On Fri, 18 Nov 2005 15:19:51 -0800, Grant Erwin
wrote:

When the spec says a plasma cutter can cut 3/8", does that mean it can cut 3/8"
in any conductive material?

All the good plasma cutters are rated with three thicknesses: "neat
cut", "ragged cut" and "sever". This is usually in steel and aluminium
needs de-rating to maybe 75% of this. Copper is even worse.