Rotary drill bit having an insert with leading and trailing reli

Details Rotary drill bit having an insert with leading and trailing reli Rotary drill bit having an insert with leading and trailing reli

1995-04-13

1995-11-21

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

1754202, E21B 1046

Patent

active

054678374

ABSTRACT:
A roof drill bit having a tool body with a cutting insert brazed thereto. The cutting insert has opposite leading and trailing face portions joined by a side surface which has a leading side relief portion adjacent the leading face portion and a trailing side relief portion adjacent the trailing face portion. The trailing side relief portion, which extends from the leading face portion a distance equal to between about one-third to two-thirds the thickness of the insert, has a greater relief angle that the leading side relief portion, which extends from the trailing face portion a distance equal to between about one-third to about two-thirds the thickness of the insert.

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Fairhurst, "The Design of Rotary Drilling Bits" (undated).

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