Suggestions when cutting 20 Gage CR Sheet

[rcktscientist]

I have been using my Torchmate Plasma Table/Hypertherm 65 for thicker material building car frames, brackets, etc. Just started using it for art projects, 20 gage cold rolled. I see folks here with crisp cuts on thin metal, trying to get there. Basic settings are .1 delay, .06 torch height, 128 V (sample on), AVHC on, tool width set at .060, lead in .125 90 degrees. Material is 4 inch square. Model A grill is about 3 foot, cut at 45 amps 400 ipm, note divots at lead in and poor corner cuts, so I drew a part and ran trials. Here are the details of the trials, trial number, Amps, Speed.
1, 35, 400
2, 30, 400 Didn't cut through
3, 35, 450
4, 35, 350
5, 30, 350
6, 30, 300
7, 30, 250
Biggest issues are the small holes aren't round, probably due to lead ins, and the bottoms of the V's aren't sharp. Any tips or recommendations would be appreciated.

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