In yesterday's blog I described my husband's hobby which is to build fully functional models of the Mercedes Benz Unimog truck series in 1:12 scale which can be driven by remote control.
Today's blog provides some details about the transmission, suspension and the chassis.
Photo #1 shows some of the parts required for a 3-gear transmission. My husband milled the hollow housing with the unusual openings in photo #1 from one solid piece of brass. The one cent piece provides some perspective to the size.
He purchases the gear wheels and adapts them so there isn't too much "play" when the gear teeth connect. But first he spends several hours calculating to get the right gear ratio. He explained the gearwheels together must equal 40 however the pairs needs to be something like this.: 10-30, 20-20 and 28-12 for example.
In photo #1 you see the largest gearwheel with 30 teeth and the smallest with 10 teeth.
Photo #3 showcases the various component parts in the suspension. You might enjoy to watch this video, at timestamp 1:25 you can view this unique suspension in action. Already at this stage, the chassis of the model truck can move in the same way in which one side of the truck can drive over a large obstacle while the entire truck stays upright. That is because of the unique "portal" axle and suspension system of the original Unimog trucks which this model replicates.
Only the shock absorbers (spring) and rubber tires were purchased. My husband designed and created all of the other components in brass and aluminium by individually milling and drilling them. He showed me how he needed to drill 6 holes each one millimeter in dimension in a precise distance to each other in order to attach the rim to the suspension sub-assembly for each wheel. When parts aren't attached with screws, he will solder them to fuse them together.
Photo #4 showcases some of the more advanced milling techniques used to create non-linear pieces out of metal such as the curves of the chassis frame (which is one single piece of brass per side) as well as the tanks which were made out of aluminium. The tiny holes in the chassis are one millimeter in diameter.
Only at this stage of model construction can you see the details. Once it is painted black and the rest of the truck is placed on top all of these incredible details will be hidden from view.
Now after reading these 2 blogs, you might think my husband has a degree in mechanical engineering, or experience in the automotive industry or works industrial design. But, that's not the case.
I believe he has a natural talent for all things mechanical and of course he has a passion for building functional Unimog truckmodels.