| ESI Mass Bal/ance Calc. | Note: Rotating Part of ESI (Does not include Cable Take-up) | |||||||
| M. Radovan 08/17/99 | Bold Items are Part of the Optical Instrument | |||||||
| Reg. text items are Electronics Boxes, Enclosure, etc | ||||||||
| Highlighted Item- Module provided by Keck | ||||||||
| ITEM | mass (kg) | W(lbs) | x | x * mass | y | y * mass | z | z * mass |
| module | 740 | 1628 | 0 | 0 | 0 | 0 | -3250 | -2405000 |
| mainframe | 250 | 550 | 0 | 0 | 0 | 0 | -3766 | -941500 |
| slit wheels | 216 | 475.2 | -138 | -29808 | -475 | -102600 | -2583 | -557928 |
| OSS (plates & struts) | 204 | 448.8 | -2.3 | -469.2 | 77 | 15708 | -2407 | -491028 |
| camera / cell | 137 | 301.4 | 15 | 2055 | 415 | 56855 | -3070 | -420590 |
| Box 1 | 120 | 264 | -477 | -57240 | 273 | 32760 | -3900 | -468000 |
| Cable Wrap (spool) | 82 | 180.4 | -81 | -6642 | -49 | -4018 | -4529 | -371378 |
| Box 2 | 80 | 176 | 582 | 46560 | 176 | 14080 | -3906 | -312480 |
| Box 3 | 80 | 176 | 0 | 0 | -716 | -57280 | -3925 | -314000 |
| mov. prism / cell | 68 | 149.6 | 0 | 0 | 155 | 10540 | -2745 | -186660 |
| box 1 Support | 48 | 105.6 | -512 | -24576 | 294 | 14112 | -3511 | -168528 |
| box 2 Support | 48 | 105.6 | 548 | 26304 | 244 | 11712 | -3504 | -168192 |
| box 3 Support | 48 | 105.6 | 0 | 0 | -632 | -30336 | -3488 | -167424 |
| skin (upper) | 45 | 99 | 0 | 0 | 0 | 0 | -2360 | -106200 |
| top housing frame | 38 | 83.6 | 0 | 0 | 0 | 0 | -2580 | -98040 |
| grating / cell | 35 | 77 | 15 | 525 | 140 | 4900 | -2130 | -74550 |
| collim. mir. / cell | 32 | 70.4 | 0 | 0 | -180 | -5760 | -4800 | -153600 |
| fix. prism / cell | 25 | 55 | 0 | 0 | 75 | 1875 | -2385 | -59625 |
| slit area str | 25 | 55 | 0 | 0 | 250 | 6250 | -2700 | -67500 |
| collim actuators | 24 | 52.8 | 0 | 0 | 0 | 0 | -4516 | -108384 |
| TV cam/lens/filter | 18.5 | 40.7 | 680 | 12580 | -286 | -5291 | -2530 | -46805 |
| lower skin& insul | 18 | 39.6 | 11 | 198 | -33 | -594 | -3831 | -68958 |
| coll pan | 18 | 39.6 | 0 | 0 | -134 | -2412 | -4779 | -86022 |
| dewar | 17 | 37.4 | 15 | 255 | 620 | 10540 | -3425 | -58225 |
| bay doors | 16 | 35.2 | 0 | 0 | 0 | 0 | -2360 | -37760 |
| imag. mirror / cell | 15 | 33 | 0 | 0 | -45 | -675 | -2623 | -39345 |
| ld mirror / cell | 15 | 33 | 0 | 0 | 80 | 1200 | -2215 | -33225 |
| hatch | 15 | 33 | 0 | 0 | -186 | -2790 | -1785 | -26775 |
| lower skin uprights (Al) | 9 | 19.8 | 6 | 54 | -97 | -873 | -4471 | -40239 |
| TV fold mirror | 5 | 11 | 5 | 25 | -45 | -225 | -1875 | -9375 |
| Enclosure+Inst. Total: | 2491.5 | 5481.3 | -30179.2 | -32322 | -8087336 | |||
| Max mass: | 2425 (LRIS) | 0 | ||||||
| CG (actual) | -12 | -13 | -3246 | |||||
| CG (required) | 0 | 0 | -3250 | |||||
| Optical Instrument | 1086.5 | 2390.3 | ||||||
| Elect. Boxes/ Enclosure | 665 | 1463 | ||||||
| Module Total: | 740 | 1628 | ||||||
| Subsystem Sum: | 2491.5 | 5481.3 | ||||||
| BALANCE OF ESI AND STATIC CABLE TAKE-UP SYSTEM: | ||||||||
| Support | 64.8 | 142.56 | -887.0 | -57477.6 | -552.0 | -35769.6 | -4157.0 | -269373.6 |
| Snout | 32.5 | 71.5 | -1555.0 | -50537.5 | -1275.0 | -41437.5 | -4592.0 | -149240.0 |
| tray(STEEL) | 39.1 | 86.02 | -2371.0 | -92706.1 | -1610.0 | -62951.0 | -3810.0 | -148971.0 |
| tray(ALUM.) | 27.0 | 59.4 | -2400.0 | -64800.0 | -1622.0 | -43794.0 | -3789.0 | -102303.0 |
| Moments | 2654.9 | -295700.4 | -216274.1 | -8757223.6 | ||||
| Total ESI And CABLE WRAP | 2654.9 | 5840.78 | -111.4 | -81.5 | -3298.5 | |||
| Dyno VALUE AT KECK | 3120 | 6864 | <--- WEIGHED Aug 18 1999 | |||||
| DELTA | 465.1 | 1023.22 |