What is a subframe?

A short excursion into vehicle construction. A truck usually consists of two long steel rails stabilised by cross members. All parts are attached to these two rails. To cope with uneven ground, this frame can twist and keep the wheels on the ground. Because of this twisting, however, it’s not possible to mount a relatively fragile GRP box directly onto the frame – the box would simply be destroyed.

So to prevent forces from the frame being transferred into the GRP box, a stiff steel frame is installed between chassis and box. When the truck’s frame twists, the subframe lifts off the chassis and prevents those forces from being transferred. It’s important to design this frame strong enough for how the truck will later be used – otherwise it can break and destroy the box.

Using a forklift, one wheel was lifted to simulate the truck twisting off-road. This test was the basis for the rest of the build.

Many thanks to Bernhard “Rahmenmeister” for his great help and advice! Here’s his Instagram account: https://www.instagram.com/rahmen_meister/

to be continued

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