Robot with wrist and end effector different materials

1. An apparatus comprising:

a robot arm comprising a wrist, where the wrist comprises a frame member, where the frame member comprises a first material having a first coefficient of thermal expansion; and

an end effector connected to the wrist at a connection, where the end effector is configured to support a substrate thereon, where the end effector comprises a first member and a second member, where at least one of the first and second members comprises a different second material having a different second coefficient of thermal expansion, where the connection comprises the first and second members being stationarily attached to each other with a portion of the frame member sandwiched therebetween, where the connection is configured to substantially prevent the different respective coefficients of thermal expansion to deflect the end effector relative to the wrist when the end effector and wrist are heated and/or cooled.

2. An apparatus as in claim 1 where the first and second members comprise an upper plate and a lower plate located against an upper surface and a lower surface of the portion of the frame member.

3. An apparatus as in claim 2 where the end effector comprises a member mounting plate located under the upper plate which extends between arms of the portion of the frame member.

4. An apparatus as in claim 1 where the connection comprises fasteners which extend between the first and second members, and through the portion of the frame member to stationarily attach the first and second members and the portion to one another.

5. An apparatus as in claim 1 where the second member comprises a substantially flat plate with fastener mounting holes therethrough.

6. An apparatus as in claim 1 where the second member comprises non-flat shaped plate having fastener mounting holes therethrough and at least one L-shaped portion.

7. An apparatus as in claim 1 where the portion comprises two forward extending cantilevered side portions which are fixedly attached to the end effector by fasteners, and at least one slot extending rewardly into the frame member in an area generally between the two forward extending cantilevered side portions.

8. An apparatus as in claim 7 where the at least one slot comprises at least two parallel slots forming a bridge member therebetween, where a front end of the bridge member comprises a fastener hole therein, and a fastener connects the front end of the bridge member to a member mounting plate of the end effector.

9. An apparatus as in claim 1 further comprising a drive portion connected to the robot arm.

10. A method comprising:

locating a portion of a frame member of a wrist of a robot arm between first and second members of an end effector, where the frame member comprises a first material having a first coefficient of thermal expansion, where the end effector is configured to support a substrate thereon, where at least one of the first and second members comprises a different second material having a different second coefficient of thermal expansion; and

providing a connection of the end effector to the wrist, where the connection comprises the first and second members being stationarily attached to each other with a portion of the frame member sandwiched therebetween, where the connection is configured to substantially prevent the different respective coefficients of thermal expansion to deflect the end effector relative to the wrist when the end effector and wrist are heated and/or cooled.

11. A method as in claim 10 where the first and second members comprise an upper plate and a lower plate, and where providing the connection comprises locating the upper plate against an upper surface of the portion of the frame member and locating the lower plate against a lower surface of the portion of the frame member.

12. A method as in claim 10 where providing the connection comprises a member mounting plate of the end effector, located under the upper plate, extending between arms of the portion of the frame member.

13. A method as in claim 10 where the connection comprises fasteners which extend between the first and second members, and the fasteners extend through the portion of the frame member to stationarily attach the first and second members and the portion to one another.

14. A method as in claim 10 where the second member comprises a substantially flat plate with fastener mounting holes therethrough.

15. A method as in claim 10 where the second member comprises non-flat shaped plate having fastener mounting holes therethrough and at least one L-shaped portion.

16. A method as in claim 10 where the portion comprises two forward extending cantilevered side portions which are fixedly attached to the end effector by fasteners, and at least one slot extending rewardly into the frame member in an area generally between the two forward extending cantilevered side portions.

17. A method as in claim 16 where the at least one slot comprises at least two parallel slots forming a bridge member therebetween, where a front end of the bridge member comprises a fastener hole therein, and a fastener connects the front end of the bridge member to a member mounting plate of the end effector.

18. A method as in claim 10 where further comprising connecting a drive portion to the robot arm.