The manual for the BOSS 8 says that once you've got TLOs set for all tools, you can set the Z zero by running the current tool down until it touches the top of the work and using SET XYZ to set Z=0.

On mine, when I do this, it seems to only hold until I run an MDI line or run a program - as soon as I hit START CONTINUE it sets the Z zero to the TLO.

As well, the manual states that "QUILL UP or M6 cancels the SET Z and automatically loads the TLO from the tool table." What's the logic behind this? Are you supposed to crank the knee up so the Z zero is at the TLO, or just reset the TLOs for each tool with every job?

Thanks for any advice.