Lew:
That sbecause when the program starts up, tool 0 is assumed. Without an explicit change to the right tool , th eG41 command with no parameter will use tool 0, whcih is always a 0 comp. Always a good idea to use the D with the G41, though the D can be anywhere. A d1 could be on a line for example, and will specify the default tool
to use when a G41 is encountered. When an m6 occurs, the D internal variable is repointed to the tool that just went in.
Art