MAESTRO Proceedure: Dismounting the spectrograph from the alignment frame

Last modification: Nov. 29, 2007

Having 4 people makes the tedious part of the procedure go quickly.

Equipment needed

¾ inch wrenches for each person.

1/2 inch bolts 2 inches+

1/2 inch washers

1/2 inch nuts

Six lengths of 5/8 inch allthread attached with nuts and washers in all but the two inner weldment attachment locations

Level

Procedure

1. Remove the dewar and secure cables out of the way.

2. Roll the cart under the weldment and roughly align the cart to match up the four attachment wings on the spectrograph. The 4 weldment attachment wings should be to the grating side of the cart attachment wings.

3. Remove allthread to the two wings on the inner side of the weldment that are difficult to reach. Use double nuts and washers at other locations.

4. Raise cart allthread with top block under the instrument until it is snugly against the weldment. Check positioning of the cart/weldment for hooking up the wing bolts

5. Loosen all but 4 of the weldment allthreads all of the way.

6. Chuck the wheels of the cart so it doesn’t move.

7. Once the Cart allthread is tight under the weldment, slowly loosen the remaining instrument allthreads so the weight is resting on the cart allthreads. Keep these bolts with approximately a 1 inch gap for emergency backup while lowering.

9. With personnel at each of the 4 cart all thread locations, slowly lower the weldment from the alignment frame in ½ turn increments simultaneously.

10. After each 1 inch of movement, check to see that the spectrograph is staying level as lowered. Measure the distance between the weldment and alignment frame at all points with a ruler.

11. When the weldment is approximately 2 inches above the cart top, check the alignment of the cart to the weldment and adjust if necessary by relieving weight on the cart with frame bolts. Check clearance of instrument at dewar and grating end with respect to the cart

12. Continue lowering by ½ turn increments checking alignment with holes, and clearance at the bottom of the instrument. Insert bolts loosely as holes line up to the very top of the slotted hole.

13. Wiggle cart and wedge as necessary until all bolts installed.

14. Tighten all 8 bolts to attach the spectrograph to the cart.

15. Remove allthread, reassembling hardware together as removed.

16. Store hardware in appropriate box

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