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CNC plasma cutting is great when everything’s set up properly but even small mistakes can spoil the finish. If you’re cutting stainless steel or aluminium on a CNC table, it helps to go through a few basic checks whenever the cut quality drops off.
Check the Cutting Direction
The plasma arc usually spins clockwise and because of that, the cleanest and most square edge will be on the right-hand side of the torch as it moves forward. If your edges don’t look right, check that the contour is being cut in the correct direction. If needed, change the direction in your CNC settings as it can improve edge quality straight away.
Use the Right Settings for the Job
Always follow the cut charts for your machine and the settings should match the material type, thickness and the finish you want. Gas type and pressure must also be correct, especially if you’re using a dual-gas system. Make sure the torch height, arc voltage and cutting speed are set properly and double-check that you’re using the correct consumables too. It’s also important to be safe at work and follow the UK’s Health and Safety Executive rules for working with machinery.
Also, if your workshop uses other processes like thermal plasma spray, like the examples seen here, www.poeton.co.uk/surface-treatments/thermal-metal-sprays/plasma-coatings, remember that plasma cutting has its own specific settings that shouldn’t be guessed.
Keep an Eye on Consumables
Worn nozzles and electrodes will quickly reduce cut quality. Inspect them regularly and replace both at the same time and don’t over-lubricate O-rings, as that can cause problems.
