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: http://www.naic.edu/~phil/hardware/vertex/gregorianweight.html
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The dome weight could be weighed by two different methods. These are
with jacks on each of the four corners or with a load cell lifted
from the azimuth feed arm top. On the week of Feb 27,2003, the
dome was weighed; first, with the jack and then with the load cell, I
should mention that when the jack's method is used the trolleys are
excluded. In order to determine the trolley's weight, several elements
were weighed during the yoke replacement project and the rest of the
weight was calculated. The total weight obtained for the trolleys
before the yokes modifications was 17,144 lbs. and after the yokes
modification 19,980 lbs.
As of 2/27/03 (jose's memo had 12/02/98 but i think that was a typo) the dome weight
was 215,390.4 with jacks and 215,660 with load cells. The attached
addendum A-1 has a break down of Dome weight per corner and a summary of
weight obtained with different methods and different dates. The dome
was at 1.05 degrees all day long during the measurements.
On 12/2/98 the dome weight with the jacks became 156,075 lbs. On 2/27/03 five (5) years later the weight from 12/2/98 to 2/27/03 is 59,315 lbs and the dome weight is 215,660 lbs.
date |
type |
Measure |
Notes |
corner1 |
corner2 |
corner3 |
corner5 |
2/27/03 |
Corner Weights |
Jacks |
without
trolley
weight |
18,768 |
19,872 |
79,488 |
77,280 |
with trolley weight (4995.6/corner) | 23764 |
24868 |
84484 |
82276 |
|||
load cell |
includes trolley weight |
34980 |
13060 |
85860 |
81760 |
||
Uphill |
Downhill |
||||||
Uphill/ downhill totals |
Jacks |
48631 |
166759 |
||||
load cell |
48040 |
167620 |
|||||
Total |
Jacks |
215390 |
|||||
load cell |
215660 |
||||||
|
|||||||
12/02/98 |
Corner Weights |
Jacks |
without trolley weight |
16305 |
6581 |
62418 |
53628 |
with trolley weight
(4286/corner) |
20590 |
10867 |
55704 |
57914 |
|||
Uphill |
Downhill |
||||||
Uphill/ downhill totals |
31457 |
124618 |
|||||
Total | 156075 |
The hydraulic brake was installed in jun02 on
the dome. Fits were done for torques moving uphill. One of the fit
parameters was the dome weight.(dome weight)
Date |
Measurement |
Dome
Weight (including trolleys) (kips) |
02dec98 |
Jacking the dome |
156075 |
25jun02 |
Gregorian motor torques |
208,000 |
27feb03 |
jacking the dome |
215390 |
27feb03 |
load cells lifting the dome |
215660 |