You must use a post from the 4thxs directory. Normal posts do not support 4th axis wrapping.
The post CNC files have the indexing axis hard coded. Most are setup to rotate about the X axis. The axis of rotation in your program must match the rotation axis of the post.
If you are rotating about the STOCK X axis the X axes of the setups must be parallel to the world X axis.
If you are rotating about the STOCK Y axis the Y axes of the setups must be parallel to the world Y axis.
4th axis wrapping is not simultaneous motion of 4 axes. Only three axes are active. In the case of X axis wrapping, you get X and Z translational motion and a rotation around Y.
2D simulation does not work for 4th axis wrapping.
If you are using Cut Sides perpendicular to index axis the following restrictions also apply:
It does not apply to simple slots and grooves.
The curve of the feature cannot have any sharp corners.
If you are wrapping an open profile side, the Insert arc checkbox of the Stepovers tab should be checked.
If you preview the toolpaths and are getting wild moves at the feature edges, select a smaller tool. Often the automatically selected tool is too large. Most problems using cut Sides perpendicular to index axis are related to using a tool that is too large. Make sure the tool is small enough before making the changes discussed in item 5.
If the finishing pass for the walls of the feature does not immediately follow the roughing pass, you may need to adjust the plunge point for the finishing pass to ensure that it plunges near the center of the feature. You want to avoid plunging near the outside walls where the Y displacement is the greatest. If the initial move of the finish pass gouge, adjust the plunge point for the finish pass.
See also Fourth axis overview.
