Likely a more advanced question, but I’m curious what you guys do when you hear chatter coming out of your #cnc machine.
No chatter here, just something to watch.
Let’s back up though. Chatter is not a good sign when it comes to machining. I describe chatter as the unwanted vibration experienced when machining a part. Chatter will give you sub-par surface finishes and reduced tool life.
I did not include “modify setup” as the poll option, because our very first rule of machining is “Setup is the king”, which should already tell a future machinist what the foundation of every successful machining operation is.
Here we’re strictly talking about what is the first thing you do when you hear chatter even though your setup is spot on. Before we get to see what people think, I’d like to share some of my thoughts about chatter in general. You need to check your tool before you even press CYCLE START. Check tool wear and always machine with appropriate tool size. Always run with appropriate speeds if you need to use small tool. For example, if you have a small radius in a deep pocket, you need to run with decreased engagement and lowered feedrate, because the flute of the tool is long and it’s spinning far from the spindle. Another common problem is when you hold a thin part in a vise and use heavy, large diameter shell mill. You are always more likely to machine without chatter if you swap the shell mill with end mill or even change to smaller shell mill. Second major issue could be your machining strategy, most importantly engagement, either axial or radial. It usually helps to lower the radial engagement when CNC Machining using full flute (like HSM, Adaptive strategies). On the other side, when machining using high speed indexable cutters, lowering axial engagement works great.
Lastly, and what I usually do first when I hear chatter is to play with your “speeds”, my go to habit is to lower spindle speed (RPM) first, and then either speed up or slow down my federate once I establish stable RPM.
How to deal with chatter in CNC Machining?
-Check tool wear and always machine with appropriate tool size
-Always run with correct book-speeds
-Try adjusting tool size, depending on the job
-It usually helps to lower the radial engagement when machining using full flute
-When machining using high speed indexable cutters, lowering axial engagement works great
I ENCOURAGE you all to share your experiences in the comment section below. Posts get way more engagement once we get some conversation going.
Thank You. 🙏
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