Calculate Mmc For Hole Position Tolerance Calculator Manuals On GDTĪ quick search of the library or the World Wide Web will yield many training courses and self-study manuals on GDT. Space considerations do not begin to allow a thorough discussion.Īny engineer involved in detailed design or manufacturing will have to master this information. If the hole is actually made with a diameter of 2.018, then the total tolerance on the hole position would be: Note that the use of the maximum material modifier to the geometric tolerance allows the designer to take advantage of all available tolerance. 8.25 If the hole size falls below MMC, additional tolerance on hole location, called bonus tolerance, is allowed.
The circle M symbol also specifies that that this tolerance holds when the hole is produced at its maximum material condition (MMC).įig. The geometric tolerance, as shown by the feature control frame, specifies that the hole must be positioned with a cylindrical tolerance zone of.012 in.įig. The size tolerance shows that the hole size can be as small as 1.960 (the maximum material condition) and as large as 2.040 (the minimum material condition). In addition, the hole is toleranced with a feature control frame.
