I am relative new to CNC Laser Cutting Machines and I am having a problem that I have not been able to figure out. I am using a Mitsubishi ML4020-F60 Fiber Optic laser machine. I don't seem to have any issues until I start cutting .375" Mild Steel. According to the chart I should use a 1.2 tip which is the same for .50" steel. It will cut the .50" all day with no issues but if I switch to .375" all of the sudden I have dross issues. I have done and re-done centering until I am blue in the face but I still cannot get rid of the dross and bad edge. What am I doing/not doing wrong? I am attaching some pics of what a part ends up looking like after it has been cut. There is a pic for each side (as the dross issue seems to only happen on one side) so that you will have a reference for what I am talking about. https://reprap.org/forum/read.php?133,859611,859611#msg-859611 Mon, 18 May 2026 17:52:27 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?133,859611,860967#msg-860967 https://reprap.org/forum/read.php?133,859611,860967#msg-860967 gregcunninghamokc Laser Cutter Working Group Thu, 17 Oct 2019 09:50:34 -0400 https://reprap.org/forum/read.php?133,859611,859612#msg-859612 https://reprap.org/forum/read.php?133,859611,859612#msg-859612 VDX Laser Cutter Working Group Fri, 20 Sep 2019 10:59:39 -0400 https://reprap.org/forum/read.php?133,859611,859611#msg-859611 https://reprap.org/forum/read.php?133,859611,859611#msg-859611 gregcunninghamokc Laser Cutter Working Group Fri, 20 Sep 2019 10:43:33 -0400