http://www.cncfuture.com/what-is-the-minimum-spindle-rpm-speed-to-mill-aluminum-w-cnc-mill/ CNC News on the Future of CNC Sat, 31 Jul 2010 05:34:56 +0000 http://wordpress.org/?v=2.9.2 hourly 1 http://www.cncfuture.com/what-is-the-minimum-spindle-rpm-speed-to-mill-aluminum-w-cnc-mill/comment-page-1/#comment-1323 gpbulloc Sat, 09 Jan 2010 05:30:11 +0000 http://www.cncfuture.com/what-is-the-minimum-spindle-rpm-speed-to-mill-aluminum-w-cnc-mill/#comment-1323 Depends on the tool size. For 2024-T4/T6, 2014, 6061-T6/T651, 7075-T6 types of aluminum, you want a cutting speed of 800-2000 FPM, which for a 1/4 " tool would be a minum of 12,200 RPM. For 440, 356, 380, C61300 types of aluminum, use 500-1000 FPM. The formula for converting FPM tp RPM is: Spindle Speed [RPM] = cutting speed (in inches) (pi*tool diameter). / Basically, find the circumference of the tool, divide the cutting speed by the tool circumference and that tells you how many times the tool will need to go around per minute to achieve the proper cutting speed. A larger diameter tool will go slower because it cuts more metal per revolution of the tool. Depends on the tool size. For 2024-T4/T6, 2014, 6061-T6/T651, 7075-T6 types of aluminum, you want a cutting speed of 800-2000 FPM, which for a 1/4 ” tool would be a minum of 12,200 RPM. For 440, 356, 380, C61300 types of aluminum, use 500-1000 FPM.
The formula for converting FPM tp RPM is:
Spindle Speed [RPM] = cutting speed (in inches) (pi*tool diameter). / Basically, find the circumference of the tool, divide the cutting speed by the tool circumference and that tells you how many times the tool will need to go around per minute to achieve the proper cutting speed. A larger diameter tool will go slower because it cuts more metal per revolution of the tool.

]]>