A: if you want to measure the four-wheel positioning accurate must have the following requirements:

The accuracy of four-wheel positioning machine must be up to + / - 0.06 degrees, is not to do annual calibration.

(2) learning machine must keep around and around.

(3) corner plate shall be free of the rotation, around before and after the sliding and sliding.

(4) after the skateboard must be free sliding around and have a plus or minus 5 degrees of rotation.

(5) must do rims compensation.

6. Measuring the toe-in and camber Angle must keep the nose level correctly.

7 after measuring the Angle, the turn Angle (such as 20 degrees) must implement the determine, on the hand brake must pull to prevent body sliding backwards.

9, when measuring, often some parameters according to the machine instructions to move, can not transfer the has not been transferred to meet the requirements, then how to do?

A: first of all, adjust the Angle of four-wheel positioning is the cure table chassis maintenance method. If you want to cure, must replace the chassis parts. In this situation, consider to change a, two other adjustable pieces, to increase the adjustable range, three consider adjusting Angle to reduce wheel Angle difference, on the other side to avoid the partial line of driving.