The 60 Amp unshielded parts are rarely used....they have a very few applications for robotic or 3 dimensional jobs where the ability to get the torch in real tight spots is more important than cut quality or consumable life. These unshielded parts simply do not perform as well for the majority of cutting applications. In regards to aluminum cutting with Fine Cut parts.....I don't have a good answer for you! I use FineCut parts for aluminum....I suspect that our process engineers had specifications to improve stainless and carbon steel thin sheet cut quality....and they never tested these parts on aluminum. I'll check it out and see if we are working on anything here!
I have the newest Powermax 45 on my PlasmaCam....totally new torch design.....it is the sweetest cutting air plasma I have ever used.
Best regards,
Jim