Patent ID: 8481969

Claim:
A method for warming a rotational interface in an ion implantation environment, the method comprising: providing a scan arm configured to rotate about a first axis and an end effector rotatably coupled to the scan arm via a twist motor and configured to selectively secure a workpiece, wherein the end effector is further configured to rotate about a second axis having a bearing and a seal associated with the second axis and twist motor, wherein the first axis and second axis are positioned a predetermined distance apart; activating the twist motor; performing one of reversing the rotation of the twist motor after a predetermined time and reversing the rotation of the twist motor when the twist motor faults; determining whether the rotation of the end effector about the second axis is acceptable; and reciprocating the scan arm about the first axis when the rotation of the end effector is unacceptable, wherein inertia of the end effector causes a rotation of the end effector about the second axis.