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Basic numbers

wrangler325
Team,

Is it ever acceptable to give basic numbers tolerance from a Profile of a Line feature control frame to report that Profile, instead of actually reporting as Profile, the basic numbers are reported? I may be wrong, but I do not agree with reporting profile this way as I have been told by another.
My understanding is Basic numbers never get tolerance, no matter what.

Thanks for any input.

Greg.
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  • At my shop we normally assign an internal tolerance. If a feature has a T.P. of .030 and it is a 2D location, the basic X and Y dimensions are +/-.010. That way, if both are within .010, the T.P. is .030 or less. When reporting to the customer, it is what it is and no tolerances listed.

    If some of your machinist don't know the formula for Position, Just Tell them to take your highest number that's off from there basics, times it by 2, take there smallest number and divide it by 2, add the 2 together and it isn't perfect but it will get them real close to the actual position.
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  • At my shop we normally assign an internal tolerance. If a feature has a T.P. of .030 and it is a 2D location, the basic X and Y dimensions are +/-.010. That way, if both are within .010, the T.P. is .030 or less. When reporting to the customer, it is what it is and no tolerances listed.

    If some of your machinist don't know the formula for Position, Just Tell them to take your highest number that's off from there basics, times it by 2, take there smallest number and divide it by 2, add the 2 together and it isn't perfect but it will get them real close to the actual position.
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