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Agenda  Preliminary Agenda: 1. Overview - schedule and plan (chris) 2. Tradiational thin section preparation (skok and jim) 3. Epoxy, self-supported thinsection,

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Presentation on theme: "Agenda  Preliminary Agenda: 1. Overview - schedule and plan (chris) 2. Tradiational thin section preparation (skok and jim) 3. Epoxy, self-supported thinsection,"— Presentation transcript:

1 Agenda  Preliminary Agenda: 1. Overview - schedule and plan (chris) 2. Tradiational thin section preparation (skok and jim) 3. Epoxy, self-supported thinsection, and support concepts (cbd) 4. Sectioning stage with diamond wire (steele) 5. Profilometer results (chris) 6. Thin section grinder (kris zacny) 7. Requirements discussion (chris and all)

2 Traditional Sectioning Methods  Jim, talk about slicing with Skok  Drawback being it takes a lot of power, large amount of dust generated, and it would take a 12” diameter blade to cut a 5” rock  …. Which leads us to diamond wire

3 Diamond Wire Tech A summary of what we have learned from our visit. Special thanks to Cynthia Christianson for all the help and expertise.

4 Wire characteristics  Small size (.006”-.012” diameter)  Expect low energy requirements  Little material loss (kerf = wire diameter +.001”)  Small amount of debris generated from cut  Excellent flatness capabilities A Microphotograph of Diamond Wire Cross-Section of Diamond Wire http://www.diamondwiretech.com/diamond_wire/diamond_wire.html

5 Tangential Cutting  Reduced cut time  Must determine if cut time reduction is worth the energy requirement  Allows for a higher quality cut (less drift)  Patented by DWT

6 Process Quality http://www.diamondwiretech.com/process/process.html

7 Capstan Wire Guide  Capstan holds short wire lengths (100’ held on ~3” OD x 5” length shown above  Maintains wire integrity better than reel to reel system  Larger package than reel to reel  Reverses cutting direction every 5 sec  Fairly simple to rethread wire in case of a break

8 Reel to Reel Wire Management  Holds long wire lengths (2 km) that runs between two reels  Wire wears faster because it lays over itself  More compact package overall  Cutting direction reverses less often (~30 sec – 90 sec?)  Slightly more complicated to re-thread wire in case of a break

9 DWT Cutting Control  Wire tension is maintained with air pressure (set to ~15 psi)  The wire is programmed to cut at a set rate OR at a set rate with bow no greater than θ˚ (Typically 3˚)  Downward cutting force is less than 1 lb which allows us to use a light holding force on the rock  Low cutting forces cause rock to resemble ground rock face finishes

10 Wear Items  Pulleys will need to be replaced after ~250 hours of use (AL hub stays, neoprene V guide slides over hub)  Wire tends to break from bending stresses, not wear of diamond.

11 Preliminary Concepts  Insert various solidworks sketches

12 Questions  Do you have a preferred delivery method for receiving the cubic? In a container, a “vise” on a stage, with robotic manipulator?  How do you plan to hold this for grinding?  Are there temporary epoxies, tapes that could be used or reused? I believe C Dreyer mentioned something about this.  If we are to do this without a slide, doesn’t that limit you to boring into our cubic to create the thin section?  What materials are you looking at to do the grinding?  If we wanted to collect dust from cutting to analyze there would be very little from the diamond wire. Would we be able to rely on the rover to pull a dust sample from the ground?

13 System Requirements  Minimal consumables (epoxy, wire, guides, etc.)  Low Power Usage per function (quantify?)  Least Mass Possible to do the job  Fewer moving parts means fewer broken pieces  Robust enough to last for X-months or X-many sections?  No fluids, all electromechanical  Must be able to function at ~40 Kelvin? Would we be able to simulate anything near that?


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