Table des Matières
Publicité
Les langues disponibles
Les langues disponibles
4.
Connect the water hose to the Dymodrill water shut-off valve and to
the water supply. Make sure the seal is watertight. Use a standard
garden hose if you require additional length. Set up a water collection
system.
5.
If you are using a vacuum system, read the instructions for specifi c
setup in "Assembling & Using a Vacuum System".
Do not continue the following steps until the vacuum gauge reads at
least 20 inches of mercury vacuum. Never operate the Dymodrill if the
gauge reads less than 20 inches (see "Mothods for Securing Equipment
to Work Surface"). Always monitor the vacuum gauge during coring. If
water collects in the vacuum pump fi lter jar, empty it to prevent damage
to the pump.
To reduce the risk of injury, do not operate the Dym-
orig if the gauge reads less than 20 inches of mercury
vacuum.
6.
Turn the Dymodrill motor ON. Turn the water on so it fl ows freely through
the water shut-off valve (see "Supply an Adequate Water Flow"). Turn
the valve clockwise to increase water fl ow and counterclockwise to
decrease water fl ow.
7.
While holding the handle, slightly loosen the cradle lock handle and
slowly rotate the handle to lower the bit into the workpiece, applying
steady, even pressure. To help reduce bit wandering, always use a light
load to start the hole and wait for the tip of the bit to penetrate the work
surface completely before increasing the load.
8.
Use suffi cient pressure so the bit cuts constantly. Use the ammeter on
the meter box as a guide for proper pressure.
NOTE: If the rig shifts during coring, stop the motor, reposition the rig
and resume coring.
9.
Monitor the water fl ow (see "Diamond Coring"). Generally, water should
fl ow at a rate of approximately one to two gallons per minute. If the water
fl ow is too heavy, the two holes in the water swivel housing will leak.
If that happens, reduce water fl ow. Water fl ow is adequate when the
water and cuttings are fl ushed in a circular pattern about 1/2" around
the bit. Keep the work area dry.
10. When the cut is complete, keep the drill motor ON and rotate the handle
clockwise to remove the bit. The bit may become stuck in the hole if
you turn the motor OFF before the bit is completely removed. Once the
bit is removed from the work surface, turn the motor OFF. Tighten the
cradle lock handle. Unplug the meter box from the power supply before
removing the vacuum pump to prevent accidental starting of the motor
when the vacuum pump is released.
If you are using a vacuum pump, unplug it and open the vacuum release
valve to release the vacuum.
page 10
WARNING!
Retrieving Cores and Deep Coring
When coring holes that are longer than the core bit, follow the steps be-
low.
1.
Begin coring the hole as usual. When you have cored to the length of
the bit, stop the Dymodrill motor.
2.
Remove the core by driving a chisel or slender wedge into the cut be-
tween the core and the work surface. You may also use a special core
tongs, bent wire or anchor bolts to remove the core.
3.
After removing the core, reinsert the bit or use a bit extension and
continue coring (see "Accessories"). Removing cores with diameters
greater than twice their length can be diffi cult. One method to remove
such cores is to fi rst break the core into smaller pieces and then re-
move the pieces. Electric hammers and chisels are ideal for breaking
cores.
When coring through fl oors, cores generally drop
from the bit. To reduce the risk of injury, provide
proper protection for people and property below the
coring area.
Diamond Coring
Factors that infl uence diamond core performance:
•
Amount of coolant
•
Dymorig rigidity
•
Dymorig condition
•
RPM of drill motor
•
Feed pressure applied to bit by operator
•
Amount of steel
•
Size of embedded steel
•
Age of concrete
•
Aggregate (size, type, hardness, abrasiveness)
•
Type of sand–manufactured vs. river (natural)
•
Operator technique
•
Operator care
•
Bit runout
Operator Technique
Core with consistent, fi rm feed pressure. Do not subject the bits to sudden
impacts. Uneven feed rate cracks diamonds. Low feed pressure polishes
diamonds, slows penetration and contributes to bit glazing. High feed
pressure can overload the drill motor or can cause diamonds to pull out
prematurely, particularly when coring embedded steel. Make the bit work,
but do not try to jam the bit through the material.
If vibration occurs:
1.
Stop drilling.
2.
Turn motor off.
3.
Check for loose bolts, nuts and gib screws. Tighten if required.
4.
Check for bit runout. Replace if required.
If vibration continues to occur, remove the core and loose material.
If vibration continues to occur after attempting these measures, return the
rig to the nearest MILWAUKEE service facility.
WARNING!
Publicité
Table des Matières
