DATUMN REFERNCE CONTROL
DATUMN REFERNCE CONTROL
(OP)
Hello every 1,Hoping u would be f9 and having best of ur days.I have a question and its really confusing me.
when we apply a perpendicularity tolerance or parallelism tolerance wrt any datum refrence then should we specify the flatness of that datum reference?If yes,then is it mandatory that the perpendicularity or parallelism tolerance be more than that tolerance value?
when we apply a perpendicularity tolerance or parallelism tolerance wrt any datum refrence then should we specify the flatness of that datum reference?If yes,then is it mandatory that the perpendicularity or parallelism tolerance be more than that tolerance value?





RE: DATUMN REFERNCE CONTROL
Can you show the part of the drawing that you have issues with?
Chris
SolidWorks 11
ctopher's home
SolidWorks Legion
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
No .05 of perpendicularity will not be OK. It has to be greater than the flatness tolerance.
On the hand, if there was no flatness callout applied to the vertical portion of L, but perpendicularity, let's say 0.1, the perpendicularity would indirectly limit flatness to 0.1.
RE: DATUMN REFERNCE CONTROL
And, the perpendicularity tolerance of that vertical surface will control the flatness of that surface, by the way.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: DATUMN REFERNCE CONTROL
In that case, I do not see any connection between perpendicularity tolerance value on vertical surface and flatness tolerance value on horizontal surface.
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
It all depends on the functional requirements.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: DATUMN REFERNCE CONTROL
Chris
SolidWorks 11
ctopher's home
SolidWorks Legion
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
I am with pmarc on this, unless there is some exemption like tangent plane specified or something else I missed too.
Frank
RE: DATUMN REFERNCE CONTROL
[when we apply a perpendicularity tolerance or parallelism tolerance wrt any datum refrence then should we specify the flatness of that datum reference?If yes,then is it mandatory that the perpendicularity or parallelism tolerance be more than that tolerance value?]
Whenever a planar surface is used as a primary datum feature, a flatness control is applied to the datum feature. This general rule doesn't state in the standard, I think the reason is this will improve the stability between the datum feature and the datum feature simulator, it will have a better repeatability as well.
Saeaon
RE: DATUMN REFERNCE CONTROL
RE: DATUMN REFERNCE CONTROL
Season
RE: DATUMN REFERNCE CONTROL
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