I have a question / Question from Don day GD&THierarchy Workbook 1

[huni]

Hello Gents

I am preparing for GDTP cert now.
so,I have been studying ASME standard and Don day's Hierachy workbook.
I have a question.

This question came from Hierachy workbook.
The GD&T Hierarchy Y14.5-2009 workbook.
The question number is C.5.6
(I have a solution note also..but there is no explain how to solve it)

Q : C.5.6
answer: a) 0.15

I only understand that hole is produced at 20mm (so, perpendicularity is increased to 0.4 mm / but actual out of perpendicular is 0.1mm-->??
Did I understand correctly?)
and Question : The pattern of features( 4 X ∅10 +/-0.2)may be displaced radially from the datum axis by

a : 0.15

Is anybody knows about this question?
Would you explain how to solve it?

Please help me.

I attached the captured photo of question.

Thanks

 

[CheckerHater]

Just wanted to note, that the tilt will reduce the radial displacement in "transverse" direction as well, so "close but no 0.20"

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[greenimi]

Evan said:

". Keep in mind that the writers of GD&T textbooks and exercise books (and even standards) can only get into the intricacies to a certain extent, without losing most of their audience"

I am lost!!

 

[CheckerHater]

greenimi, you have to start taking things less seriously

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

[axym]

CH,

You're right, the tilt does bring the surface slightly closer in the transverse direction and reduces the displacement. No argument there.

greenimi,

I think I remember saying that in some other thread. The issue that Dave raised is one of those intricacies, that would lose 99% of GD&T people (committee members included). The MMB of datum feature B isn't really cylindrical - we only treat it as cylindrical because Y14.5 says it's cylindrical. The hole can be tilted in any direction, but it can only be tilted in one particular direction. Kind of an "or" versus "and" thing. So the datum feature shift has a directionality to it. But this is deeper than most people want to go.

Evan Janeshewski

Axymetrix Quality Engineering Inc.

http://www.axymetrix.ca

 

[greenimi]

Re: " greenimi, you have to start taking things less seriously smile"

Yes CH. I also have to hire a Certified Road Sign Professional

""""So far, in the world of GD&T, one has to hire Certified Road Sign Professional every time one takes car out for a spin."""""