Ditch-witch JT922 User Manual download pdf (Page 61)

Prepare - 60 Manual

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.

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Ditch-witch JT922 User Manual Page 61