1. Setting Out, Theodolites and Total Stations
BE1S204
David Harper

2. Introduction to today’s lecture
Setting out – using a tape measure
Setting out – using a theodolite or total station

3. Setting out - using a tape measureC a b A c B
a² = b² + c²
b² = a² - c²
c² = a² - b²

4. Setting out – using tape measure (cont.)
X = √8² + 12² =
Tape
Tape
Where X and 8 cross on the two tape measures, this is where you place your peg and nail. C D
If point C is correct, then repeat process for D. If C and D are correct, check the distance between them both is exactly 12 metres. X 8 A 12 B

5. Setting out – using a theodolite or total station
27.333
SOHCAHTOA
Sine = Opposite ÷ Hypotenuse
Cosine = Adjacent ÷ Hypotenuse
Tangent = Opposite ÷ Adjacent
35.000
What is the value of angle ?
Tan Ѳ = Opposite ÷ Adjacent
Ѳ = Tan -1 x (Opposite ÷ Adjacent)
= Tan -1 x ( ÷ )
= 37 o 59’ 16” ?

6. Setting out – using a theodolite or total station (cont.)
12.508
What is the value of X:
X = √3.827² ² =
3.827 X
What is the value of angle ?
Tan Ѳ = Opposite ÷ Adjacent
Ѳ = Tan -1 x (Opposite ÷ Adjacent)
= Tan -1 x ( ÷ 3.827) =
= 72 o 59’ 16” ?

7. Setting out – using a theodolite or total station (cont.)
Peg & nail
72O59’16”
00O00’00”
12.508
Calculating the distance and angle using a modern Casio calculator?
Pol(Adjacent,Opposite)
Pol(3.827,12.508)
r =
Ѳ =
= 72 o 59’ 16”
3.827
13.080
90O00’00”
Theodolite

8. Setting out exercise using Total Station
Objective
To set out and check a simple building plot to a tolerance of ± 10 mm.
Tasks
Perform the necessary calculations required to complete the task i.e. calculate angle and distance. This will involve Trigonometry.
Set up the Total Station at M12, sight to station M15 and set the horizontal circle to 00o00’00.”
Set out points A and F along this line.
Move the Total Station to set up over point A, sight point F and set to 00o00’00.”
Turn the Total Station to the calculated angles and set out pegs and nails at the correct distances.
Carry out the relevant checks to confirm accuracy.

9. Setting out exercise using Total Station (cont.)

10. Setting out exercise using Total Station (cont.)

11. 5850

12. Setting out exercise using Total Station (cont.)
Opp
Adj C B D E
Opp
M12 F
00O00’00” A
M15
00O00’00” m
Adj

13. Setting out exercise with Total Station – table to be completed

14. Setting out exercise with Total Station – calculations completed

15. Summary of today’s lecture
Setting out – using a tape measure
Setting out – using a theodolite or total station