--- title: Effective Feed Rates, Chip Thinning using a Ball Nose and Understanding Angle of Attack description: This Tool Tip features useful information on effective feed rates, chip thinning using a Ball Nose and understanding angle of attack (AoA). image: https://blog.fullertontool.com/hubfs/July%20Tool%20Tip.png --- Menu [![fullerton](https://blog.fullertontool.com/hubfs/raw_assets/public/Fullerton_June2021/images/fullerton-logo.svg "fullerton")](https://fullertontool.com/) Close - [Search Tools](https://fullertontool.com/search) - Products - [End Mills](https://fullertontool.com/products/end-mills) - [Drills](https://fullertontool.com/products/drills) - [Drill Mills](https://fullertontool.com/products/drill-mills) - [Burrs](https://fullertontool.com/products/burrs/burr-rotary-files) - [Keyseat Cutters](https://fullertontool.com/products/keyseats/4375-general-purpose) - [Saws](https://fullertontool.com/products/saws) - [Reamers](https://fullertontool.com/products/reamers) - [Countersinks](https://fullertontool.com/products/countersinks) - 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As materials change, the cutting tools developed to machine those materials must change.  It is important to understand proper ways to control the feed rates at the Angle of Attack (AoA) on the workpiece. Chip thinning occurs at the cutting edge and important to remember when maintaining effective feed rates at the cutting edge.  Also, it is very important when using a ball nose to understand the change in speed when moving closer to the center of the tool.  See example shown below. ***Example: .500" Diameter and an Angle of Attack (AoA) of 20 degrees*** Chip thickness at full diameter. As programmed .005" IPT ![July Tool Tip.png](https://blog.fullertontool.com/hs-fs/hubfs/July%20Tool%20Tip.png?width=433&name=July%20Tool%20Tip.png "July Tool Tip.png")                   Chip Thinning at the Angle of Attack (AoA).  In this example the AoA is 20 degrees. IPT is .0017" at the AoA SFM is 72 SFM - The diameter at the contact zone is only .17" Programmed SFM is 200 at a full .500" tool diameter Thanks for checking out our tool tip about  effective feed rates, chip thinning using a Ball Nose and understanding angle of attack (AoA).  If you have any additional questions, please contact our Engineering team at 989.799.4550 or [engineering@fullertontool.com](mailto:engineering@fullertontool.com). Tags: [Tool Tips](https://blog.fullertontool.com/topic/tool-tips), [tool tip](https://blog.fullertontool.com/topic/tool-tip), [chip thinning](https://blog.fullertontool.com/topic/chip-thinning), [angle of attack](https://blog.fullertontool.com/topic/angle-of-attack), [ball nose](https://blog.fullertontool.com/topic/ball-nose), [ball end type](https://blog.fullertontool.com/topic/ball-end-type), [effective feed rates](https://blog.fullertontool.com/topic/effective-feed-rates), [aoa](https://blog.fullertontool.com/topic/aoa) [Back to Blog](https://blog.fullertontool.com) ## Related Articles ## [Chip Thinning - Saws](https://blog.fullertontool.com/chip-thinning-saws) Have you noticed Fullerton’s Saw feeds are much greater than other saw manufacturers?The reason is... 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