Ditch Witch OnGrade - Manual (Page 36)

OnGrade Operator’s Manual
Conduct OnGrade Bore - 35
Take Readings
CMW
Regular
1. Use tracker arrows to get grade pole close to the beacon.
2. Check virtual bubble level to ensure grade pole is straight up and down.
3. Gradually move the base until the arrows become black diamonds.
4. Adjust grade pole until middle (green) light comes on.
5. Look at bubble level on tracker to verify grade pole is still straight up and down.
6. Press depth button on grade pole to take depth reading. If depth does not register, press again.
Offset
When an obstruction prevents the operator from
getting directly over the beacon, use the offset
location mode of the tracker with the grade pole to
locate beacon from the side of the bore path.
Return to regular locating once obstruction is no
longer an issue. The 360° laser plane allows for
offset location by the grade pole as well. See
“Laser Plane” on page 38.
Pitch Only
In situations where a large iron or steel object on the ground surface is near the tracker, the depth reading
from the tracker will probably be incorrect. In most instances, the depth will be shallower than the actual
depth of the drill head. This will cause the total distance from the laser plane to the drill head to be off by
that amount. In most situations, this error will be apparent when the operator sees a large discrepancy
between the total depth reading near the obstruction and the previous readings. In this situation, the drilling
unit operator must disregard the depth and use only the pitch information from the tracker until the drill
head passes the obstruction and a good depth reading is taken.
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