Two hours later, Sarah returned, holding a casing and the sensor module. She slid the sensor in. It seated with a satisfying, smooth thunk . It wasn't a forced press fit; it was a functional sliding fit.
Elias sighed. In his haste to get the design out, he had relied on the manufacturing team to just "make it fit." It was a rookie mistake for a senior engineer. Now they had a crate of parts that were technically "exact," but practically useless because metal expands, contracts, and vibrates. iso 2768-mk
"The 'm' stands for . This applies to the linear dimensions—lengths, widths, and diameters. It’s the middle ground. It’s not loose like 'coarse,' and it’s not expensive like 'fine.'" Two hours later, Sarah returned, holding a casing
"The 'K' class covers ," Elias explained. "It controls straightness, flatness, and perpendicularity. For a 25mm surface, class K allows a perpendicularity error of 0.4mm. It ensures the part isn't twisted like a pretzel." It wasn't a forced press fit; it was
"Can we re-machine them?" Elias asked.
"Within 0.2 degrees. Well within the 'K' limit for perpendicularity."
"That’s the problem, Elias," Sarah said, tapping the paper. "You specified the nominal size. But you didn’t tell the machinists how much variance is allowed. You didn’t put any tolerance blocks on the drawing."