Discussion
Tool chatter is caused by which reason?
Answer: B
The key gives excessive clearance angle as the cause of tool chatter.
Clearance is ground below the cutting edge so the flank does not rub on the work. If it is made too large, too little metal is left behind the edge to support it. The weakened edge deflects and springs back under the cutting force, and the tool vibrates against the work, which is chatter.
Too small a clearance makes the flank rub, causing heat, wear and a poor finish rather than vibration. Rake angle mainly controls chip flow and cutting force; a very large rake also weakens the edge, but the trade texts this paper follows list excessive clearance as the cause.
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