Plate

grabcad

Mass = 84184.05 gramsVolume = 31179276.94 cubic millimetersSurface area = 1916449.49 square millimetersMaterial is 1060 Alloy.I started out by sketching a central rectangle, 200mm by 85mm, and just trim it horizontally in half. Then, create another rectangle on top of the first, 30mm wide by 390mm tall. Trim the bottom of the last created rectangle, so the 2 become 1 figure. Then create another rectangle, 65mm wide and 45mm tall, connecting the right side of it to the 2nd created rectangle. Trim the bottom right side to join with the rest of the shape, trim the top as well, to create a 20mm long line and then randomly place a line slightly at an angle, and place another one, connected it to the right side of the rectangle. Using the smart dimensions, measure the length from the top point of the 1st angle and the bottom of the 2nd angles line, it should equal 25mm. The first top angled line should be 15 degrees, while the 2nd angles line should be at 24 degrees. Finally, the sketch can be revolved. Start another sketch on the inner front face, create a vertical center line, sketch the middle circle, and the next biggest one (radius 445mm), just so it's easier to later extrude the next parts. Construct 2 lines, so the center line is in-between them, make sure the distance from each line to the center is 20mm, trim the parts outside of the bigger circle and the parts inside the smaller circle, and extrude the 2 parts of the line to 25mm. Apply 10mm fillets to the bottom edges and one top right edge, the top left edge has a fillet of 60mm. Afterwards, use circular pattern to create 9 of those parts around the circle (make sure to include all features and faces of the part).