ISO-SRF takes the normal vectors of a surface. If it is facing inside, you have to flip the normals of the surface, either in Rhino or in Grasshopper.
Regarding Orient: ISO-SRF takes the tool tip from the surface and the tool vector from the normals. Due to the robot's 6 degrees of freedom it can also rotate around the tool axis itself. Orient defines towards which point (around the tool axis) the tool is facing. Usually a good position for the Orient point is somewhere close to the robot's "center", i.e. axis A1.
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