Multiple secondary target points Multiple secondary target points RLD89 (Aerospace) (OP) 21 Feb 17 13:21 When using datum targets on a flexible part with a complex shape, there is no limit to the number of primary target points. Can the secondary have more than two target points? RE: Multiple secondary target points 3DDave (Aerospace) 21 Feb 17 14:37 If it makes sense to use multiple directions of restraint then there is no need to limit the number of them. RE: Multiple secondary target points pmarc (Mechanical) 21 Feb 17 17:57 From Y14.5-2009, para. 4.20: "In a restrained application, it is permissible to use as many datum targets as necessary to establish the datum features." RE: Multiple secondary target points SeasonLee (Mechanical) 21 Feb 17 21:18 There are 4 target points on secondary datum feature on Fig.B-2 Y14.8-2009. Season http://files.engineering.com/getfile.aspx?folder=90555e9e-3e8d-4d3c-b63d-f0 RE: Multiple secondary target points Belanger (Automotive) 21 Feb 17 21:28 Even in an unrestrained condition, it would be permissible to use more than the usual number of targets. The part may not contact all of them (which is why restraining is often advisable) but maybe full contact isn't needed. Also, there are instances of a secondary datum needing less than two points of contact -- only one point. John-Paul Belanger Certified Sr. GD&T Professional Geometric Learning Systems RE: Multiple secondary target points RLD89 (Aerospace) (OP) 21 Feb 17 23:48 Thanks to all for the responses. It clarifies doubts I had.