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I am looking for a simple robot arm - without any sensor or hand - that would be able to move from side to side in a "Union Jack" pattern (up - down, side to side, and the two diagonals) and a few other linear movements in other planes. The end of the arm is to acts as a focal point.
The application of it is such that a person is sitting in front of the arm - looking at its end, while it is moving. The movement is either in a plane in front of the person (like if you had a computer screen in front of you, but since we need to a range of +/-50 degrees right left and 20 up and 30 degrees down at a 40 cm distance, it would have to be rather large - thus too expensive expensive).Also, we need the arm to move to and from 50 cm to 2 cm distance along a line from between the person's eyes and outwoards approx 0 - 10 degrees down. The apparatus (arm or whatever) should not bee prohibitatively expensive to produce, and should not block cameras standing behind the arm, acting as eye trackers.