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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
2
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

 

 

 

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