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Expedition 330 Technical Reports
LOUISVILLE SEAMOUNT TRAIL
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LO–ALO Handover notes
Bill Mills, Cheih Peng & Heather Barnes
The following technical reports, cover both Expeditions 335 and the 335T.
Expedition 335 is the forth expedition to site U1256D (Superfast) in an attempt to deepen the hole into the cumulate gabbros section and beyond. Unfortunately, the majority of the drilling effort was spent stabilizing the hole, removing cuttings and retrieving parts of a failed bit. Only a few meters of core were recovered including large amounts of cuttings and numerous large boulders. The hole was logged and left in a clean, stable condition.
Expedition 335T was the transit from Balboa, Panama to Curcao (via the Panama Canal) where the ship will remain for approximately 3 month during an operational stand down period. The 335 science party and along with some technical staff, disembarked at Balboa, Panama. There we took on 4 guests, that included Dr. Chester Raymo (professor and science writer), his daughter Dr. Maureen Raymo (Paleoclimatologist, and past Co-chief Scientist), Wendy Jacob (freelance artist), and Amy Mayer (freelance reporter). They interviewed staff, wrote daily blogs (http://blog.sciencemusings.com/2011/06/aboard-jr.html) and gave evening talks.
The transit thru the canal was shared with IODP at College Station along with friends and family of the crew via web cameras along the canal route.
Operations Summary
On the 13th of April 2011, the technical staff from Expedition 334 crossed-over with oncoming technicians and then began routine logistic activities. The following day the scientist transferred from their hotel in San Jose to the vessel. The last line was released on 17 April at 04:20, and the vessel began transit to Site U1256.
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The expedition ended in Balboa, Panama on 3 June 2011. Throughout the expedition seafloor magnetic and bathymetry data was collected routinely on all transits. There were no seismic surveys or VSP operations.
After spending 2 days at anchorage taking on fuel, the JR began its transit of the Panama Canal at 07:45, 6 June and cleared the Colon breakwater at 16:15 on the same day. At 0945, 9 June the JR tied up at the Steiger Wharf 2, Caracas Bay, Curacao. On 10 June, Expedition 335 samples and data were offloaded and supplies for tie-up projects brought onboard.
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Core Description
Thomas Gorgas
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INTRODUCTION
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Physical Properties
Yulia Vasilyeva
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Summary
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P-mag Laboratory
Trevor Cobine
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Overview
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Engineering / Downhole Lab
Mike Meiring
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DHML
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ET Report
Jurie Kotze: Etienne Claassen
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Core lab
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CURATORIAL REPORT
Chad Broyles
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Summary
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IMAGING LAB
William Crawford
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SPECIAL PROJECTS
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Publications Specialist Technical Report
Tim Fulton
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Summary
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Chemistry Lab Technicians Report
Mike Bertoli, Chris Bennight (ICP-OES) and Erik Moortgat
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Overview...
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XRD Lab
Heather Barnes
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Summary:
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THIN SECTION
Edgar (Sandy) Dillard
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Summary
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*_\[McAneny, Jim\]_* |
Anyway, to use the auto-lap to get a comparative reading (but not exactly the same as the dial gauge due to a different diameter, a calibrated probe and running on a layer of abrasive):
1. Run system checks to 'home' the arm pillars
2. Use the 'setting tool' placed in the centre recess of the plate to position the roller arms by sitting test block in each arm in turn and sliding the outer diameter against the setting tool before tightening the lever.
3. Set the monitor on the master reference flat (with loading weight fitted) and use the monitor set up screen to press 'auto-zero'. This will remove any error offset in the monitor in the same way as you manually zero the dial gauge on the reference flat.
4. Place the monitor in the rear left smaller roller arm. with the load weight on top and the test block in the front right.
5. Use 9um or 15um particle size abrasive at 10-15% powder/water mix and 1-2 drips per second.
6. Run the system for 20mins at 70rpm and check the reading from the monitor as it runs. Initially the reading will change quickly and settle down after a few minutes.
7. As soon as the speed is started the monitor signal will be averaged for 30 seconds and then if the value is not withinh the target value (zero) then the arms will move in or out to the preset positions to change the plate shape towards the target. For example if the target is zero and the plate shape reading says 5um convex, the arms will move in to a position where the test block outer diameter is almost in line over the outer diameter of the plate and the main load of the test block has moved in to wear the centre area faster. If the plate shape is 5um concave then the arms will move outwards until the test block outer diameter is almost in line with the centre recess rim and the load of the test block will wear more or the outer area of the plate track.
8. If this is happening it may take another 4-5hours for the plate to be brought to zero as the cast iron slowly changes shape at ~1um/hour.
But for further clarification, you run the monitor, test block and the jig at the same time? Monitor in back left, test block in front right and jig where? or are you only running the monitor and the test block or the monitor and the jig?
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*_\[McAneny, Jim\]_* |
You should run the monitor and the jig when processing and the sections should wear the plate. If the material is soft the shape should hold steady, if hard the monitor will move the arms more often to keep correcting the plate shape around the target value. It can also be run with the test block but it will wear out faster if you use the test block all the time.
2] In normal operation, are the front right and back left the normal positions to run the jig and monitor respectively?
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*_\[McAneny, Jim\]_* |
Yes, the monitor is only for the rear left and the jig can run in any of the other three. Whichever is easiest to handle. I usually put the test block in the front left and if running one jig I use the front right.
I did find that this indeed did help me and moved the small arm into the stated position and this seemed to work better. In addition, that regularly checking the flatness monitor on the master flat seemed to be key to keeping the plate flat.
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FANTAIL
William Mills
The magnetometer was ran routinely without problems. VSP was cancelled due to lack of hole suitable for this type of logging. Ship's crew is currently planning on painting the deck in Curacao.
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Underway Geophysics LAB
Erik Moortgat
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Data Summary
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IT System Manager's Report
Grant Banta and Mike Hodge
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Summary
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DEVELOPER'S Report
Tim Blaisdale and David Fackler (Trevor Cobine, Chris Bennight and Wm. Mills,)
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_\[x334 off-going\] Dwight Hornbacher, Algie Morgan_ |
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