Patent ID: 8736275

Claim:
A tool, comprising: at least one contact near a circumference of the tool; a grounded contact proximate to the at least one contact; at least one spring on an underside of the contact to provide an upward biasing force; an independently moveable inner cylinder or plate on the tool; and a computing infrastructure having executable code configured to calculate an angle of displacement of a wafer based on measured resistances of opposing branches of the at least one contact from a point of electrical contact with the wafer, wherein the at least one contact: is coupled to ammeters via low resistance connecting wires comprised of one of silver, copper, aluminum, gold and platinum, is at least one arc shaped contact and is made of one of Manganin, copper, platinum and aluminum, and is at least two contacts and the computing infrastructure calculates a centering alignment of the wafer on the tool based on a triangulation of contacts on a backside of the wafer and two of the at least two contacts, the at least one contact and grounded contact form a closed circuit when a contact on a back of a wafer bridges a gap therebetween, the independently moveable inner cylinder or plate is configured to lift, rotate and lower a wafer to adjust an alignment angle of the wafer, and the independently moveable inner cylinder or plate is controllable by a control.