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ODEX Eccentric Center Drill System
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Description:

ODEX is short for overburden drilling ECCENTRICITY. This is an improvement on the air circulation hammer. It is a wobble out of the eccentric bit to expand the casing at the bottom. The impact bit is composed of a concentric guide bit and an eccentric expanding bit.

The eccentric expanding bit swings outwards during drilling to enlarge the diameter of the hole. A guide device is arranged behind the eccentric bit, which is meshed with the special inner shoulder type casing shoe at the bottom of the ODEX casing. As the hole progresses, the ODEX is pulled down by the drill string. Cuttings are ejected through an annulus gap between the Guide and the casing shoe to a rotating device that directs the cuttings to the ground or to a sample collector.

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Specifications of ODEX eccentric center drill system
ODEX Type Recommended Casing Size Min. Wall Thickness Pilot Bit Diameter Reamer Diameter For Shanks of Hammer
Max. OD Min. ID
mm inch mm inch mm inch mm inch mm inch
90 115 4 1/2 102 4 6 15/64 90 3 35/64 123 4 27/32 DHD3.5, Cop34, Mission 30
115 142 5 19/32 125 4 59/64 7 9/32 115 4 17/32 155 6 7/64 DHD340A, SD4, QL40, Mission40
115 146 5 3/4 128 5 3/64 7 9/32 116 4 9/16 152 6
140 168 6 5/8 152 5 63/64 8 5/16 140 5 1/2 189 7 7/16 DHD350R, SD5, QL50, Mission50
144 178 7 160 6 19/64 9 23/64 144 5 9/16 192 7 9/16
165 196 7 23/32 183 7 13/64 6 15/64 166 6 17/32 211 8 19/64 DHD360, SD6, QL60, Mission60
180 219 8 5/8 194 7 5/8 6 15/64 179 7 3/64 232 9 1/8
190 219 8 5/8 205 8 1/16 7 9/32 191 7 1/2 236 9 19/64
190 219 8 5/8 205 8 1/16 7 9/32 191 7 1/2 236 9 19/64 DHD380, QL80, SD8, Mission 80
230 273 10 3/4 250 9 27/32 11.5 29/64 229 9 1/64 286 11 1/4
240 273 10 3/4 250 9 27/32 11.5 29/64 241 9 31/64 308 12 1/8
280 324 12 3/4 305 12 9.5 3/8 280 11 1/64 378 14 57/64 SD10, NUMA100
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☑ apered cross with conical pipe drilling perfect;
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☑ The drill bit is made of high quality steel and uses the most advanced CNC machinery and heat treatment process.
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