When CNC Plasma cutting thicker materials it is normal to get some slag build up around the pierced hole.
To stop the torch from hitting this there are two things we can do.
1. Create a lead into edge of first cut. (this should be normal prcedure)
Start the pierce 10 - 15mm from the line you want to cut then move into the cut so when it finishes the cut
it will not hit the slag from first pierce point.
2. On very thick materials you can use the R-Tech pierce and stop tool program, this will pierce material then the torch
will come back up allowing you to remove the slag by hand and then continue with cut process.
If you need more help please just call our CNC technical department on 01452 733933, for friendly & helpful advice.