Ditch Witch JT20 - Manual (Page 70)

JT20 Operator’s Manual
Prepare - 69
Plan Bore Path
CMW
®
Entry Pitch
Entry pitch is the slope of the drill frame compared with the slope of the ground. Determine entry pitch one
of two ways:
1. With Pitch Beacon
• Lay pitch beacon on the ground and read
pitch.
• Lay pitch beacon on drill frame and read pitch.
• Subtract ground pitch from drilling unit pitch.
2. With Measurements
• Measure from the ground to front end of drill
frame (H1).
• Measure from the ground to back end of frame
(H2).
• Subtract (H1) from (H2). Record this number.
• Measure the distance between front and back
points (C).
• Divide (H2-H1) by (C), then multiply by 100.
This is your pitch.
Minimum Setback
Setback is the distance from the entry point to where
pipe becomes horizontal (B1).
IMPORTANT: A shallow entry pitch (A1) allows you
to reach horizontal sooner and with less bending.
Increasing entry pitch (A2) makes bore path longer
and deeper.
NOTICE: If setback is too small (B2), you will
exceed bend limits and damage the pipe.