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I'm designing a bookcase to be fit into a bungalow as the image attached. The entire thing is made from MDF and weights collectively 180KG. There is a base cabinet sat on the floor, end panels sat on the floor, 25mm thick worktop sat on the end panels and cabinet and battens all around the...

i am working on a stacker trolley. This is basically a kind of manual forklift The lift is generated by a hydraulic jack that pushes a bar (frame) upwards, and pulls a trolley upwards via two bicycle type chains The chains are pinned into the main chassis by a pin with a tiny split-pin on each...