new to aluminium

[radcliffe1978]

hi, ive never machined aluminium before and need help!!!

i want to know the speeds and feeds (formulas) etc for an 80mm facemill with 7 carbide inserts

any help will be great

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[Tribalnewt2]

i would run anywhere from 650-1200 rpm with a feed of 18-30 ipm depending on depth of cut

[eorourke]

It depends on the carbide inserts you are running. Are you using an uncoated grade that are polished for aluminum. If not then you will not get a good finish. Also lead angle can be important. Finally, I would calculate 1200 RPM @ .15MM per tooth chip load or 1260 per meters per minute feed rate.

Please let me know what depth of cut you are taking and horse power on the machine.

[Superman]

I'd go even faster with the uncoated Alum. tips

Cutting speed up round the 700-1000 m/min ( Ø80 = 3000 RPM, @ 0.15/tooth x 7 teeth (F3000.) DOC 2mm max , ae=50% (stepover), use coolant to stop the chip weld

I use a Ø63, 5 tip Octo facemill @ 5000 RPM Fz=0.12 ( F3000. ) flood coolant

Using just air will always fail due to built-up edge ( chip weld )

[RCaffin]

Using just air will always fail due to built-up edge ( chip weld )

Possibly so, especially with the softer alloys.

However, pulsed misting (with airblast!) does work well. I use 3 parts kero to 1 part olive oil, 0.5 S pulse every 15 - 30 seconds, depending. This is something you have to tune for YOUR machine. Just keep the cutter slightly wet.

Cheers
Roger