Close this search box.
Close this search box.
Close this search box.

Arc Filter 101 – Improve High-Speed Toolpath Efficiency in Mastercam 

Arc Filter 101 - Improve High-Speed Toolpath Efficiency in Mastercam

Arc filtering is a powerful technique in Mastercam’s tricordial toolpaths that can greatly enhance the efficiency and performance of your machining operations. In this blog post, we will explore the benefits of arc filtering and how it can be applied to optimize toolpaths, specifically focusing on 2D high speed dynamic mill and OptiRough. Join us as we delve into the world of arc filtering and discover how it can revolutionize your machining processes. 

Understanding Arc Filtering

Arc filtering is a technique that can greatly improve the efficiency of CNC toolpaths. With the help of arc filtering, you can make your toolpaths smaller and more efficient by reducing the linearization of toolpaths, transforming them into smoother, arc-flowing motions. By implementing arc filtering, you can achieve a variety of benefits, including reduced toolpath size, smoother machine operation, and improved overall machining performance. 


Tricordial toolpaths, such as 2D High-Speed Dynamic Mill and OptiRough, are widely recognized as some of the best toolpaths available in Mastercam. However, by default, these toolpaths do not have arc filtering enabled. This means that they rely heavily on linear motion, resulting in longer lines of code and potentially inefficient machining processes. By leveraging the power of arc filtering, you can optimize these toolpaths for superior performance. 

How to Enable Arc Filtering

The initial step is to allow the toolpath to use arc filtering and enable curve creation in all three planes. While this step may not significantly reduce the toolpath size for flat surfaces, it sets the foundation for further optimization.  In tricordial toolpaths with micro lift motions and entry motion, enable arc entry motion or 3D arc entry motion. This will improve the performance of profile entry motions, leading to further size reduction in the toolpath. 


To achieve the best results, experiment with the bias slider and adjust the cut tolerance and arc tolerance percentages. Finding the sweet spot that balances efficiency and precision is crucial. As a starting point, consider a 25% cut tolerance and 75% arc or line arc tolerance. 


Implementing arc filtering in tricordial toolpaths can yield remarkable results. By minimizing linear motion and maximizing arcs, you can create toolpaths that are not only visually smoother but also run more efficiently on CNC machines. You’ll notice reduced program size, enhanced machine performance, and increased cutting speed. Moreover, the machine will have more time to breathe between lines of code, resulting in a happier and more productive machining process. 


As a CNC programmer, you have the power to optimize your toolpaths and elevate your machining capabilities. Arc filtering is a game-changing technique that can significantly enhance tricordial toolpaths in Mastercam. By following the steps outlined in this video, you can unlock the benefits of arc filtering and achieve smaller, more efficient toolpaths.  

Technical Support

Get help from our team by Calling us at 800-364-1652 x 3. You can also get assistance by clicking the Technical Support button or the Email Our Experts button below. 

About the author

Want to learn more about 3DEXPERIENCE Solutions?

Scroll to Top