<html><body><div style="font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000"><div>Hello all,<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>We have analyzed RICH mirrors 3 and 4 in AutoCAD using a similar method that which Marco shared on Friday.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Mary Ann and Pablo have been working on the analysis using the following procedure:<br data-mce-bogus="1"></div><ol style="list-style-type: undefined;"><li>Pablo imported the ideal model and CMM data into AutoCAD.<br data-mce-bogus="1"></li><li>Ideal model exploded to pull out the sides to analyze each separately (Four total files for the top, left, bottom, and right side of the model).<br data-mce-bogus="1"></li><li>Pablo rotated each side to lie in the x-y plane.<br data-mce-bogus="1"></li><li>Mary Ann took each file and fit circles around each CMM point where the radius of the circle is the CMM point's distance to the ideal plane.<br data-mce-bogus="1"></li><li>Mary Ann recorded the distance to the ideal plane for each CMM point.<br data-mce-bogus="1"></li></ol><div>Attached are two screen shots of the AutoCAD drawing for the top side of Mirror 3, one is a overall view of part of the side and the other a close-up of the data points. CMM points are in purple, the circles Mary Ann fit are in blue, and the ideal plane for the top side is in green.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>The recorded distances to the ideal plane are in the attached Excel file. Using the recorded distances to the ideal plane, we found the worst-case maximum deviation from the ideal plane and were able to draw the following conclusions in relation to the ideal model:<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>For Mirror 3:<br data-mce-bogus="1"></div><ul style="list-style-type: square;"><li>Mirror surface top and bottom are on the order of 750 microns bigger.<br data-mce-bogus="1"></li><li>Mirror surface left and right are on the order of 1500 microns bigger.<br data-mce-bogus="1"></li><li>Back surface top and bottom sides are on the order of 1000 bigger.<br data-mce-bogus="1"></li><li>Back surface left and right sides are on the order of 200 microns bigger.<br data-mce-bogus="1"></li></ul><div>For Mirror 4:<br data-mce-bogus="1"></div><ul style="list-style-type: square;"><li>Mirror surface top and bottom are on the order of 300 microns bigger.<br data-mce-bogus="1"></li><li>Mirror surface left and right are on the order of 1000 bigger.<br data-mce-bogus="1"></li><li>Back surface top and bottom are on the order of 800 microns bigger.<br data-mce-bogus="1"></li><li>Back surface left and right are on the order of 500 microns bigger<br data-mce-bogus="1"></li></ul><div>In summary, the CMM measurements for all sides of the mirror and back surfaces for both mirror 3 and mirror 4 support that the mirrors are slightly bigger than the ideal model. Further, the left and right sides for the mirror surface for both mirrors are the farthest from the ideal model's dimension.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Best regards,<br data-mce-bogus="1"></div><div>Tyler<br data-mce-bogus="1"></div></div></body></html>