Haha if you’re in the swamp then I am as well. I agree that both of those options are valid, depending on the function of the part.
One clarification regarding if E CT is the way to go, you would actually say 2x/2x ø6 CT. To indicate that there are 2 groups with two holes in each group that are...
You could use CZ CZ, or sim, or simply treat them as 4 continuous holes with CT and Envelope.( See attached option B) Or a combination of some of these options, it all depends on what function the holes will serve.
@pmarc Well haha I stand corrected then. Could you give an example of how they might differ?
I understand the difference between ISO and ASME when rule 1 is applied when it comes to extracting planes or axis from surfaces and features of size
But doesn’t flatness of a derived median plane...
Well, here’s the update.
@greenimi you were absolutely correct. I even contacted a guy I know at the ISO committee and they confirmed in this instance ISO and ASME work the exact same way when it comes to flatness of DMP.
@3DDave we came to the conclusion today to move the holes up one level...
@greenimi I will have to check that out first thing in the morning as I’ve gone home for the day and have no access to the ISO standards at home unfortunately.
@3DDave I’m aware of the envelope symbol as we use it quite often on holes. That could be one alternative, but usually our suppliers...
Thanks greenimi, I already read the thread in question but I’m not sure how/if it applies in my situation with flatness of a FOS. I understand the difference between ISO and ASME in your thread, but not if it’s explicitly not allowed to use DMP flatness in ISO.
I found the same passage as you...
After a drawing review concerning a print with a callout of flatness of a feature of size as pic related we were told by the manufacturer that it’s impossible to verify. Essentially that flatness of a derived median plane/feature of size is not possible and that we should specify one plane as...
Well, CT is most commonly used when several features of size are to be considered as one.
Imagine a pipe with a groove in it (all coaxial) You want the diameter before AND after the groove to be evaluated as one diameter, not two separate ones as is the default in ISO if you do not state...
If your callout is exactly as the provided picture then I would say that your third strategy is the way to go. Create two planes, one on each side of the slot, from those planes you create a median plane. Then you compare the location of that median plane to the location of plane A. In ISO thats...
