Avoidance: Use the proper mesh size and quantity of abrasive for the abrasive nozzle you are using. Ensure that your abrasive bunker has a screening device to filter out most contaminants from the abrasive. Use a clean knife to cut open abrasive bags to avoid getting paper from the bag into the abrasive. Use height sensing to maintain constant height during piercing and cutting. Ensure that proximity switches are in-line with the abrasive feed tube to sense when water and/or abrasive backs up in the feed tube
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