churn drill


noun

a portable drill rig using a bit fashioned on a massive steel cylinder that is alternately lifted and dropped to drill a hole in earth and rock.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for churn drill

  • This is a mechanical method and one form of apparatus employed is of the churn-drill type common throughout oil and coal regions.

    The Business of Mining|Arthur J. Hoskin