts to replace the now used up 21 year-old! can of Behr flat black paint foundered on the twin rocks of the whole paint code and formulation system having changed during that period as well as Behr seeming to have stopped shipping quart cans of flat. Gallons and sample size you can have but not a quart. No idea why but I do know that a sample size is not enough and, given how long it took me to use up the last quart, a gallon is more than a lifetime supply.

The resolution was to get a quart of Glidden flat black instead. The colour matches but the sheen is not identical. Fortunately I arranged to finish whole sections with the old can so nothing has to be half and half.

Once I get it all done and post the final result shot I will be out of excuses for hanging the LED light strip and getting on with the scenery.

What Colour Is The Sky?

It turns out that this is not a settled question, even in the real world. Local conditions can affect things enough that opinions will vary by geography, never mind personal perceptions. It also turns out that the Behr Android phone app and I have vastly different perceptions of what that sky blue colour is…

Long story short, I rashly tried once again to match a colour photographed under natural light with the app and did not get satisfactory results. My phone shows a nice sky blue and the paint is downright purple. Even with some added white it is never going to do except for perhaps as a participant in a spectacular western desert sunset.

I ended up finding an online discussion of sky paint colours and, for the record, went with somebody else’s light sky blue: Behr Serene Sky 540C-2. The failed match was Periwinkle P540-4. Interestingly, one of the reported sky colours in the found discussion was a periwinkle although not this one. No photo of the result as far as I could tell so who knows. I will stick to the pale white-ish blue suggesting a hazy summer day.

Here is the colour on first application with the failed contestant represented on the stir stick. You can see the some of the problem because even the sky blue looks purplish which is not representative of the in-person view at all. More photographic experience and fooling with lighting is indicated.

Light Support

I have finally got the non-hobby project out of the shop and am unstuck on the infrastructure to stick the LED light strips to. As I previously discused in Lighting Mockup, I am going with a simply box. Two strips of 1/4″ birch plywood reinforced with some small blocks and held together with screws and glue should be robust enough.

The only downside is that I need to paint the things before I can actually stick on the light strips. Thus, the assembly is the first bit of Comstock Road’s top hamper to get painted. And the only bit that will be white to maximize light reflectivity.

Here is the assembly in progress shot. Note to self, need yet more clamps!