button bit

button bit

[′bət·ən ‚bit]
(design engineering)
A drilling bit made with button-shaped tungsten carbide inserts.
References in periodicals archive ?
Called the type 68, this button bit design has a better service life and better penetration rate than other manufacturers' bits in hard rock applications.
Comparing the COP 1838 with its own COP 1238, known to offer an average net penetration capacity of 1.7 m/min in hard rock using a 45 mm button bit, Atlas Copco reports that extensive field testing over two years has verified that the COP 1838, together with the new ECS electrical control system, on average is capable of: