Flatness tolerance
Flatness tolerance
(OP)
Attached figure has been taken from the Alex Krulikowski book of GDT Fundamentals.
My answers are 0.4 for both blanks.Am i right?
My answers are 0.4 for both blanks.Am i right?
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RE: Flatness tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Flatness tolerance
What about this one.
My answers are
0.1 for A and 0.5 for B
RE: Flatness tolerance
0.4 for B
RE: Flatness tolerance
when Rule 1 applies then indirect flatness control exist for both surfaces.It will be 0.4 for both surfaces when part is at LMC.If surface A is limited to 0.1 then surface B will be 0.3 + 0.4 =0.7.
I mistakenly wrote 0.5 for B.
RE: Flatness tolerance
I will stick with 0.1 for A and 0.4 for B.
Let's wait for more people to review the question.
RE: Flatness tolerance
Both numbers won't happen at the same time, however. The key is that the question asks about the maximum permissible error. In order for surface B to get the 0.4 amount, surface A would have to be perfectly flat.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Flatness tolerance
I got your point. For B to have 0.4 which is maximum allowable A will have to be perfectly flat.
what will be the allowable flatness error for surface B? Not maximum this time.
RE: Flatness tolerance
RE: Flatness tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Flatness tolerance
RE: Flatness tolerance
Me too:
RE: Flatness tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Flatness tolerance
"The answers are 0.1 and 0.4.
Both numbers won't happen at the same time, however. The key is that the question asks about the maximum permissible error. In order for surface B to get the 0.4 amount, surface A would have to be perfectly flat."
This clears all.
RE: Flatness tolerance
0.4 and 0.4 in the first question, and 0.4 and 0.1 in the second question CAN happen at the same time.
Figure 4-3 from Alex's "Fundamentals of GD&T" (2nd edition) clearly shows that 0.4 and 0.4 at the same time is possible.
And CH's figure clearly proves that 0.4 and 0.1 CAN happen at the same too. This should not be a surprise - if 0.4 and 0.4 makes sense, then 0.4 and 0.1 must also make sense.
RE: Flatness tolerance
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Flatness tolerance
I know you already acknowledged that.
Waqasmalik quoted your reply and said it cleared all, so I just wanted to be sure that he noticed the mixup too.
RE: Flatness tolerance
Thanx pmarc, special thanx to JP,checkhater
RE: Flatness tolerance
If i apply a flatness tolerance of 0.3 for surface A then flatness tolerance for surface B will remain 0.4?
RE: Flatness tolerance
RE: Flatness tolerance