Why the Drill Chart on Your Shop Wall Is Lying to You

Most shop SFM charts were built for uncoated HSS drills decades ago. See why modern coated carbide tooling runs 3 to 5 times faster, and what should replace the wall chart.
SFM Chart by Material: Max’s Guide to Speeds, RPM and Chip Load

Blown up end mill, chattered finish, burned edges that should have been clean. Walk the floor of the shop after a bad run and the tool gets blamed first. Sometimes, it is not the tool. It is the math.