(no subject)

From: Kurtis Anliker (Hughes Air Warfare Center)
Date: Wednesday, February 1, 1995

From: Kurtis Anliker (Hughes Air Warfare Center)
To: RP-ML
Date: Wednesday, February 1, 1995
This message is for the SLA users hanging on the wire.

We have been troubleshooting a problem with our SLA-250
for a while, and I was wondering if anyone else has/is seeing
similar things.  We have a 1990 series SLA-250 which was upgraded
with the Process Chamber Upgrade followed by the 486 controller
upgrade.  We are running the SL5170 material for ACES and Quickcast
parts and decided to get the High Powered laser when our last laser
died.

The problem we have been seeing can be seen in the build.log file
3D writes out which contains what was built and will also record laser
fluctuations (>10% I believe) and sweeper blade collisions (if they are 
severe
enough to set off the sensors)  what we are seeing in our build.log file 
looks
like the following:

Mon 01/30/95 09:38a START C:\WORK\B1_174_1
Mon 01/30/95 01:14p Layer 816; Sensor #2 59mW to 41mW
Mon 01/30/95 01:14p Sensor #2 59mW to 41mW
Mon 01/30/95 01:15p Profiling error -- profiler #2 may be blocked; Power 42 
59
Mon 01/30/95 01:15p Initiating a Full Find on the profiler
Mon 01/30/95 01:15p Full Find on the profiler yielded a power of 40.

We have had cases where this these messages will add 3-5 pages to the 
build.log
file.  The interesting thing, however; is that the parts coming out of the 
machine look
good, like nothing was wrong.

I would like to know if we are the only ones out here seeing this, or if 
there are others
who are seeing it and don't realize it, or did not even know it existed.  My 
opinion is
that it can be a major cause of concern.  Remember the Users Group meeting 
in Atlanta
(2 years ago) and the discussion on how important for both sensors to be 
within a mW of
each other on what they were reading.

If anyone else out there is seeing these types of things happening (probably 
with similar
history as ours in paragraph #1), I would be very interested in knowing.

Thanks
Kurt Anliker
Naval Air Warfare Center, Indianapolis


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