Reference on a drawing?
In engineering drawing I keep seeing the word Ref, I was tolt this means reference, can someone add more to this as I don't quite get it, does it mean the draftsman don't know the true length of the line or does it mean its a reference to maby another dimension? I am lost and confused?
a 'ref' is added to a dimension if you don't really need it - usually something like an overall dimension if you already have smaller bits dimensioned which when added up give you the overall dimension. It's more like a double check plus it is also used to keep tolerances under control.
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