FILENAMES: feedchart.pdf DESCRIPTION: This a feed/speed lookup chart for metal cutting. Posted by Paul Amaranth . Paul provided the following description: ================================================================= This is a chart I made up some time ago that I find useful in my shop. It makes it easy to find the right speed for your mill or lathe. These speeds are for HSS tooling; carbide needs to be used at significant higher speeds for best surface finish. For example: You have a 2 inch chunk of low carbon steel you want to turn. The chart on the bottom left shows 130 fpm for a roughing cut. Look on the verticle axis of the diameter, go across until you intersect a line with the desired fpm, or close to it, then drop down to the bottom to read RPM. This example would end up with ~220 RPM. For milling in the same material with a .500 inch endmill, go across the .50 line and read 600 rpm (60-90 fpm cutting speed). For a 4 flute endmill, feed would be .005 * 4 * 600 or 12 inches/minute. These are starting points and need to be adjusted to your conditions. The chart is in color and should print nicely on an inkjet Postscript printer, although it comes out tolerably well on a laser as well. I keep a laminated copy hanging around my shop. I hope this is useful. Paul Amaranth paul@AuroraGrp.Com