MK Diamond MK-MANTA III - Manual (Page 17)

17
TROUBLESHOOTING
PROBLEM WHAT TO DO? INDICATION CAUSE SOLUTION/
RECOMMENDATIONS
Low Pen-
etration
Rate Under
Prevailing
Drilling Pa-
rameters.
1. Check fluid return. Fluid not muddy.
Evidence of steel
cuttings.
Drilling in steel
reinforcement.
Adjust drilling parameters to
recommendations for reinforce-
ment.
2. Check motor
speed range.
Speed not cor-
rect for the bit
size used.
See recommended speeds.
3. Check wear
picture of bit face.
Bit worn out Replace with new bit.
Diamond without
exposure. (flush
with bond matrix)
Insufficient bit
load.
Increase bit load.
Rotated with high
RPM on rein-
forcement
Reduce RPM, or resharpen bit.
Loose material at
bottom of hole.
Break core, clean bottom of
hole or reduce RPM and drill
with increased bit load.
Face of bit
plugged with cut-
tings
Not enough fluid
pumped. Cut-
tings burnt to
matrix. Diamonds
prevented from
cutting.
Clean bit face by sharpening
methods such as drilling dry at
low RPM in a concrete block
3/8” deep max. Increase water
flow rate.
Face of bit cov-
ered with steel.
Steel cuttings
stick to bit face.
Steel cuttings
stick to bit face.
Diamonds pre-
vented from
cutting.
Clean bit face by drilling in
abrasive concrete block. Re-
duce RPM.
Wear picture of
polished dia-
monds.
Bit load too low. Increase bit load.
Bit speed too
high
Use lower speed; increase bit
load.
Heavy
Wear at
Steel Tube
Deep grooves. Worn or open
guide ways on
cradle. Borehole
is getting undu-
lated.
Adjust guidance on carriage.
Protruding steel.
Spindle is offset.
Bit out of true.
Adjust guidance on carriage.
Nicks or dirt on mounting faces.
Heavy Wear. Bit is deformed. Replace bit.
Poor cleaning of
abrasive cuttings.
Improve flushing.
Crown clearance
worn out.
Replace bit.
MANTA CORE DRILL III TROUBLESHOOTING