Every machinist must deal with chatter. Manual machinists deal with chatter. CNC'ers deal with chatter too. It really doesn’t matter the source of the chatter. Whether it is chatter is from the tool or chatter from the work, how you deal with chatter is what matters. By the way, this isn't the chatter during smoke breaks or the banter in the lunch room. This is the resonance caused when either the tool or the piece vibrates. Don't be so quick to blame the tool, the workpiece, or the machinist. Blame physics. Chatter is physics in action. You get chatter at all speeds and with all materials. It's a bigger problem the faster you machine. A good machinist knows that chatter must be vanquished.
You get workpiece chatter when the wall of your work starts to vibrate. Minimize this by maintaining as much rigidity as possible in workpiece for as long as possible. Remove less material in each pass and make more passes. The CNC Cookbook
recommends upping rigidity by adding a material that is easily removed once the work is done. They go as far as recommending a mixture of petroleum jelly and lead shot! Additive manufacturing to achieve subtractive manufacturing. What a concept! Workpiece chatter is more of a problem when you literally cut corners. The geometry of the engagement increases the number of teeth in the cut. This increases the cutting forces and causes chatter. Use a larger initial radius to make the first cut, and then remove the remaining stock in another pass.
The machine is the home sweet home of chatter. The machine, the tool holder, and the tool are all sources of chatter problems. These parts want to naturally vibrate. Don’t let chatter limit your machining. Your only limits should be the limits of your machine, your tool, and your material. Here’s some things to keep in mind in reducing chatter. Speed
. Instinct makes you want to go slower. Fight that urge. Speeding up might be the right. If chatter starts, speed up. That sweet spot is probably higher; not lower. Create a Stability Lobe Diagram
to help. Get help from companies that specialize in analyzing your tooling equipment and creating the diagram for you.
Use the Right Saw Arbors
Invest in saw arbors
that were built from the ground up to minimize chatter. You know CNC. So you know chatter is natural. Your job is to find ways to reduce it. The Tool Company
knows a thing or two hundred about CNC too. We only carry saw arbors made by Sierra American Multi-Systems
. They invested serious R&D in Vibra-Core technology to reduce cutter vibration. Vibra-Core is a special heat-treating process. It gives you rigidity and extra support for your cutter. Every saw arbor made by Sierra American and sold by The Tool Company incorporates Vibra-Core in the design. Like everything we sell, these quality saw arbors
are made in the USA and are backed by a 5 year warranty. Stop chatter before it starts. Order your saw arbor