T

CUTTING STRUCTURE

B G REMARKS

Inner Rows

I

Gauge Row

G

Dull Characteristic

D

Location

L

Bearing

or Seal

Not Used Other Dull

Reason

Pulled

Cutting Structure

A measure of total cutting structure reduction due to lost, worn, chipped and/or broken inserts.

(I) - INNER ROWS - All rows not touching hole wall.

(G) - GAUGE ROW - Only the rows touching the hole wall.

In column (I) and (G) a linear scale of 0-8 is used to describe the condition of the cutting structure as follows: 
0- no reduction of cutting structure. 
8 - total reduction of cutting structure

(D) - Dull And ‘Other Dull: Characteristics

*BC - Broken Cone 
BT - Broken Teeth/Cutters 
BU - Balled up 
*CC - Cracked Cone 
*CD - Cone Dragged 
CI - Cone Interference 
CR - Cored 
CT - Chipped Teeth 
ER - Erosion 
FC - Flat Crested Wear 
HC - Heat Checking 
JD - Junk Damage 
*LC - Lost Cone 
LN - Lost Nozzle 
LT - Lost Teeth/Cutters 
PB - Pinched bit 
*PL - Plugged Bearings 
PN - Plugged Nozzle 
RG - Rounded Gage 
SD - Shirttail Damage 
ST - Shirttail
TR - Tracking
WO - Wash Out on Bit
NO - No Dull/No Other

(L) - Location

N - Nose Rows 
M - Middle Rows 
H - Gage Row 
GB - Gage Bevel 
A - All Rows

Cone # or #’s 
1

3

Bearing/Seals

AIR or OPEN BEARINGS - a linear scale from 0-8 is used to indicate the amount bearing life that has been used: 
0 - no bearing life used
8 - all bearing life used

Sealed Bearings

E - SEALED EFFECTIVE 
F - SEALS FAILED

Gauge

Not used for Blasthole.

Reasons Pulled

FM - Formation Change 
HP - Hole Problems 
HR - Hours on Bit 
PP - Pump Pressure (Air Pressure) 
PR - Penetration Rate 
RIG - Rig Repairs 
TQ - Torque 
TW - Twist Off 
WC - Weather Conditions

* Indicate Cone # or #’s under Location