Perpendicularity of a frame
Perpendicularity of a frame
(OP)
I am building a frame per the attached. The questions:
Perpendicularity of each side is shown as .06 relative to datum A.
Question 1:
a) Does this mean that the point shown at each red arrow tip (left side and right side) can each "swing" .060 to the left or .060 to the right? (making for a total allowed arc of 0.120)
b) OR does this mean that the total maximum allowed "swing arc" is .060, meaning that the maximum allowed in either direction off of nominal is .030?
Question 2:
Is there any linkage between the left and right? Or is each perpendicularity symbol taken on its own, without regard to the other?
(This would mean that if left and right sides angled out, that the distance between the red arrow tips would be 0.120 (if the answer to 1a above is 'yes'), or 0.060 if the answer to 1b is 'yes')
Also, is there a citation or section in Y14.5 that describes this?
Thank you
Perpendicularity of each side is shown as .06 relative to datum A.
Question 1:
a) Does this mean that the point shown at each red arrow tip (left side and right side) can each "swing" .060 to the left or .060 to the right? (making for a total allowed arc of 0.120)
b) OR does this mean that the total maximum allowed "swing arc" is .060, meaning that the maximum allowed in either direction off of nominal is .030?
Question 2:
Is there any linkage between the left and right? Or is each perpendicularity symbol taken on its own, without regard to the other?
(This would mean that if left and right sides angled out, that the distance between the red arrow tips would be 0.120 (if the answer to 1a above is 'yes'), or 0.060 if the answer to 1b is 'yes')
Also, is there a citation or section in Y14.5 that describes this?
Thank you





RE: Perpendicularity of a frame
thanks
RE: Perpendicularity of a frame
Without seeing your diagram I would say this:-
If you put a geometrical tolerance of squareness (0.06) of a single feature to a datum then the allowable out of squareness would be +/- 0.06.
So if you have 2 features going to the same datum the maximum parallel error between them would be 0.12.
Hope that helps
regards
desertfox
RE: Perpendicularity of a frame
RE: Perpendicularity of a frame
RE: Perpendicularity of a frame
1. A is correct - the total swing is .12 (.06 in any direction).
2. Perpendicularity is only taken between the surface which is being controlled, and the controlling datum(s) (i.e. left and right have no bearing on each other unless referenced parallel to one another with one being a datum). The arrow points can shift .06 in any direction, and therefore can be +/- .12 away from each other, off-normal.
Hope this helps.
V
Mechanical Engineer
"When I am working on a problem, I do not think of beauty, but when I've finished, if the solution is not beautiful, I know it is wrong."
- R. Buckminster Fuller
RE: Perpendicularity of a frame
Failure is a prerequisite of successful design
RE: Perpendicularity of a frame
RE: Perpendicularity of a frame