1. You can't machine cut with a drag tip. It holds the tip too far off for a decent cut on thinner material (and as you found snags the edges)
2. The Workclamp on a plasma is not "ground". It assumes the level of whatever you clamp it to. You may get enough conduction to the workpiece with the workclamp just clipped to the table and letting the grid connect the workpiece, but I have seen circumstances where that caused problems. I always clamp to the edage of the workpiece and if it's dirty or rusty I will wire brush a spot before clamping. |