Siemens SINUMERIK 840D sl Programming Manual page 340

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Tool offsets

8.5 Activate 3D tool offsets (CUT3DC..., CUT3DF...)

Face milling

For this type of 3D milling, you require line-by-line definition of 3D paths on the workpiece

surface. The tool shape and dimensions are taken into account in the calculations that are

normally performed in CAM. In addition to the NC blocks, the postprocessor writes the tool

orientations (when five-axis transformation is active) and the G code for the desired 3D tool

offset into the parts program. This feature offers the machine operator the option of using

slightly smaller tools than that used to calculate the NC paths.

NC blocks have been calculated with a 10 mm mill. In this case, the workpiece could also be

machined with a mill diameter of 9.9 mm, although this would result in a different surface

Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

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