While the work on the HAM5/6 work platform was happening this morning, a part fell and knocked a viewport cover off. This hit the corner 3 horizontal Parker valve cover, and dented the aluminum cover and left a bit of yellow paint. I'm posting an image of the damage to the Parker valve cover. It's not small, but there are no fluid leaks and the dents are on the edge of the casing. Hugh is running some tests, he should post those soon.
Here are a couple trend plots of the IPS position sensors and the output drives to the actuators while doing strokes on the Y dof of +- ~50um. The positions of the IPS suggest all the actuators are moving the same amount to achieve the cartesian displacement request. The output drives are not the same for the four corners but each corner may have its own resistance from nominal isolated position and its own force coeffiecient. HEPI remains functional here.
We have spare parker valves on the shelf and maybe this should be changed in October if for no other reason than to clean off the yellow paint.
