Hi all.. here is the answer..
Open tolerance:
These are the tolerance which needs only minor concentration from operator and QC. For ex. as per customer drawing, there may be some tolerance which has variation more than + or -1 mm.. this can be easily achieved..
Close Tolerance:
These are very crucial dimension which needs utmost effort and usually tolerances below +or - 1mm shall be considered as close tolerance.
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An observational drawing is a drawing were you observe an object or drawing and try and make it look as close to the real thing as possible.
respect each other
open
that depends on which museum, unless all museums open and close at the same time right?
open?