8. Rotation pressure gauge: This gauge indicates
the rotation pressure during drilling.
9. Blow pressure gauge: This gauge indicates
discharged air pressure.
10. Blower control lever: This lever controls the
amount of air going through the drill steel to clear the
cuttings from a borehole. When the lever is turned
towards the operator, the blow volume increases
gradually. When the lever is turned away from the
operator, the valve is opened fully.
NOTE: When drilling, open the blower control
lever fully.
11. Boom extension control lever: This lever
extends and retracts the boom.
12. Boom lift control lever: This lever raises and
lowers the boom.
13. Boom swing control lever: This lever swings
the boom left or right.
14. Guide dump control lever: This lever controls
the 180-degree forward and backward movement of the
drill guide.
15. Guide swing control lever: This lever controls
the swing of the drill. The maximum swing of the drill
guide is 45 degrees to the left and 45 degrees to the right.
16. Guide extension control lever: This lever
extends the drill guide for an additional extension of up
to 5 feet.
17. Anti-jamming system on-off control valve:
During operation, the anti-jamming system assists in
keeping the drill steel from jamming in a borehole.
18. Vaposol system on-off valve: During operation,
from a 40-gallon storage tank, the vaposol system
throws a mist of water down the drilled hole to control
dust. It can also be used while drilling to prevent a
cave-in from loose material in a borehole.
19. Needle valve: The needle valve controls the
amount of water to be injected into the blow air.
20. Panel lamp switch.
Positioning for Drilling
Positioning the rock drill is performed as follows:
1. Position the rock drill by using the traction
levers.
2. Place the crawler chassis in a horizontal
position, when possible, by using the track oscillation
levers, and then set the oscillation lock handles to the
drilling position to keep the rock drill stable while
drilling.
NOTE: The drill operator should approach marked
boreholes straight on as much as possible.
3. Position the drill guide over the spot to be drilled.
4. Extend the guide down until the second or third
track roller is just off the ground. Position the drill guide
inward towards the rock drill to compensate for the
pressure and angle of the boom when in position for
drilling.
5. Before drilling, you must ensure the guide is
vertically level by using a builders level on the front and
side.
Drilling Operation
Before drilling, make sure the
gauge indicates 100 psi. Drilling
follows:
blow air pressure
procedures are as
1. Open the blow control lever to admit air through
the drill steel and bit.
NOTE: Two types of drill bits, used in thr NCF, are
the roller bead and carbide insert.
2. Start forward rotation by pushing the control
lever toward the console.
3. Push the drill lever toward the console to start
the drifter conclusion.
4. Push the slow feed lever to collar the hole.
Collaring should be carried out by alternately moving
the feed lever up and down until the bit has penetrated
3 to 4 inches into solid rock.
NOTE: Make sure the hole does NOT deflect from
the desired hole direction.
5. After a successful collar is made, push the
rotation lever and the blow lever all the way, then push
the feed lever.
NOTE: Speed of drilling and rotation is automatic
according to the density of the rock formation. The
harder the rock, the faster the unit will drill. Use the
control lever for the desired speed.
CAUTION
Pay attention to the vibration of the
hydraulic hose in the drill. If the hose vibrates
abnormally, the accumulator of the drill is
14-20
