Answer 1. Yes you are welcome to do shop drawings in English units. And we will only complain a little bit if you use English fasteners. But you still have to match the metric interface points to the telescope, and you still have to respect the metric tolerances.
Answer 2. The motors and the simple electrical controls are described in section 3 of the Technical Specification 401a022d. The idea is to have just a test cabinet for moving the motors back and forth and stopping them with the limit switches at the end of travel. The sizing parameters for the motors are described in Technical Report 727a010c.
Answer 3. These ties are meant to be made of the same material as the fabric cover. They are designed to limit the opening of the sectors.
Answer 4. Line "36" has been put on the list, to state that a fabric cover must be placed above the metallic frame. The purpose of the cover is to stop dust from entering either the hinges or the ends of the folding sectors. There is not a specific fabric layout drawing.
Answer 5.
Item 1: the dwg 727a048 contains 2 pieces
Item 2: the dwg 727a049 contains 2 pieces (Left-Right)
Item 3: the dwg 727a050 contains 2 pieces (Left-Right)
Item 15: the dwg 727a061 contains 2 pieces (Left-Right)
Answer 6. We think it is complete. Please send specific remarks, if any.
Answer 7. Yes, we are open to the proposal of an alternate hinge system. But make sure that the alternate system is similar in function, in stiffness and in smoothness of motion.
8b) Where does item #2 go?
8c) The travel is 12192 on each side, what happens at the ends, is there a stop?
8d) Have the holes already been placed in the cell?
8e) Is the 25.4 mm pitch set? That is not a standard chain link 1mm less is.
Answer 8.
8a) The short space (101.6) occurs where the two chains meet. Zoom in
near the sprockets on the left side of drawing 727a072a to see this.
8b) Item 2 is the support bracket for the chain, it must be supplied and it will be attached to the cell (by the customer).
8c)There are electrical limit switches. Mechanical stops can be added if needed: specific tailoring must be foreseen at factory testing.
8d) The mounting holes for the chain mounting brackets have not yet been placed in the cell.
8e) An equivalent standard chain could be implemented keeping the same gearing ratio and other design parameters. (We still think a 1-inch chain has a 25.4 mm pitch.)
Is this what you have in mind? How did you intend for the fabric to be attached to the st.st. fan covers and is the ends covered and how do you see that folding up with the st.st. fan covers.
Answer 9.
Yes, that is the general idea.
The thickness is OK (it must be < 0.4mm).
The fabric must be attached to the metallic cover; no specific design has
been finalized.
Answer 10.
Item 2 drawing 727a030 is the first sector fixed to the fixed arm.
Item 3 drawing 727a031 is the last sector fixed to the moving arm.
These 2 drawings depend on the hinge design that will be adopted. They have
not been drafted.
Answer 11. The BOM is in the left lower side.
Answer 12.
Item 16: OK see the updated drawing which is available on the web..
Item 36: OK see the updated drawing which is available on the web.
727a011c
See also the updated drawing.
727a045b
Answer 13. This is an impregnated bushing. (I haven't been able to translate "glissa".)
Answer 14. These are the italian general construction tolerances for steel structures. You may propose an equivalent US standard.
Answer 15. The second cell has not been sent to the mountain. It is still in the Mirror Lab in Tucson. However, the schedule of the second cell is quite tight, so it seems unlikely that using the second cell to test the mirror cover will be practical.
However, we are always willing to discuss creative alternate proposals.