Driving a car in a straight line depends not only on skillful handling, but also on a correctly adjusted camber-toe of the front wheels. You can make it both at the service station and in your garage. There are several ways to do this, but one of them, using laser pointers, is almost completely identical to the adjustment method on the bench.
Instructions
Step 1
Place the vehicle on a level and level garage floor. Prepare some tools. First, a screen with an emitter. Attach it to your garage wall or floor on a stand. In the first case, consider adjusting the position of the laser pointer. Attach it to the flexible holder. Make the screen from plywood, height 350 mm, width 400 mm. Make a markup on it: draw a vertical line strictly in the center, a horizontal one - stepping back 120 mm from the bottom. Place a laser pointer at their intersection. Make a place for it from a piece of the corresponding hollow tube (for the pointer), fix it on a metal plate 100x100 mm, and then on the screen.
Step 2
Mount the screen on a telescopic tripod, i.e. insert the pipe that holds it in the larger diameter. Provide a screw on it that will be used as a holder. The distance from the right and left screens to the reflectors can be different, take this fact into account in further calculations. The larger it is, the larger the measured values on the screen, and therefore more accurate. Use 4.5 V flashlight batteries to power the pointer.
Step 3
Install the second fixture on the wheel - a mirror, which will serve as a reflector of the pointer beam on the screen. Make mounting bolts from standard wheel bolts by increasing them with studs. The third device is centering screens. The camber adjustment platform must distribute the load evenly to all wheels. For easier turning of the front wheels, use two metal plates with a layer of grease between them. Place them under the wheels.
Step 4
Install screens at any distance from the reference pads. The surface of each screen must be parallel to the longitudinal-vertical plane of the machine, i.e. observe the horizontal. Otherwise, errors will appear in the angle measurements. If the screen is on the wall, then apply on it the fields of permissible deviations of the beam, this will make it possible to easily navigate in the future without making repeated measurements.
Step 5
Place the centering shields in place of the support pads. Turn on the emitters, adjust the beams so that each of them accurately passes through the holes in them and falls on the opposite screen. Then remove them.
Step 6
Install the car with the front wheels on the support platforms and fix the reflectors, changing the standard bolts one by one to the special ones. Measure the distance from the center of the screen to the surfaces of the reflector mirrors. Raise one of the front wheels and turn on the transmitter.
Step 7
Roll the wheel: the reflected beam on the screen describes a circle. Place the beam at the top of the circle. Adjust the reflector so that the beam hits only one point. Thus, the surface of the mirror will become parallel to the plane of rotation of the wheels.
Step 8
Lower the wheel with the correctly adjusted reflector and do the same with the other. Squeeze the suspension. To do this, press several times on the front of the machine, roll it back and forth a little and place it back on the support pads.
Step 9
Measure the camber angle by turning the steering wheel so that the beam hits the vertical centerline or near. The camber angle is equal to the deflection of the beam from this line. It is considered negative when the ray is reflected above the horizontal centerline, and positive if below. Calculate the angle by the formula sin = a / 2L, where a is the deflection of the beam, L is the distance from the screen to the reflector, 2 is the coefficient. For the classic VAZ, its boundaries at L = 1 m are equal to 0 ° 5 ± 20 ', this corresponds to the deviation on the screen - a = 2-0, 00145-1000 = 2, 9 (± 11, 6) mm. Carry out the adjustment by placing washers under the bolt on the front beam.
Step 10
Set the wheel toe-in control so that on one of the screens the beam hits the vertical center line. At the same time, measure the deviation from it on the second screen. Calculate by the formula: b = 2CXLD, where L is the distance from the reflector to the screen, Cx is the convergence, D is the diameter of the wheel disk (VAZ - 360 mm), 2 is the coefficient. Adjust the convergence by changing the length of the steering rods, try to maintain their approximate equality.
