Curiosity maneuver prepares for drilling

Jan 29, 2013 by Guy Webster
The percussion drill in the turret of tools at the end of the robotic arm of NASA's Mars rover Curiosity has been positioned in contact with the rock surface in this image from the rover's front Hazard-Avoidance Camera (Hazcam). Credit: NASA/JPL-Caltech

(Phys.org)—NASA's Mars rover Curiosity has placed its drill onto a series of four locations on a Martian rock and pressed down on it with the rover's arm, in preparation for using the drill in coming days.

The rover carried out this "pre-load" testing on Mars yesterday (Jan. 27). The tests enable engineers to check whether the amount of force applied to the hardware matches predictions for what would result from the commanded motions.

The next step is an overnight pre-load test, to gain assurance that the large temperature change from day to night at the rover's location does not add excessively to stress on the arm while it is pressing on the drill. At Curiosity's work site in Gale Crater, air temperature plunges from about 32 degrees Fahrenheit (zero degrees Celsius) in the afternoon to minus 85 degrees Fahrenheit (minus 65 degrees Celsius) overnight. Over this temperature swing, this large rover's arm, chassis and grow and shrink by about a tenth of an inch (about 2.4 millimeters), a little more than the thickness of a U.S. quarter-dollar coin.

The rover team at NASA's Jet Propulsion Laboratory, Pasadena, Calif., sent the rover commands yesterday to begin the overnight pre-load test today (Monday).

"We don't plan on leaving the drill in a overnight once we start drilling, but in case that happens, it is important to know what to expect in terms of stress on the hardware," said JPL's Daniel Limonadi, the lead for Curiosity's surface sampling and science system. "This test is done at lower pre-load values than we plan to use during drilling, to let us learn about the temperature effects without putting the hardware at risk."

Remaining preparatory steps will take at least the rest of this week. Some of these steps are hardware checks. Others will evaluate characteristics of the at the selected drilling site on a patch of flat, veined rock called "John Klein."

Limonadi said, "We are proceeding with caution in the approach to Curiosity's first drilling. This is challenging. It will be the first time any robot has drilled into a rock to collect a sample on Mars."

An activity called the "drill-on-rock checkout" will use the hammering action of Curiosity's drill briefly, without rotation of the drill bit, for assurance that the back-and-forth percussion mechanism and associated control system are properly tuned for hitting a rock.

A subsequent activity called "mini-drill" is designed to produce a small ring of tailings—powder resulting from drilling—on the surface of the rock while penetrating less than eight-tenths of an inch (2 centimeters). This activity will not go deep enough to push rock powder into the drill's sample-gathering chamber. Limonadi said, "The purpose is to see whether the tailings are behaving the way we expect. Do they look like dry powder? That's what we want to confirm."

The rover team's activities this week are affected by the difference between Mars time and Earth time. To compensate for this, the team develops commands based on rover activities from two sols earlier. So, for example, the mini-drill activity cannot occur sooner than two sols after the drill-on-rock checkout.

Each Martian sol lasts about 40 minutes longer than a 24-hour Earth day. By mid-February, the afternoon at Gale Crater, when Curiosity transmits information about results from the sol, will again be falling early enough in the California day for the rover team to plan each sol based on the previous sol's results.

NASA's Mars Science Laboratory Project is using Curiosity to assess whether areas inside ever offered a habitable environment for microbes. JPL, a division of the California Institute of Technology in Pasadena, manages the project for NASA's Science Mission Directorate in Washington.

Explore further: NASA Webb's heart survives deep freeze test

add to favorites email to friend print save as pdf

Related Stories

Curiosity rover explores 'Yellowknife Bay'

Jan 07, 2013

(Phys.org)—After imaging during the holidays, NASA's Mars rover Curiosity resumed driving Jan. 3 and pulled within arm's reach of a sinuous rock feature called "Snake River."

Curiosity rover explores 'Yellowknife Bay'

Dec 20, 2012

(Phys.org)—The NASA Mars rover Curiosity this week is driving within a shallow depression called "Yellowknife Bay," providing information to help researchers choose a rock to drill.

Mars rover Curiosity uses arm camera at night

Jan 24, 2013

(Phys.org)—NASA's Mars rover Curiosity has for the first time used the camera on its arm to take photos at night, illuminated by white lights and ultraviolet lights on the instrument.

One year after launch, Curiosity rover busy on Mars

Nov 27, 2012

(Phys.org)—The NASA Mars rover Curiosity began its flight to Mars on Nov. 26, 2011, from Cape Canaveral Air Force Station, Fla., tucked inside the Mars Science Laboratory spacecraft. One year after launch ...

Recommended for you

NASA Webb's heart survives deep freeze test

4 hours ago

After 116 days of being subjected to extremely frigid temperatures like that in space, the heart of the James Webb Space Telescope, the Integrated Science Instrument Module (ISIM) and its sensitive instruments, ...

MAVEN studies passing comet and its effects

11 hours ago

NASA's newest orbiter at Mars, MAVEN, took precautions to avoid harm from a dust-spewing comet that flew near Mars today and is studying the flyby's effects on the Red Planet's atmosphere.

How to safely enjoy the October 23 partial solar eclipse

11 hours ago

2014 – a year rich in eclipses. The Moon dutifully slid into Earth's shadow in April and October gifting us with two total lunars. Now it's the Sun's turn. This Thursday October 23 skywatchers across much ...

How to grip an asteroid

12 hours ago

For someone like Edward Fouad, a junior at Caltech who has always been interested in robotics and mechanical engineering, it was an ideal project: help develop robotic technology that could one day fly on ...

User comments : 0