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1 Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

1 2000

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Vectorial dimensioning and tolerancing of ball screws

Humienny Z., Kiszka K., Sobolewski J.Z.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

2000

Vol. 76, nr 35

51-58

The implementation of vectorial dimensioning and tolerancing (VDT) for dimensioning and tolerancing of ball screw with focus on balls screw nut and recirculation inserts is discussed. The VDT concept is based on substitution of real workpiece surfaces by imaginary geometrical ideal features. Location vector, orientation unit vector, tolerances of their components and tolerated substitute size define the substitute element. The VDT approach changes significantly rules of geometrical tolerancing based on ISO 1101 and provides firm foundations for workpiece dimensional and geometrical accuracy. The classical dimensioning and tolerancing of the nut and ball recirculation elements is briefly given. Next generation of drawing with table according to the VDT rules and proposed principles of transformation are discussed. The VDT eliminates unclear cases of dimensioning and tolerancing and univocally defines geometry of the mating nut and ball recirculation element. It should be stressed that elimination of some unclear cases of classical dimensioning tightens manufacturing requirements. Correct VDT substantially facilitates verification of geometrical nut requirements with the coordinate measuring technique.