We made this projection sphere with a diameter of almost 3 m from GRP for the Deutsches Museum in Nuremberg. It was made of four segments and mounted on the 8 m high concrete ceiling on site.
First, a mould had to be milled for a ¼ sphere segment. This shape was then moulded with GRP in a thickness of 4 mm. Each of the four spherical segments has an inner flange so that they could later be screwed together. A mounting hole with a diameter of 450 mm was provided.
To suspend the sphere, three chains are attached to the sphere to prevent it from swinging back and forth. Three movable eyebolts were mounted on the ceiling to suspend the sphere at a distance of 2 metres from the ceiling. Lifting chains, according to DIN EN 812-2 quality class 8 with a load capacity of 1,120 kg, were used for the fastening.
The sphere was painted in RAL 7035. And weighs approx. 300 kg.
The projection sphere is intended as an oversized globe in the exhibition area “System Earth”. By means of projection from 10 beamers, a simulation of the earth with its oceans, landscapes and cloud fields will be created.