deflection wedge

deflection wedge

[di′flek·shən ‚wej]
(design engineering)
A wedge-shaped tool inserted into a borehole to direct the drill bit.
References in periodicals archive ?
The wedging procedure involves plugging the pilot hole with a mechanical wedge plug and then placing a deflection wedge on top of the wedge plug diverting the hole several degrees in a new direction.