Ditch Witch JT920 - Determining Entry Pitch, Setback, and Depth

JT920/JT920L - PREPARATION 61
PLAN BORE PATH
JT920/JT920L - PREPARATION 61
PLAN BORE PATH
Entry Pitch
Entry pitch is drilling unit slope compared to slope of ground.
Entry pitch can be determined two ways:
1. Lay pitch beacon on ground and read pitch. Lay pitch beacon
on drilling unit and read pitch. Subtract ground pitch from drill-
ing unit pitch.
2. Measure from ground to front
end of frame (A). Measure from
ground to back end of frame (B).
Subtract front measurement from
back measurement to get rise.
Measure distance between front
and back points to get run (C).
Divide rise by run and multiply by
100 to get pitch.
3. A shallow entry pitch allows you to reach horizontal sooner
and with less bending. Increasing entry pitch makes bore
path longer and deeper.
BA–
x 100
C
Entry Pitch
Entry pitch is drilling unit slope compared to slope of ground.
Entry pitch can be determined two ways:
1. Lay pitch beacon on ground and read pitch. Lay pitch beacon
on drilling unit and read pitch. Subtract ground pitch from drill-
ing unit pitch.
2. Measure from ground to front
end of frame (A). Measure from
ground to back end of frame (B).
Subtract front measurement from
back measurement to get rise.
Measure distance between front
and back points to get run (C).
Divide rise by run and multiply by
100 to get pitch.
3. A shallow entry pitch allows you to reach horizontal sooner
and with less bending. Increasing entry pitch makes bore
path longer and deeper.
BA–
x 100
C