Toro 2226 Operator's Manual page 41

Note:
The depths given in the following table are for 3 m (10 ft) of combined drill head and pipe. As
you steer up, the pitch of the steered section changes and can be monitored with the receiver. Use the
following table to identify how many lengths of pipe will be necessary to insert and steer to the beginning
point and help you choose an entry point.
Pitch
Depth Change per 10 feet
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
11%
12%
13%
14%
15%
16%
17%
18%
19%
20%
21%
22%
23%
24%
25%
All measurements are approximate and will vary depending on soil conditions.
Note:
Refer to the guidance system Operator's Manual for more information.
Given the information in the table, you can calculate the number of pipes required to reach your beginning
point at the appropriate depth. Toro recommends that you start the entry point a distance back from your
beginning-at-depth point by the same distance as the length of pipes you will need to reach that point. This will
ensure that you have enough extra space so you will not over-steer and damage the pipes.
2 cm (1 inch)
5 cm (2 inches)
10 cm (4 inches)
13 cm (5 inches)
15 cm (6 inches)
18 cm (7 inches)
20 cm (8 inches)
25 cm (10 inches)
28 cm (11 inches)
30 cm (12 inches)
33 cm (13 inches)
36 cm (14 inches)
39 cm (15 inches)
43 cm (17 inches)
46 cm (18 inches)
48 cm (19 inches)
51 cm (20 inches)
53 cm (21 inches)
56 cm (22 inches)
61 cm (24 inches)
64 cm (25 inches)
66 cm (26 inches)
69 cm (27 inches)
71 cm (28 inches)
74 cm (29 inches)
Pitch
Depth Change per 10 feet
26%
27%
28%
29%
30%
31%
32%
33%
34%
35%
36%
37%
38%
39%
40%
41%
42%
43%
44%
45%
46%
47%
48%
49%
50%
41
76 cm (30 inches)
79 cm (31 inches)
81 cm (32 inches)
84 cm (33 inches)
86 cm (34 inches)
91 cm (36 inches)
94 cm (37 inches)
97 cm (38 inches)
99 cm (39 inches)
102 cm (40 inches)
104 cm (41 inches)
107 cm (42 inches)
109 cm (43 inches)
112 cm (44 inches)
114 cm (45 inches)
117 cm (46 inches)
117 cm (46 inches)
119 cm (47 inches)
122 cm (48 inches)
124 cm (49 inches)
127 cm (50 inches)
130 cm (51 inches)
133 cm (52 inches)
135 cm (53 inches)
137 cm (54 inches)