For a large customer, K&W Transmissies produced two hub extensions with a diameter of 670 mm, of which the hubs and the disk had to be produced from solid material. For this piece of steelwork we bought two pieces of steel weighing 520 kg each! During the rough turning on one of our high-quality CNC machines, in which the large hub on the one side and the small hub on the other side and the bore were bored, 345 kilograms of shavings came out. Eventually, after the holes were milled on the pitch circle and a spline toothing was applied, the sprockets still weighed another 175 kilos each. The high tolerance requirement of the customer was the reason the sprockets were milled in this way. Due to high accuracy, the tolerance limit was only 0.005 mm; hence it could not be a welded construction.
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