Why Your Endmill Is Rubbing, Not Cutting

Most machinists know when a tool is worn. Far fewer know what's actually happening at the cutting edge when it gets there. This video breaks down the real physics of tool wear: what rake angle and relief angle do when a tool is sharp, what happens when that edge rounds over, and why the instinct to drop your feed rate can actually make things worse by reducing the chip's ability to carry heat away from the cut. We also cover the four warning signs to watch for before a worn tool becomes a real problem, and what tool selection, substrate grade, and coating actually mean for how long your tooling lasts in production. 0:00 — The difference between cutting and rubbing 0:22 — Rake angle and relief angle explained 0:58 — What a dull edge actually does to your cut 1:18 — How wear progresses and what each stage costs you 2:05 — Four warning signs to catch wear before it catches you 2:48 — Tool selection, coatings, and what to look for 🔗 Shop cutting tools → https://shop.wcchapman.com 📞 Talk to our team → 410.686.6860 📖 Full technical breakdown → https://wcchapman.com/stop-smoking-yo...