percussion bit

percussion bit

[pər′kəsh·ən ‚bit]
(mechanical engineering)
A rock-drilling tool with chisellike cutting edges, which when driven by impacts against a rock surface drills a hole by a chipping action.
References in periodicals archive ?
Use a percussion bit to drill the holes the same size as the anchor.
The main hole was then drilled through the cement and into open formation with a DTH hammer and percussion bit powered by a downhole motor.
When a percussion bit first starts to penetrate through a rock-joint surface at the hole bottom, for example, the gauge buttons tend to skid off this surface and thus deflect the bit.
How to Use: With a percussion bit the same size as the anchor, drill a hole directly through the wood or bracket and into solid concrete, concrete block or brick.