Setting measuring points on wheel alignments and constructive geometries is the most important thing on earth, because no floating nor drifting of zero points is allowed in order to obtain accurate numerical datum.
Very expensive wheel alignment tester system like the machinery equipped in the factory technical center has been adopted the circular points on wheel rim, but wait please here, alminum wheel has a permission to allow 1mm deformation as a tolerance on outer circle points? Suppose 15" wheel, how much error were permissive prior to the measurements on wheel measuring points?
360*60*1/(2πr)=360*60*1/(2*3,14*15*25,4)=9,028(min.)
Judging from my experiences these 10 years, this value produces unacceptable strange steering reactions, easily leads to steering habits, right or left.
So, as for my experiments much more reliable measuring zero points were invited, they are hub outer circular surfaces, as conventional camber scalers uses this surface with magnetic contacts.
These surfaces were utilized on both measurement procedures, vertical and horizontal directions.
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