College of Optical Sciences The University of Arizona 1 APOMA Fall 2008 Workshop 11/17-11/18/08 Stages and rotary tables

College of Optical Sciences The University of Arizona 2 APOMA Fall 2008 Workshop 11/17-11/18/08 Linear stages Examine various types Note key components Measure pitch and yaw with PSM How to avoid damage to stages How to fix if damaged

College of Optical Sciences The University of Arizona 3 APOMA Fall 2008 Workshop 11/17-11/18/08 Types of linear stages Recirculating ball on ground rod Dovetail slide Ball in V groove or pair of cylinders Sliding wedge Scissor jack Flexure

College of Optical Sciences The University of Arizona 4 APOMA Fall 2008 Workshop 11/17-11/18/08 Types of nuts or actuators Recirculating ball Pre-loaded nuts and thrust bearings Micrometer and spring Fine pitched screw, brass nut and grease Plain nut of plastic material Servo or picometer

College of Optical Sciences The University of Arizona 5 APOMA Fall 2008 Workshop 11/17-11/18/08 Tilt stages Gimbel type pivots Corner pivot 2 or 3 degree of freedom Goniometer stage – virtual pivot Preload – spring or magnet

College of Optical Sciences The University of Arizona 6 APOMA Fall 2008 Workshop 11/17-11/18/08 Rotary stages Air bearing (or oil hydrostatic) –Rotary linear motor plus encoder disk Ball or crossed roller Solid mechanical and grease –Worm gear driven –Encoder is the worm drive

College of Optical Sciences The University of Arizona 7 APOMA Fall 2008 Workshop 11/17-11/18/08 Avoid damaging stages Shock like dropping, removing actuator Screws that are too long when mounting Jamming into stop at end of travel Trying to move when stage is locked Loads & moments that are too large Contamination, rust & no lubrication Leaving springs in stretched position

College of Optical Sciences The University of Arizona 8 APOMA Fall 2008 Workshop 11/17-11/18/08 Fixing stages Loosen gibs – screws along way Retighten to get uniform feel over travel Keep ways and screws clean Lubricate ways and screws Use spanner to rotate micrometers Don’t loosen too much & loose balls

College of Optical Sciences The University of Arizona 9 APOMA Fall 2008 Workshop 11/17-11/18/08 For the lab Stages are labeled Identify and note details of main components Move stages and feel stiffness of adjuster Note backlash or lost motion on each Note how gibs are adjusted Note center or rotation for tilt stages Figure out scale reading on large rotary table Note how hexipod works