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minus, minus tolerances

This isn't a PC-DMIS question but I thought someone here might know the answer. What is the logic behind having a Ø called out at 20.0mm with a -.007 / -.04 tolerance. Why not just make the Ø19.993 +0 / -.033?
Parents Reply
  • That's nice. Now we can stop wondering why airplays are grounded because parts don't fit, automakers recalling millions of cars because parts fail prematurely & appliances fail after 1 year. I will be keeping my 1970s built fridge as long this thing keeps chilling sausages & cheese I keep buying.
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