Greenimi
Read what GDT Guru said.
"If there is a perpendicularity tolerance specified and its value is greater than the size tolerance, for example 2.0, the angle between the left wall and the datum plane A is controlled within 2.0. In that case, flatness error of the left wall of the 9.8-10.2...
Greenimi
What i meant was this.
Read the following statement from the standard.
"an orientation tolerance, when applied to a plane surface, controls flatness to the extent of the orientation tolerance" .
As discussed before, if the perpendicularity tolerance is greater than size tolerance...
Thanx pmarc and belanger and all who responded.
Just one last question.
In case perp tolerance is greater than size tolerance, lets say 2 mm, then flaatness of that considered surface is controlled within 0.4, not 2
Does this means that the statement in the standard " Orientation control...
I understood the concept.
Part can be any parallelogram while also being banana. In worst case, 0.4 form error will be there and angle could be of any value. Lesser or more than size tolerance.
Hello pmarc.
You mentioned in your 2nd post that orientation of left wall is not controlled by Rule 1 relative to any feature.
It means orientation is entirely uncontrolled??
Also, you editted your post and i saw two words " any parallelogram".
Please find attached hand drawn drawing...
Pmarc
Thanx for commenting sir.
Yes. I meant exactly what you said.
But still im confused.
There is no relationship between size limits and perp, i interpret this statement as that rectangular plate could be a parallelogram because size does not conrrol perpendicularity in this case...
Hello all.
Please find the hand drawn drawing of a rectangular plate.
The bottom surface is datum feature A. The perpendicularity call out for secondary datum feature is given. Value is not specified intentionaly.
The question is
" As per Rule 1, the length dimension of 9.8-10.2 can be...
Q1
Datum feature controlled with datumless positioning at RFS dia 0.5 as per your inquiry. My answer is that there will no virtual condition boundary. I dont think we can modify this feature at MMB in FCF of dia 8 hole.
Thanx Belanger.
How the things will change if datum feature E is modified at MMB?
Will it be fixed in size or there will be same case as in Fig 4.31 illustration "c" ?
But the datum plane derived from datum feature simulator will not be at the location where it should be.
The datum feature simulator will start its journey from MMB 13.5 and will keep on moving though the tolerance zone while being parallel to datum plane X towards LMC 13.3 until it makes...
Hello all.
Find the attached figure 4-43 of ASME Y14.5M-2009.
Consider the profile of the surface applied to datum feature E. The question is
If the actual measured value of the profile of surface tolerance is found to be non conformed then should we proceed to measure the position...
Thanx axym and pmarc. Much of the confusion is over but some is still there. I am still reviewing my GDT concepts as i was involved in this subject long ago. I am sorry for my foolish questions.
I shall ask one more.
Why we use the phrase " DOF locked wrt Datum reference frame"? Why not "wrt...
Pmarc
Also what does the first 3 lines of para 4.3 of ASME 2009?
Here what it writes
"The relationship between the primary datum feature and its datum feature simulator constrains the degrees of freedom according to the material boundary condition applied to the datum feature in the feature...
Thanx pmarc for your valuable response.
From now on, is it safe to remember the concept that we should apply the concept of locking DOF to tolerance zones, not parts?
