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Start of Shift Equipment Pre-op Start up Pattern Set-up Unusual Conditions End-of-shift Transporting drill Drilling
1. Start of Shift
Clock in at scalehouse
Talk to supervisor
Get instructions
Hole depth
Drill location
Amount of drilled holes
Discuss Ground hazard analysis
Tool box meeting
Safety issues
Productivity issues
Enter Sub-topic
Conduct site inspection/workplace exam
Loose materials
Document completion of inspection/exam
Imminent danger issues
Fall hazards
Obtain necessary fall protection equipment
Obtain necessary supplies
Drill rock oil
Hydraulic and motor oil
Brake fluid
Brake cleaner
Ear plugs
Dust mask (in bulk)
Safety glasses
Penetrating oil
Conduct Part 46 Training
2. Equipment Pre-op
Check oil levels
Check transmission fluid (Dextron 3)
Check anti-freeze
Check guards
Check straps and hoses
Check tires
Check for fluid leaks
Check battery
Check chocking/blocking
Check hose couplings for safety ties/retainers
Compressor and alternator
Check oil level
Check hydraulic fluid level
Check rock drill oil level
Check water level
Check hydraulic and air hoses
Check tracks
Loose bolts
Wear and tear
Track tension
Make any necessary adjustments
Check drill mast
Centralizer assembly
Rod retainer
Air hoses
Hydraulic oil hoses
Rod couplings for cracks
Check rods
Drill bits for wear and tear
Check striking bar/hammer
Wear and tear
Leaks (air, water)
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Check drifter
Wear and tear on guide
Check steering
Check for cracks in frame, etc.
3. Start up
Press down on by-pass
Hold by-pass for 20 seconds
Turn ignition key on
Let idle
At least 10 minutes in cold weather
At least 5 minutes in warm weather
Check compressor gauges
Air pressure
Aprx. 40 psi at startup
120 psi working
Oil pressure
40 psi
Air temperature
Check on max
Water temperature
180 - 200 degrees
Turn air solenoid switch on to drill
Look/listen for air leaks
Enter Sub-topic
4. Pattern Set-up
Check area
Ground Hazard Analysis
Level area if needed
Remove berms/boulders if necessary
Place necessary signage
Restricted/blasting area, etc.
Check with supervisor
Number of holes, depth, spacing, burden
Driller determines pattern
Consult with supervisor
Consider wall angle and toe for first line
Try to keep pit bottom level for haulage operations
Square pattern off
Measure off drill hole pattern
Use stemming pole or tape measure
Measure first and second rows
Begin drilling with second row
Second row will be used for fall protection
Drilling subsequent rows
Measure off as needed to keep rows as straight as possible
The closer the holes are, the finer the shot rock will be
The farther apart the holes are, the larger the shot rock will be
Always recheck holes
5. Unusual Conditions
Water in holes
Check holes for water
Could result in overloading and/or bad shot
Over six inches of water
Pack with shavings to absorb the water
Blow hole out with drill air
Drilling on steep slopes
Using wench
Get assistance
Not a one-person job
Communications between drill operator and wench operator
Need to coordinate activities
Establish anchor points
Examine cable and hook for defects
Crosby clamps
Never saddle a dead horse
Use separate anchor points for machine and driller
Anchor for machine must be a much heavier rod than one used for personal fall protection
Use a shieve wheel at the anchor point
Always have a double hook-up to the drill
Cable comes from drill through shieve back to drill
Use mast and boom to balance machine
Electrical storms
Lower mast and shut down machine
Report to supervisor
Caved-in holes
Drill adjacent hole (1-2' distance)
Fill unused hole with dirt
Stuck steels
Attempt to remove
Check with supervisor
Drill adjacent hole (1-2')
Fill unused hole with dirt
Compressor fire
Use extinquisher
Do not open doors if hot to touch
Stored on compressor
Stored in truck
Notify supervisor/co-workers in area
Medical emergencies
Provide first aid
Request assistance
Provide two-way radio
Motor oil
Use 55-gallon drum to clean up and properly dispose of
Used as a by-product (asphalt plant)
6. End-of-shift
Sprockets on mast
Grease entire machine weekly
Examine machine while greasing
Park drill
May be left at last hole
Depending on distance from wall/face
20' rule
Shut compressor down
Relieve pressure on machine by closing solenoid
Pressure should drop to 40 psi
Turn compressor motor off
Inventory of supplies for next shift
End-of-shift report
7. Transporting drill
Lower and secure mast
Stack hose on compressor
Place hose from rear of compressor in a zig-zag, side-by-side pattern
Each loop of hose will hang off each side of compressor
Secure with bungee cords
Connect compressor to the drill
Pentil hitch
May need to use swivel adjustment to connect
Clean work area
Pick up tools
If necesary to transport by truck
Clean down machine
Move drill
Check/clear/level area prior to moving
Plan your move
Start compressor up
Use controls while walking along side of drill
Use mast as counter-weight
Use boom to assist with drill balance
Keep tracks at same speed
Operator needs to stay clear of tracks
Avoid wearing loose clothing
Avoid pinch-points
Between drill and compressor
8. Drilling
Level/plumb mast
Extend boom 2-3' to hole marking
Lift front of tracks to apply downward pressure to mast
15' or less to wall
Wear fall protection
Drill first row of holes 20' from wall
Use these drill holes for tie off
Lower drill bit and rod to ground
Ensure first rod is always clamped down
Engage and lock centralizer
Turn on rotation
Start hammer
Slightly open water valve
Start lowering hammer
Once you being drilling, turn on the air
Apply necessary pressure for hammer to go down
Overpressure - will lift the mast (rotation very slow, may lockup)
Underpressure - will cause rods and hammer to separate
Striking bar should go 2-3" inside hammer at all times
Leave water on for first 10' when it is solid
Drill until coupling is about 2" from contacting the centralizer
Turn off water
Examine hole for possible voidance
Re-line hole with cuttings
Up to 30' depth only
Ensure 10' are good
Add rod
Leave clamps on
Turn off rotation
Turn on hammer and air to separate the striking bar from the coupling
Put in reverse
Raise hammer all the way up
Place grease on coupling end
Remove rod from rack
Place new rod on top of other one
Align rod with striking bar and hammer
Lower hammer slowly and turn on rotation (slowly)
Rotation should always be counter-clockwise
Once striking bar grabs coupling of new rod, release
Ensure the two rods are connected
Observe both top and bottom couplings at same time
If you have to physically touch the rods, make sure rotation is in neutral
Raise both rods up all the way to make sure hole is done right, clear of obstruction, etc
Open centralizer
Turn on rotation, hammer and air
Slowly lower the hammer
Once drilling begins, reset rod pressure
Drill until you can grab the other rod and slide it over and place it on existing rod
Repeat process until desired depth is reached
Remember to ensure hole is clear for each additional rod
Drill an additional 5' from the face height
Remove rods
Put rods all the way down
Give it some pressure
Turn on hammer and air to break rods
Listen for clicking sound
Indicates rods are loose
Begin picking up rods and lower centralizer
Once rods are up to couplings
Bottom of coupling must sit on top of centralizer
Put rotation on reverse and slowly raise hammer to begin unscrewing
Once unscrewed, lift the hammer all the way up the mast
Manually unscrew rods and place on rack
Repeat process until you reach last rod
On last rod, place lock on centralizer
Tension drill bit to centralizer
Measure hole depth
Retract the boom about a foot which will drag back the mast and prevent material from falling back into the hole
Raise the boom
Don't fight the machine
Cover/plug all holes
Use anfo bags
Cone-shaped plugs