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Supplement to Dewar Alignment Checking Procedures

Figure 1 shows a puck lid with the dewar alignment token inserted into well 11. The larger diameter portion of the token matches the well diameter (0.484"; 12.29 mm) and depth (0.120"; 3.05 mm) with close tolerance. The smaller diameter of the token matches the base diameter of a Hampton ALS cap (0.470"; 11.94 mm).

Figure 2 shows the gripper with with an ALS cap in its collett docked to the alignment token in well 11. It is perfectly aligned on the vertical gripper axis as can be seen by the concentricity of cap and token. Visual inspection of this alignment is difficult in the the reflective metallic surroundings, but it can readily be tested by probing with a fingernail or with the edge of a plastic ruler. Each well must be aligned to the gripper axis with a precision of about 0.2 mm, which is about half of the width of the taper on a well rim (0.5 mm).

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