Originally Posted by
dwg123
I need to drill 7/16" diameter x 2" deep holes in 6061-T6 aluminum. Making 50+ parts, 9 holes each. Problem is my cnc router doesn't have low-rpm torque. How do people with high-speed spindles mill or drill deep holes?
Or should I use a smaller end-mill, spiral cut the hole & try to evacuate the chips the best I can? Would high pressure compressed air (mist) or medium pressure flood remove chips from this deep pocket better?
Right now I'm thinking a combination of using carbide-tip twist drills, pre-drilling a 1/4" pilot hole + shallow pecking might have the best combination of job time/tool cost/etc and might be the best way to go.
Or am I missing something? I'm pretty new to the cnc-machining game so if some folks with actual experience could tell me what works best I'd really appreciate it.
Thanks