![]() Dimensions above 120 but up 400 have a tolerance of +/. For a medium tolerance class per the ISO, dimensions over 6mm but up to 30 mm have a tolerance of +/. ![]() ISO2768 has a sliding tolerance based on the size of the dimension. I think Dazza was the closest to explaining the intracacy here but I need to correct him/her. It's been a few weeks since the last post on this discussion but let me correct something (and give my opinion at the same time). ![]() therefore the distance between the holes maybe 18mm (first at 121, 2nd at 120+19) This effectivly reduces the 1mm tol to 0.5mm.ĭazza RE: Tolerances of ISO 2768 cumulative or not? powerhound (Mechanical) 30 Jun 11 23:04 Just because the first hole is 1mm over dim, the second has a tolerance applied to the theorically correct position. If those same holes are dimensioned as 200 and 20mm, the manufacturer can assume that the 2 holes hole an individual fixture or 2 fixtures having a functional relationship between them. Applying a general tolerance of +/-1mm the 2 holes may be 18mm to 22mm apart. ie the 2 holes locate different fixtures correctly relative to the edge. If 2 holes are dimensioned as 200 and 220 from an edge, The manufacturer can only assume that the 2 holes have a relationship to the edge which is paramount to the correct proformance of the part. ![]() Im going to step in here because Im having this discussion at work currently.
0 Comments
Leave a Reply. |