Hi new here, using a Swiftcut 4x4 cnc plasma table-Hypertherm 105 machine, I usually cut 1mm-1.2mm ss and 10mm ss, for some reason when i cut a circle in the 10mm ss, I am not getting a clean cut, a little bit is left uncut, so a hammer is needed, very annoying, the table was bought new and has had little use, it cuts thin ss perfectly. any ideas?

Cheers Dave