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ISO finish/Grind marks Question

ISO finish/Grind marks Question

I have an ISO standard drawing that I received from korea of a machine weldment.
Certian marks on it are single, double and triple triangles.
I presume they are finish marks.
Do I add machining stock to a surface with 2 or 3 triangles resting on it.  

Legend: V ( VV VVV )

RE: ISO finish/Grind marks Question

A very general answer:

one triangle = rough finish (250 - 500 range)
two triangles = good finish (80 - 150 range)
three triangles = fine finish (32 - 63 range - maybe even better than 32 in some cases)

some three-triangle surfaces might need to be ground for size or runout control, in which case you'd need to leave stock.

These range values are ballpark values, only intended to give you a feel for what the triangles mean.

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