Charoit is the origin of modern transportation, the track size and the direction function of front wheels, affect the design of modern transportation method. like railway system, vehicle system etc. There shall be wheel alignment specification for each charoit too, base on the design. It was possible that they use tape meter to do wheel alignment. and this method is still applicable for doing wheel alignment for modern cars, search youtube and you will find some video about this method. but frankly speaking, this way is pretty difficult for the car you drive, and it require your deep knowledge of wheel alignment, because the structure of suspension of vehicle is too much more complicated than it used to be. To realize wheel alignment with tape meter, cost you no money, but will cost you a lot of time, and accuracy is not assured.
the result done by this way, is very nice, except that it can not do wheel compensation, to elimate the errors.
CMOS camera was widely used in 1990s, on wheel alignment system as well, then we have CCD wheel aligner, in that CCD is more accurate and less affect by the sunlight.
CMOS and CCD wheel aligner carry the same methemetical model:
Now 3D wheel aligner attract more and more attention, in that it offer more durability and stability for the wheel aligner itself. and reduce the spread cost of wheel alignment in the long run. another good news is, 3D wheel aligner doesn't require a set of good clamp.
The vehicle shall have same data inside the camera range. but most 3D wheel aligner manufacturer havn't solve this yet. instead, they fix one or few height point. when they ask you to calibrate the wheel aligner at a fixed height, or ask you to calibrate it at more than 1 height level. they just not solve this yet.
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