DeWalt DW090 Guide D'utilisation

D WALT Industrial Tool Co., 701 East Joppa Road, Baltimore, MD 21286
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(DEC03-CD-1) Form No. 621277-00
The following are trademarks for one or more D
color scheme; the "D" shaped air intake grill; the array of pyramids on the handgrip; the kit
box configuration; and the array of lozenge-shaped humps on the surface of the tool.
IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT THIS OR ANY D
CALL US TOLL FREE AT: 1-800-4-D
Safety Instructions for Levels and Transits
WARNING! Read and understand all instructions. Failure to follow all
instructions listed below may result in electric shock, fire and/or serious
personal injury.
SAVE THESE INSTRUCTIONS
DANGER: Do not operate during storms or near high voltage. NEVER attempt to use
a grade rod in a storm or near overhanging electric wires.
DANGER: Do not use optical tools such as a telescope or transit to view a laser
beam. Serious eye injury could result.
DANGER: Always be sure to set up optical instruments so that any user will not
intentionally or accidentally look through the instrument at the sun or any other
source of bright light, keeping in mind that the sun moves throughout the day.
• Store level and transit out of reach of children and other untrained persons.
• Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one level and transit, may create a risk of injury
when used on another level and transit.
• Tool service must be performed only by qualified repair personnel. Service or
maintenance performed by unqualified personnel may result in injury. To locate your
nearest D WALT service center call 1-800-4-D
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http://www.dewalt.com on the Internet.
• Do not operate the level and transit around children or allow children to operate the
level and transit. Serious eye injury may result.
• Do not remove or deface warning labels.
• Position the level and transit securely on a level surface. Damage to the level and
transit or serious injury could result if the level and transit fall.
WARNING: This product contains chemicals, including lead, known to the State of
California to cause cancer, and birth defects or other reproductive harm. Wash hands after
handling.
• Avoid prolonged contact with dust from power sanding, sawing, grinding, drilling,
and other construction activities. Wear protective clothing and wash exposed
areas with soap and water. Allowing dust to get into your mouth, eyes, or lay on the skin
may promote absorption of harmful chemicals.
Components
BUILDER'S LEVEL DW090 (FIG. 1)
A. Rubber Eyepiece Cap
B. Focusing Knob
C. Telescope Level Vial
D. Horizontal Circle
E. Leveling Screws
F. Horizontal Tangent Drive
G. Base Plate
To ensure the accuracy of your instrument, check to make sure it is calibrated often. See the
Field Calibration Check section of this manual.
ASSEMBLY
D WALT Builder's and Transit Levels are fully assembled at the factory. No further assembly
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is necessary. See the following instructions regarding the tripod.
DW090, DW092 Copyright © 2003
WALT power tools: the yellow and black
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WALT (1-800-433-9258)
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WALT (1-800-433-9258) or go to
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TRANSIT LEVEL DW092 (FIG. 2, 3)
A. Rubber Eyepiece Cap
B. Focusing Knob
C. Telescope Level Vial
D. Horizontal Circle
E. Leveling Screws
F. Horizontal Tangent Drive
G. Base Plate
H. Vertical Arc
I. Vertical Index Pointer
J. Vertical Tangent Screw
K. Lock Lever
DW090
FIG. 1
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DW092
FIG. 3
Tripod Setup
1. Loosen the straps (L) around the tripod legs (M). Lift the extension quick-release clamps
(N).
2. With the tripod closed, extend the legs so the tripod head is approximately eye level.
Tighten the quick-release clamps.
3. Position the legs in a triangular position. Fix the legs firmly into the ground by pressing
on the tripod shoes (O).
4. Gently remove the level from the carrying case. Note how the level is packed so that it
can be placed back in the same position.
5. Carefully position the instrument in the approximate center of the tripod head (Q). Insert
the tripod centering screw (Q) into the base plate (G), taking care to align the threads
properly. Tighten the screw until the instrument fits snug on the tripod. Do not overtighten
or strip the threads.
Leveling
1. If using the DW092 Transit Level, make sure the lock lever (K) is engaged.
2. Turn the telescope so that it is aligned with two of the leveling screws.
3. Holding the two leveling screws on one side of the the telescope, turn both knobs in
opposite directions (moving both thumbs simultaneously toward or away from you), until
the bubble is centered in the vial. (This loosens one screw while tightening the other.)
NOTE: If the instrument rocks, it is not securely mounted to the tripod or the tripod is not
securely situated. You will NOT be able to level the instrument until it is secure.
4. Rotate the telescope 90˚ then only turn the third knob until the bubble is level again.
5. Rotate the telescope 90˚ again to make sure the bubble is still centered.
NOTE: If the instrument is properly leveled, the bubble should stay centered throughout
the 360˚ rotation. If the instrument cannot be properly leveled, it needs to be checked by
a qualified technician.
OPERATION
WALT TOOL,
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Stadia Measurement
The Builder's and Transit Levels are equipped with a stadia reticle so you can make simple
distance estimates. The stadia lines are located in the reticle (Figure 5). Sight the rod, read
the two observations at the stadia lines, take the difference of these observations and multi-
ply by 100 to estimate the distance between the rod and the center of the instrument.
Measuring Height Difference (Fig. 5, 6)
1. Set up the instrument at a point approximately halfway between points A and B (Fig. 6).
NOTE: The reticle stadia lines can be used to optically compare the distances.
2. Position the rod vertically at point A. Take reading (a) [back sight] on the rod at point A.
3. Then sight the rod at point B and take reading (b) [foresight].
4. The difference (a – b) is the height difference (h) of B from A (Fig. 6).
Therefore point B is 2.00 ft. higher than point A (the value of h will be negative if point B
is lower than point A).
WHEN THE DISTANCE BETWEEN POINTS A AND B IS LARGE OR IF THE HEIGHT
DISTANCE IS GREAT
1. Divide the distance into a number of sections and determine the height difference of each
section (Fig. 7).
2. The height difference between points A and B is the total of the height differences of all
the sections.
The general formula is:
altitude of known point + total of back sight values – total of foresight values =
altitude of the required point
NOTE: This simple leveling technique has no error check. It is better to measure from A to B
and then measure back to A so that the error of closure can be calculated.
Horizontal Circle and Reading (Fig. 1, 2)
Your instrument is equipped with an easy-to-read horizontal circle (D) for simple angle turning.
This horizontal circle is turntable and is used for laying out or estimating rough angles. The
horizontal circle is graduated in single degrees. The index line is located above the horizontal
circle.
Use the plumb bob provided and set up the instrument directly above the surveying point.
Sight the objective and use the horizontal tangent screw to bring crosshairs precisely on line
with tangent objective. Using the index line of horizontal circle, take the angle reading. The
vernier can be used for reading the circle in increments finer than single degrees. With the
DW092 Transit Level, the vertical index pointer (I) is used to read your vertical angles.
PLEASE READ BELOW BEFORE USING YOUR NEW INSTRUMENT
Although this instrument has gone through various checks and adjustments at the
factory, instruments may come out of calibration during shipping. Because of this, we
recommend that you have this instrument checked for calibration by a qualified
instrument technician or follow the procedure described below.
Field Calibration Check (Fig. 8, 9)
1. Place two rods facing each other at points A and B at a distance of 50 - 80m apart (Fig.
8). Set up your instrument about halfway between A and B. If you are using a transit level,
be sure that the lock lever is engaged.
2. Sight the rods and take readings on point A as A and on point B as B.
3. Set the instrument at point D which is about 2m from point A (Fig. 9).
4. Sight the rods at point A, take reading as AA. Then, sight the rod at point B, take reading
as BB.
5. Use the following equation to calculate:
The instrument is in its perfect condition if BB' = BB, otherwise, it needs adjustment.
FIG. 2
B
A
C
F
E
G
FIG. 4
N
M
H
I
Example: a – b = h
5.25 ft. – 3.25 ft. = 2.00 ft.
BB' = AA – (A – B)
A
B
J
C
K
F
D
G
E
P
L
Q
O