This weekend's project comes from the pile of inactive projects I have lying around due to insufficient tech to advance. The list results from ambitious project ideas that have been stopped by one or two major problems that prevent finalization of construction. Oddly, the one stopping this week's project was something fairly simple: a hinge mechanism.
After moving off to other games, I ended up playing S.T.A.L.K.E.R. : Shadow of Chernobyl with the 2009 Complete mod. Bad idea. Mostly because it ended up crippling the AI and giving me the most lopsided and overpowered weapon in the game's programming: the Hunting Rifle, otherwise known as the ТОЗ-34 double barreled shotgun. So I had fond memories of using my Russian beatstick to take down mutant dogs, SPETZNAZ and other hostilities using a variety of buckshot, slugs and the occasional flechette. Thing is just absurd with slugs.
Anyways, to properly give tribute to my trusty pal that stood by my side for 90% of the game (the 2009 Complete mod gives you this shotgun fairly early in the starting zone), I had to recreate it in 1:6 scale. To understand what the gun is like, here's a Russian tech spec for the gun. The hinge mechanism is composed of a ring and guide rails, so there's no traditional hinge pin type joint. The issue is that the center of rotation isn't somewhere convenient, as it becomes located near the bottom surface of the barrel assembly, where there isn't enough material to support a pin. A fairly simple problem and one that prevented it from going anywhere for about 3 months. I decided to do an approximation that put the pivot somewhere close to the original but used a traditional pin to hold it together. I used some tricks to hide the hinge so you can't tell offhand how it's done.
First, the schematic! (A very poor one)
This is all you're going to get. It's not a very complex model in theory, but I had some additional plans. For this model, in addition to the expected break action and lever lock mechanism, I wanted to go one step further and add a working shell extractor mechanism similar to the one on the actual shotgun. For that, I needed some extra shotgun shells, since the Force-a-Nature and Sledge's Shotgun are tying up the remaining shells I had. Hence, the endeavor to build my own shotgun shells last post.
The barrel is hollow, and to make one strong enough to withstand minor bending and light play, I chose to use one layer of Magic: the Gathering cards wrapped around a 2mm diameter compressed air straw, surrounded by printer paper for a final outer diameter of 4mm. Process is fairly simple, I'm sure you know how to roll a paper around a tube. I had to make two of these for the upper and lower barrels. I had to sand them down flat where they'd join for extra contact and to minimize the overall height of the assembly.
The latch mechanism is the same from the Force-a-Nature shotgun: Z shaped lever pivoting around a tube embedded into the stock, then sliding to engage a 1mm wide notch.
I did have to cut away a piece of the barrel assembly after gluing them together, since the ejector was an afterthought that was born from convenience. Not hard since I was removing soft printer paper and not a durable Magic card. I had to replace the missing section with a similarly shaped piece of printer paper, with the same curvatures. Gluing the two paper clips to the sides was easy with the resultant grooves.
I've learned to appreciate the level of detail a toy manufacturer can get into a model after attempting to get the shell ejector mechanism working. This model would be costly and fragile if it weren't for the metal components, and even then, it has a lot of delicate features that aren't good for a frequently handled item. Best as a showpiece.