NASA's Curiosity Mars rover, which is currently engaged in its seventh sample-collection drilling of 2016, has developed some problem with a motor that moves its drilling equipment, and mission scientists have stopped driving or using its arm while they try to diagnose the problem.
Mission scientists have stopped driving or using its arm while they try to diagnose the problem. Curiosity is at a site on lower Mount Sharp selected for the mission's seventh sample-collection drilling of 2016.
NASA said Curiosity did not complete the commands for drilling as the rover detected a fault in an early step in which the ''drill feed'' mechanism did not extend the drill to touch the rock target with the bit.
''We are in the process of defining a set of diagnostic tests to carefully assess the drill feed mechanism. We are using our test rover here on Earth to try out these tests before we run them on Mars,'' Steven Lee, Curiosity deputy project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, US.
''To be cautious, until we run the tests on Curiosity, we want to restrict any dynamic changes that could affect the diagnosis. That means not moving the arm and not driving, which could shake it,'' said Lee.
According to Lee, the possible causes could be that a brake on the drill feed mechanism did not disengage fully or that an electronic encoder for the mechanism's motor did not function as expected.
The drill feed mechanism pushes the front of the drill outward from the turret of tools at the end of Curiosity's robotic arm. The drill collects powdered rock that is analysed by laboratory instruments inside the rover. While arm movements and driving are on hold, the rover is using cameras and a spectrometer on its mast, and a suite of environmental monitoring capabilities.
The rover has driven 15.01 kilometres since landing inside Mars' Gale Crater in August 2012 to reach the current location. Curiosity also climbed 165 metres in elevation since landing.
The rover is climbing to sequentially higher and younger layers of lower Mount Sharp to investigate how the region's ancient climate changed, billions of years ago. Clues about environmental conditions are recorded in the rock layers. During its first year on Mars, the mission succeeded at its main goal by finding that the region once offered environmental conditions favorable for microbial life, if Mars has ever hosted life.
''We still have percussion available, but we would like to be cautious and use it for targets where we really need it, and otherwise use rotary-only where that can give us a sample,'' said Curiosity project scientist Ashwin Vasavada at JPL.