You probably need to slow down your travel speed or your plasma isn't big enough. 100 amp up til 3/4" should give you good results with minimum kerf, anything over 1" 200amp min. Our table will cut 3/4" laser straight, anything more I usually only burn myself if I am in a pinch.We have a plasma CNC at my shop, what are you wanting to do with it. I'll tell you Now, edges are not crisp and clean. They look pretty much like the edges if you used a handheld IMO.
Water bed, the plate rests in a bed of water. I am somewhat removed from the daily costs. After initial costs, just electrcity and plasma consumables would be your expense. I can't even remember what tips costs these days, I'd have to look it up. But an entry level table here starts at about $30,000. If you want to get serious then $80,000-$100,000+?you are right it does look kind of hobbyish. i have actually been more interested in this table http://www.fastcutcnc.com/elite.php with a ThermoDynamics AutoCut300 for working on material up to 2 inches thick.
what is the difference between a air bed and a waterbed? profability? cost? cost of operation and ease of use?
Not hard at all, you can draw and nest your shapes with the cam software that comes with the table, the lower medium level tables this can be simple to very cumbersome. Even the high end tables that I have drafted burn patterns for have horrible user interface for drawing directly on the table. Best to invest in a CAD program and import your files.how hard would an entry level table be to operate