1.5 KiB
aliases
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Properties
Chatter
Chatter is when the machine and the workpiece are in a spring system and the tool is catching the workpiece in a wave pattern. This means that the finish will not be smooth, but in waves. Blondihacks explains it with butter, which is a good analogy. When you take butter with your knife and you slip and catch in waves.
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Physically it happens when the cutting pressure (the force between the workpiece and the tool) exceeds the rigidity of the machine setup. This means in order to solve it we can increase rigidity or decrease the tool pressure (slower feed, )
Increasing Rigidity
As a rule of thumb we want everything close and tight. The further things stick out, the larger the lever and the more it can vibrate and thus introduce chatter.
- is stick-out too far
- Are we using a tail support?
- can you use tail support
- are all slides tight?
- are spindle bearings tight?
- Is the chuck tight?
- Is tool-bit sticking out too far?)
Tool Pressure
- Is tool dull?
- Is tool round for nice finish (more cutting surface --> higher pressure)
- deep cuts have higher tool pressure
Techniques
Turning to a Shoulder
This video explains it well. The problem is that
Tutorials
Eine gute Tutorial-Serie ist von Blondihacks auf Youtube.