perpendicularity question
perpendicularity question
(OP)
hello - I was told today that I did not understand the use of perpendicularity - I have a piece that has 2 90 degree surfaces - the top surface is 10" long which is perpendicular to the front surface which is 36" long = the front surface is datum a the top surface is perpendicular to a within .001" - I was told that in this configuration that surface a could be out by at least .036" (.001"x36) - this does not seem right to me - I thought that surface b must lie between 2 planes within .001" perpendicular to surface a - I would think that if a straightness tolerance of say .001"per inch on datum a then that might apply - I just need to clarify it for myself - any help would be greatly appreciated - thank you





RE: perpendicularity question
Certified Sr. GD&T Professional
RE: perpendicularity question
RE: perpendicularity question
Certified Sr. GD&T Professional
RE: perpendicularity question
RE: perpendicularity question
As per ASME Y14.5, perpendicularity is a linear measurement, as you have described. Perhaps your co-worker thinks it is an angle.
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JHG
RE: perpendicularity question
Your interpretation is correct. There is no ratio "multiplier" based on the length of the datum feature or the feature under control. See Figure 6-3 on page 100 in Y14,5-2009. Note too, when applied to a planar surface, there is implied flatness equal to the perpendicularity tolerance.
Certified Sr. GD&T Professional
RE: perpendicularity question
RE: perpendicularity question
Certified Sr. GD&T Professional
RE: perpendicularity question
Is there a chance that your co-worker thinks about something like this? And are you sure he meant .036", and not .0036"?
http://files.engineering.com/getfile.aspx?folder=9...