Sheet metal gets complicated because you have to deal with
  temperature as well but thankfully, the human body only
  tolerates certain working environments [it's hard to cut sheet
  metal by hand in temperature ranges that are incompatible with
  human life, so our narrow range of capabilities makes for a
  small range of potentially viable room temperatures, allowing
  charts like this to functional for most Earth bound purposes
  where human bare-hand usage keeps things consistent].[1]gauge

References

  Visible links
  1. http://icopiedyou.com/wp-content/uploads/2016/03/gauge.png

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