First Iteration; Second Iteration - Leica Captivate Technical Reference Manual

Drilling rig orientation
Roads - Tunnel

First iteration

e
a
e
b
a
Tunnel_016
The true chainage of the measured point of the first iteration (e') is then cal-
culated. The defined point (e) is staked out at the calculated chainage (d).

Second iteration

This process is repeated until the differences between staked point and the
defined point are within a defined tolerance.
a
c
b
a
Tunnel_017
Description
This functionality helps to orientate the drilling rig when drilling holes parallel
to the tunnel axis or using a drilling pattern, that is manual entry of drill direc-
tion.
e'
e'
a
c
b
d
c
d
e
e') Point to stake out on tunnel
e
e
d
a
b
c
d
e
Centreline
Instrument position
Tunnel face
Approximate chainage to
stake out
Point to stake out at approxi-
mate chainage
face
Centreline
Instrument position
Tunnel face
Calculated chainage from first
iteration
Point to stake out at calcula-
ted chainage
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