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Short loading ramp in Fn3

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  • Short loading ramp in Fn3

    Hello folks,

    in order to prepare for the next operation session, I set myself the goal to arrange for some operations. So this time there will be no new waggon, but a loading ramp and some cargo.

    The ramp's design is inspired by Scott Perry's Blog, who has published a very nice and extensive series. If you look for a step-by-step guide, you can find it there.

    This time I choose a mix of my trusted red cedar and some material from the hardware store, namely some beech rods from which I cut the posts. The cross cut sled pays for itself once more.

    Posts are cut to length from beech.

    The posts are spaced in prototypical 4 ft. by 6 ft. which roughly amounts to 60 mm by 90 mm. The projected total length of 26 ft. will enable the ramp to serve a single waggon. That keeps the project at a reasonable size and the finished ramp will be almost universally usable to add an industry to small spurs.

    The posts will stand 6 cm resp. 9 cm apart, modelling 4' and 6'.

    Three posts at a time are joined into one bent. The original knack is to build the bent torsionally stiff by using two transversal timbers which give the whole ramp a stability that one would never presume in such a flimsy wooden structure. Since even this small ramp will need five bents, I'm going to construct a template to facilitate the work.

    The template for the bents is in the making.

    One needs to keep an eye on aligning the posts exactly in parallel. The template's frame is made from old skyrockets' guide sticks, which are informally hot-glued to a piece of textured coated board.

    Spacers for the cross timbers are hot-glued in place.

    The finished template helps to keep the cross timbers in place while they are drilled together with the posts. Pay attention to make the posts a tight fit in the template, they mustn't rotate any more from here on!

    The cross timbers and posts are drilled.

    For the next thing to do is placing and drilling the transversal timbers. If the posts twist within the template during this process, the construction won't fit anymore.

    The transverse timbers are drilled, too.

    As one can see, both transverse timbers lie on top of each other at the start. That's important in order to align the central hole. Afterwards they are placed in cross-shape and the remaining holes are drilled. The whole affair gets a lot easier by fixating the timbers to the posts with small pins.

    Pins prevent the posts and timbers to slip while being drilled.

    The cross timbers and the middle of the transverse timbers have to be secured with rods threaded at both ends. For this I choose my trusted pasture fence, which I've already used for the trusses of my flatcar.

    Steel rod is cut to length for the threaded rods.

    The rods are cut to length, tapped with a thread and then it's on! Well, not quite since the traverse timbers need to be fastened at their edges with a threaded rod, with a rivet head at one end. These I make out of steel pins of 1.6 mm diameter. All one has to do is clamp the pin into a multi tool so that one can get the pin's head into shape with a key file. Cut it to length, tap the thread, done!

    A complete set of posts and timbers, fittings in the background.

    Altogether one bent consists of three posts, two cross and traverse timbers each, four threaded rods and four rivet-headed threaded rods. For five bents that's 20 rivet heads to file and the total sum of 60 threads to tap. A somewhat meditative task and one gets some routine, like it or not...

    Working the batch.

    Here's one bent under construction. The cross timbers are already fastened with washers and four-sided nuts (at least, I didn't have to make them by hand as well...). The next step is to put the rivet-headed rods into place and fasten them.

    Nuts, bolts and washers are put in place.

    This is the result of the first afternoon of tinkering. Two bents are finished, three to go. The wood is stained with off-the-shelve outdoor protective, walnut-coloured stain, since I'm looking for an unobstruive, yet weather-proof finish.

    Two bents finished and varnished, three to go.

    Up next (omitting the missing bents) is constructing the platform.

  • #2
    Since the operation session draws closer I'm focused on having a working interim result rather than completing all steps perfectly. So the ramp is now being put into working order. First off, the individually constructed bents have to get connected. After that, it's planking time.

    The longitudinal beams are ripped from red cedar once again and rest on the bents' cross beams. Each bent is fastened with a rivet-headed threaded rod to the longitudinal beams. Of course one has to pay attention to keep everything at right angles.

    The bents are connected with beams and bolted together.

    As soon as the frame is done, the decking boards, which were cut and stained beforehand, can be nailed into place. I've already explained how to create those in my report on building the flatcar, so I won't go into detail here, again.

    The only difference is that I omit grooving the boards. In this particular case, I couldn't imagine a good reason to expend such an effort to a functional building like the loading ramp. It also saved me quite a time-consuming step in getting the deck ready for operations.

    The platform's boards are nailed in place.

    Quasi as compensation I've added warning boards to the long sides which give the workers some tactile hint that they are near the platform's edge. The decking boards at the platform's ends are directly nailed on the longitudinal beams, but for all other boards, the nails keep the warning boards in place, too.

    In order to have some load to move during the operation session, some slats are ripped and cut and a total of four freight crates is constructed. Those little beauties even have a removable lid.

    The platform is finished and so are the freight crates.

    Thus, once again I've accomplished my goal to bring some new material to the next operation session. Next time, the ramp will be completed and detailed.