We use a standard Euro connector for the torch. I believe the Pro-Cut 55 to be a blow back start unit.
If that is the case, the Lincoln torch will not work on it as our current ForceCut 80i is a High Frequency/High Voltage start unit.
Also, the Lincoln torch is rated at Max 60amps, where our model is at 80amps with a 60% duty cycle. I fear your torch will not be able to handle the power of the ForceCut 80i. If you wish to change out the torch, Trafimet makes some nice torches that can work with our machine.
Here is a video of our model cutting aluminum:
[ame=http://www.youtube.com/watch?v=C884IwGzAww]LONGEVITY ForceCut 80i High Voltage CNC Ready Plasma Cutter 80AMP IGBT Cutting - YouTube[/ame]
and
[ame=http://www.youtube.com/watch?v=Bal4RSviF1w]Longevity ForceCut 80i Plasma Cutter Demo - YouTube[/ame]
Please give us a call if we can be of more assistance.