Thread depth in a pocket & slot GD&T callout
Thread depth in a pocket & slot GD&T callout
(OP)
Are thread depths the same as counter bores in there interpretation?
Is either slot callout correct?
Please view the attached pdf and let me know which are the correct callouts.
Is either slot callout correct?
Please view the attached pdf and let me know which are the correct callouts.





RE: Thread depth in a pocket & slot GD&T callout
I also like B in the dimensioning the depth of the thread since it came from a base line rather than chain dimensioning.
Dave D.
www.qmsi.ca
RE: Thread depth in a pocket & slot GD&T callout
5.10.1 (Fig. 5-47) illustrates an example of a slot.
RE: Thread depth in a pocket & slot GD&T callout
I never realized that a depth callout of "3" is to be interpreted as "13".
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. - Hunter S. Thompson
RE: Thread depth in a pocket & slot GD&T callout
You misinterpreted 1-37. It means that the largest counterbore of 10 mm has a depth of 3 mm.
Dave D.
www.qmsi.ca
RE: Thread depth in a pocket & slot GD&T callout
Now I understand. Thanks!
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. - Hunter S. Thompson
RE: Thread depth in a pocket & slot GD&T callout
Having said that, the actual numbers on your example make no sense. The two counterbore depths equal the thread depth, so there is no available material to make the threads.
Regards,
Cory
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RE: Thread depth in a pocket & slot GD&T callout
Dave D.
www.qmsi.ca
RE: Thread depth in a pocket & slot GD&T callout
B is most correct interpretation on the thread callout given top left however, Counterbore symbols would probably be needed to clarify the callout, there is no dimensioning conflict. The Depths for round holes are measured from the surface UOS.
This is illustrated for C'bores in figure 1-37 mentioned above.
The first c'bore has a depth of .125 from surface, second is .250 from surface, thread is .375 from surface so you end up with .125 of thread (.375-.250).
For the slot B is more correct though you may want to consider adding 'BOUNDARY' - see the reference weavedreamer gave.
KENAT,
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RE: Thread depth in a pocket & slot GD&T callout
After closer scrutiny, the axial thread engagement is approximately equal to the thread diameter, which is a common ratio used for joints that have similar materials for the internal and external threads.
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Thread depth in a pocket & slot GD&T callout
Yes, I agree with you on the dimensioning. Looks like Cory and I must have had the same breakfast.
Dave D.
www.qmsi.ca
RE: Thread depth in a pocket & slot GD&T callout
Quote (ASME Y14.5M-1994 1.8.9 of ):
"The depth dimension of a blind hole is the depth of the full diameter from the outer surface of the part."
So with that said please view the attached pdf for my next question to clarify for me what precisely is intended by the standard. A or B
"Outer surface of part" means precisely what?
RE: Thread depth in a pocket & slot GD&T callout
From my understanding of what was said, for "problem 2", neither of your variations is correct. The depths would both be measured from the surface. The 1.50 dia. hole would reach a depth 0.03 from the surface, and the 0.25 diameter hole would extend an additional 0.22, for a depth from the surface of 0.25.
Of course, I could be wrong. I'm not as knowledgeable as the others that will surely arrive shortly to correct me. Perhaps since the callouts are not in the same note it is different.
-- MechEng2005
RE: Thread depth in a pocket & slot GD&T callout
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
RE: Thread depth in a pocket & slot GD&T callout
The Edge... there is no honest way to explain it because the only people who really know where it is are the ones who have gone over. - Hunter S. Thompson
RE: Thread depth in a pocket & slot GD&T callout
RE: Thread depth in a pocket & slot GD&T callout
RE: Thread depth in a pocket & slot GD&T callout
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Thread depth in a pocket & slot GD&T callout
I personally would say for question 1 B and B are the more correct answers as most agreed. But to know what is 100% correct is key, yes there are ways around using the depth by using sectional views etc, but when you have a part that looks like swiss cheese doing 15 different section views becomes just as confusing as the standard it's self. Supplying a depth attached to the original feature is easy to find and no depth "hunting" required
For question 2 I would say "A" is correct. I am in agreement with ewh.
All I (we?) need is the next generation of the standard is to clear up these interpretation questions. Who do we email these types of questions to? Is a new standard ever going to come out? I know my book for the standard was $165 bucks. $165 x ~50,000 copies is about 8 million bucks! I feel it is a bit over priced for what you get.
When a vendor makes a part wrong due to interpretation, I can't say yup flip to section x.xx and there it is. Some things are clear but the standard to me is 1/3 as thick as it should be. I hope on the next version there are a lot more illustration with perhaps a few example of parts which are fully dimensioned.
There's nothing worst then arguing with a vendor on a standard that is not clear, when you thought it was clear when you put the symbol there in the first place
Is black ice clear?
RE: Thread depth in a pocket & slot GD&T callout
On your second question I believe it's inherently ambiguous and would be difficult to come up with a refined definition in the stndard that corrects this. Arguably referencing them back to a datum may clarify in some situations but perhaps not all.
As to who to contact it says it in the standard in the penultimate paragraph of the Foreward in ASME Y14.5M-1994 on page v.
KENAT,
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RE: Thread depth in a pocket & slot GD&T callout
For the slot, I would pick B.
I would also dim the slot because it's not clear if the dim is to the outside dia or the center of the dia. Either is correct by machinists because they are not defined.
Chris
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