Laser Guidance System

Assembly

A motorized total station on the tunnel wall behind the machine measures a target unit on the machine, and the guidance computer compares the result with the tunnel's design line and shows the operator the deviation and the steering correction. Surveyors move the station forward as the tunnel advances.

Direct parts	4
Class	Assembly

A motorized total station on the tunnel wall behind the machine measures a target unit on the machine, and the guidance computer compares the result with the tunnel's design line and shows the operator the deviation and the steering correction. Surveyors move the station forward as the tunnel advances. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.

Bill of materials for Laser Guidance System

4 top-level lines as of r194020

#	Item / sub-assembly	Part no.	Qty/assy	Ext. qty	Parts	Type
1	Total Station 8 parts	total-station	1×	1	0	product
2	Guidance Target Unit	main-beam-tbm-guidance-target	1×	1	·	part
3	Guidance Computer	main-beam-tbm-guidance-computer	1×	1	·	part
4	Reference Prism	main-beam-tbm-reference-prism	2×	2	·	part