Downloaded from https://www.everyspec.com to concentricity. The small diameter of the re- in respect to the datum hole vary with the size, Ceiver in 1.004, permitting the centerline of the but they will also vary with respect to each small diameter of the part to be displaced 0.002 other. In any direction from the centerline of the large diameter, when maximum metal conditions pre- A variation of the dependent locational tol- vail in the part. When minimum metal condi- erance, involving basic angular and radial di- tions prevail, the effects of the diametral tol- mensioning, is shown in figure 5-23a.
In the ersace enter, and the centerline of the small part illustrated, the large hole is located by de - diameter may be displaced0.004 in any direction pendent locational tolerance in the manner pre- from the centerline of the large diameter. Fig- viously described. The small hole is located by ure 5-22 shows the variations possible under a combination of a basic angular dimension and minimum and maximum metal conditions. It a basic radial dimension. Any attempt to use a should be noted that the effect of ovality is toleranced angle and toleranced radius will re- checked in the gaging operation, suit in a tolerance zone similar to that shown in figure 5-23b.
Since the gage engineer will The methods of dimensioning and locating holes use round pins, the dark shaded areas repre- shown La figures 22, 23, and 24 of Drawing 30-1- sent the extent to which the contractor will be 7 will easily be understood when the foregoing denied the use of the lull tolerance when the principles of dependent locational tolerancing gage accepts only conforming parts, while the are grasped. It should be borne in mind, how- light shaded areas represent the extent to which ever, that not only will the positions of the holes nonconforming parts will be accepted, if the -1.5001.500 1.000 -- ,998 A. iAX.- MAX. METAL 9. MAX.- MIN.
METAL -1.495 I 1.496 S- .00 -006 1.000 .998 C. MON. -MAX METAL D. MIN.-MIN. METAL k-igure 5-22. Receiter and fixed dimensions - effect of dimensional and locational tolerances 5-20