QUESTION
I have a project involving two irregular shapes which must fit inside each other without interference. I’m trying to figure out if I have the GDT notation correct. The attached picture should explain itself. Anyone care to offer a suggestion?
REPLIES
SeasonLee
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When Profile control is specified without datum references, it will control the form only. For your irregular complex feature surface application, I will recommend to specify with datum references since it will control the size, location, orientation and form.
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Profile tolerance may be combined with positional tolerancing where it is necessary to control the boundary of the feature, ASME Y14.5M standard Fig 6-19 is an excellent example on your application.
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You need to add an “all around” symbol on bend of the leader line to specify the profile tolerance zone covers all surfaces around the outline of the feature.
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Material modifier MMC is not allowed here, but it is allowed on datum.
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To avoid the interference, I will recommend:
- To choose unilateral inside tolerance for male part.
- To choose unilateral outside tolerance for female part.
SOURCE
https://www.eng-tips.com/viewthread.cfm?qid=246199
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