As a starting point, use the test FEED calculated above. Plunge the bit 1 diameter (1X dia) deep (e.g. plunge a 0.0625" dia. tool, 0.0625" deep) and zig to the right and zag back to the left. Increase the feedrate by ΔF: ΔF = 5 IPM (inches per minute) for tools less than 0.0315" (0.80mm) dia. Calculate Speeds and Feeds for 1/2" (0.5 in) 2 flute end mill in Mild Steel at cutting speed = 100(ft/min), Chip Load=0.001(inch per tooth) Calculating Spindle Speed (RPM): Code. When applying oil manually (as in the lab), scale the feed and speed back to 60%, so N = 900 rpm and f = 3.6 in/min (final answer). TIP1: Recommended peck depth when drilling less than 3xD (e.g. 3 drill diameters) with flooded coolant is one drill diameter, or when applying oil manually, or under low pressure, is 50% of drill diameter. We created the Machining Fundamentals series to help you brush up on your CAM knowledge, whether you work in a machine shop or are just getting started. In-house machinists at our Birmingham Technology Center host each episode and provide a detailed overview of a tool/process. In the last edition, we covered Work Coordinate System (WCS).Here we introduce.