Tolerance & GD&T
MMC, LMC, and Bonus Tolerance in CNC Drawings
Material-condition modifiers let a drawing connect feature size with allowable geometric variation. Used correctly, they protect assembly or minimum wall thickness without forcing every part to hold the same geometric tolerance at every actual size. Used carelessly, they create disputes between a supplier’s CMM report, a functional gage, and the
October 26, 2026
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