Sentence:  Turning of the internal features of horn antennas is an operation where particular attention must be paid to <WSD>swarf</WSD> control. Techniques such as the use of extreme flood coolant, interrupting the feed to break <WSD>swarf</WSD>, and regular withdrawals of the tool to clear the working area may be necessary, particular on CNC [computer numerical control] machines where the operator has no "feel" or sight of the process. 
Meaning of the word marked with <WSD> tags:  The waste chips or shavings from an abrasive activity, such as metalworking, a saw cutting wood, or the use of a grindstone or whetstone. (from mid 16th c.)