Mauna Loa Solar Observatory Observer's Log 
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Sat Sep 16 18:34:54 GMT 1995
Year: 95  Doy: 259
Observer: koon       console      Sep 16 18:33

WEATHER COMMENT: Sat Sep 16 18:35:00 GMT 1995
Voggy, thin cirrostratus, wind=5 mph from the East, temp=45 F.

Sat Sep 16 18:39:53 GMT 1995: Patrol Start

LOW-L COMMENT: Sat Sep 16 18:45:20 GMT 1995
Removed L00310 and installed L00312 in drive #0.

Sat Sep 16 19:01:02 GMT 1995: Calibration
Sat Sep 16 20:01:04 GMT 1995: Calibration

COMMENT: Sat Sep 16 20:33:52 GMT 1995
Extended dome slot.

Sat Sep 16 21:01:00 GMT 1995: Calibration
Sat Sep 16 22:00:56 GMT 1995: Calibration

WEATHER COMMENT: Sat Sep 16 22:03:55 GMT 1995
Orographic clouds starting to pass by, from the NE.


MKIII COMMENT: Sat Sep 16 22:22:40 GMT 1995
Since it is cloudy I had the cover off over the half-wave plate for the last
scan in an effort to examine the geartrain to see if it is OK, Eric noticed
that it is operating louder than usual.  I can hear the mechanism spinning
but nothing indicates a problem (e.g., metal chips, bearing squeal, wobbling
gears).  I have stopped observations and will investigate further.

Sat Sep 16 22:27:59 GMT 1995: Patrol End

MKIII COMMENT: Sat Sep 16 22:52:34 GMT 1995
I think the half-wave plate geartrain is fine.  There is some gear lash but
it doesn't seem unusual.  Manually rotating the gears shows that the cogs
look fine (even on the plastic gear) and that there are no sticky positions,
no noise evident either, I think the gears and bearings are fine.  Straight
cut gears such as those used are inherently noisy compared to helical gears
or chain drives, lubing the gears would cut the noise but create the possibility of optical contamination if the lube flies off those fast moving
gears.  Since the gears aren't under a high load or variable load situation
I wouldn't recommend lubing them unless they start to show signs of fast
wear, we can check the plastic gear now and then to see if the cogs are 
getting pointy.  I guess that the noise we here is caused by gear backlash
as the motor varies speed slightly to keep an even rotation of the half-wave
plate.


COMMENT: Sun Sep 17 00:10:15 GMT 1995
Activity report:
QP: 35-45; 67-82; 124; 223; 287; 315.
No coronal activity.

TAPES:
******
MKIII: H01117
DPMON: P00449
LOW-L: L00311 in drive #1

Sun Sep 17 00:55:55 GMT 1995: Filemark
SCAN-LOG 
SCAN-LOG  18:41:55.  9/16/95 DOY 259      
    18:46:43      18:49:56      18:53:07      18:56:18      18:59:29  
    19:02:42      19:05:54      19:09:07      19:12:19      19:15:31  
    19:18:42      19:21:54      19:25:04      19:28:17      19:31:29  
    19:34:45      19:37:55      19:41:07      19:44:17      19:47:28  
    1956 0 CL     20:00:55      2005 15CL     20:10:13      2015 0 CL 
    20:18:35      2022 15CL     20:27:58      20:34:54      20:38:06  
    20:41:23      20:44:35      20:47:46      20:50:56      20:54:07  
    20:57:16      21:00:28      21:03:38      21:06:49      21:09:58  
    21:13:09      21:16:19      21:19:30      21:22:39      21:25:50  
    21:28:59      21:32:09      21:35:18      21:38:28      21:41:36  
    21:44:48      21:47:56      21:51:05      21:54:14      21:57:24  
    22:00:32      22:03:47      22:06:56      22:10:05      22:13:15  
  0 ERRORS
OK