Top Hammer Button Bits_BOGO ENGINEERING (JIAXING) CO., LTD.

Flat-face bits are a general purpose bit that will perform in all rock conditions but should be used especially for hard or abrasive conditions like granite, basalt, and hard limestone. Flat-face bits are the best choice for drilling in abrasive rock.

ABRASIVE ROCK	PENETRATION RATE
MORE	SLOWER

Drop-center bits

Drop-center bits will help drill straighter holes in less consoli-dated rock.

ABRASIVE ROCK	PENETRATION RATE
MIDDLE	MIDDLE

Semi-dome bits

Semi-dome bits are designed for fast penetration rates in softer rock like shale and limestone with low silica content.

ABRASIVE ROCK	PENETRATION RATE
LESS	FASTER

CARBIDE SELECTION

CARBIDE DESIGN

The most fundamental decision when selecting different carbideconfgurations is profle shape.The most typical and commontypes are either a hemispherical or semi-ballistic carbide designand it's not uncommon to use other designs of carbide as well.Below are selections of basic designs which is offered by Rockopiaand special designs are also available.

CARBIDE CONFIGURATION

Most face designs for button bits are offered in multiple carbideconfgurations and typically differ in diameter, shape (i.e. profle)and quantity.There are some general guidelines to follow whileselecting between multiple carbide confgurations includingresistance to wear, penetration rate, vibration, and specifc rockconditions.

CONICAL

FULL-BALLISTIC

SEMI-BALLISTIC

CROWN-POINT

HEMISPHERICAL

MORE,SMALLERDIAMETER OF CARBIDE RESULTSIN FASTER PENETRATIONRATES, BUTSHORTER LIFE OFCARBIDE AND BIT.

FEWER, LARGERDIAMETER OFCARBIDE RESULTSIN SLOWERPENETRATIONRATES, BUTLONGER LIFE OFCARBIDE AND BIT.

SKIRT SELECTION

Retrac skirt

Designed to improve holestraightness, as well as to assistin retrieval of the drill string.The splines will also improvethe hole flushing characteris-tics of the bit due to the chipways between the splines.

Heavy duty skirt

A variation on the standardskirt design, available for veryabrasive conditions.The heavyduty skirt has added wearmaterial towards the front ofthe skirt to protect the bitagainst abrasive cuttings.