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Straight answers to the questions people ask most when choosing and running a workshop and industrial plasma cutter.
Start with the thickest metal you cut regularly and choose a machine whose recommended cut thickness is comfortably above it. The recommended figure is for a clean, efficient cut; the severance figure is the maximum and is slower and rougher.Then check the supply it needs, the torch type and length, the duty cycle, and the air requirement.
It usually relates to the machine's output current or its general capability, with larger numbers meaning more power. Always rely on the stated specifications rather than the name: input voltage, output current, duty cycle and recommended cut thickness.The data plate and manual are the reliable source.
Only if the maker designs it to. Some smaller machines accept more than one supply voltage, while larger machines are normally made for a single supply, often three-phase.The data plate and manual state the supply the machine accepts, so check them and never assume. Have a qualified electrician confirm that your supply and protection are suitable before connecting, and do not use an adaptor to get around a mismatch.
A longer torch lead lets you reach large workpieces without moving the machine, but a longer lead also adds weight and can be more awkward to handle. A shorter one is easier to manage on bench work.Choose the length that suits your workspace, and avoid coiling excess lead tightly while working.
Torch and consumables are specific to the torch design and to the current you cut at. Identify the torch from the machine's manual or the torch's own marking, then use the parts list for the correct electrode, nozzle, swirl ring and shield.Mixing the wrong parts leads to poor cuts and damage.
Plasma cutters need clean, dry compressed air at the pressure and flow stated in the manual. Moisture and oil are the biggest causes of short consumable life and poor cuts.Fit a filter and moisture separator, drain it regularly, and use a compressor that gives the flow needed.