English Author: Site Editor Publish Time: 2025-11-27 Origin: Site
When the Angle directions of the c-axis of the turning and milling compound machine tool are opposite, it is usually necessary to adjust the rotation direction by modifying the parameters of the numerical control system or the post-processing Settings. The core solution is to check and correct the rotation axis direction setting in the machine tool control definition, post-processing file or equipment parameters. The following are the specific operation steps and precautions:
Confirm the root cause of the problem
First, it is necessary to verify whether the C-axis direction is indeed opposite. The rotation direction of the C-axis can be tested through a simple program (such as G01 C90). If the actual movement is opposite to the direction of the programming instruction (such as the instruction rotating forward but reversing), adjustment is required.
General adjustment method
Modify control definitions or machine tool parameters : Enter the parameter setting interface of the numerical control system and search for parameters related to the rotation direction of the c-axis (such as the " reverse rotation axis" or " positive indexing direction" options). Change the parameter value from "reverse" to "normal" or adjust the indexing direction.
Check the post-processing file : if the problem occurs in the NC code generated by the programming software, the c-axis rotation direction parameter needs to be modified in the post-processing file. For example, in Mastercam post-processing, set the rotation direction of the c-axis to counterclockwise or adjust the polar coordinate interpolation rule.
Verify equipment parameter matching : Ensure that the machine tool parameters are consistent with the post-processing Settings. For example, the Y-axis of and the polar coordinate mode of should both have diameter outputs to avoid direction errors due to parameter conflicts.
System-specific adjustment reference
FANUC system : Search for the "reverse rotation axis" parameter in the parameter Settings (such as #8130 series), and modify the direction marker corresponding to the c-axis.
New generation system : Adjust the parameter 224/226 (c-axis rotation mode) or the indexing positive direction parameter to ensure it matches the program logic.
Siemens system : When using the TRACYL (cylindrical conversion) or CYCLE800 (planar rotation) function, the rotation direction needs to be confirmed by the right-hand rule, and the correct axis vector should be set in the program.
