Originally Posted by
dwkfym
Here is an example.
Say the mold was only accurate to +-0.02" (Just example numbers here)
The calipers were calibrated and rated to be accurate to +- 0.01"
Then say my CNC machine will machine parts to 0.02" accuracy.
Then the dimensions of my finished part may be up to 0.05" off. Because the tolerances were stacked.
Theoretically that doesn't mean the part will be off by whatever the total sum comes out to be (in this case, 0.05), but it can be that much off.
/snip.
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