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I always found the ELI5 on gear tolerance super helpful, probably as it boils down to understanding that nothing is ever perfect. When you see "tolerance" in the context of engineering or manufacturing, it basically means the acceptable range of variation from a specified dimension. A gear described as 20mm might actually be 19.95mm or 20.05mm, and still be considered within spec.
The importance of this becomes clear when you think about complex systems. If every single gear in a gearbox had to be exactly its specified dimension, the cost of manufacturing would skyrocket and the assembly might not even work due to minor interferences. Setting tolerances allows for mass production at a reasonable cost. It’s also crucial for functionality; sometimes a little wiggle room is needed for proper operation, especially with temperature changes causing parts to expand or contract.
It makes you wonder how different consumer products would be if tolerance standards were either much tighter or significantly looser. Would things last longer but cost a fortune? Or would they be dirt cheap but break instantly? anyone have examples of where tolerance issues have directly impacted product lifespan or performance?