I believe the arc writer uses an electrical arc to effectively gouge the material, leaving a small depression in the material where the torch moves. The Plate marking attachment uses pneumatic air pressure to push against the material with a vibrating tip leaving a small, clean depression in the material.
I like the Plate Marker for it's accuracy and consistency, as well as the speeds you can travel at with it. It's a fair bit on the noisy side, just a fair warning!


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