Vermeer Navigator D20x22 II Series User Manual

30-50 Overview D20x22 Series II Navigator HDD
Rod Wrap and R.A.T.T. Oscillation
As drilling distance increases, drill string windup increases with the longer drill
string. The result is rod wrap and the drill head rotates fewer degrees than the drive
chuck.
To maintain the drill head rotation angle when steering with a long drill string, the
drive chuck rotation angle must be increased to compensate for rod wrap. Failure to
increase drive chuck rotation angle as the bore length increases may result in
decreased productivity and eventual stoppage.
Rod wrap will vary based on drilling conditions and drill pipe diameters. Adjust
rotation angle with Increase/Decrease Keys (1) as needed to compensate for rod
wrap.
1

Vermeer Navigator D20x22 II Series Specifications

General

Brand	Vermeer
Model	Navigator D20x22 II Series
Category	Construction Equipment
Language	English