by dezsoe » Thu Mar 19, 2020 12:26 pm
In UCCNC M998 has nothing to do with tool change. (As I see by some web search the M998 is a Mach3 macro for tool change positioning.) You see it at tool change because the M998 is called in the line just before the M6. The error message on the screenshot tells that there is no M998.txt macro in the Macro_Default folder.
Edit: Sorry, it's Tormach specific.