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Old 02-01-2014, 07:25 PM
richf richf is offline
Cobra Owner
Join Date: Apr 2011
Location: New Hampshire
Posts: 800
Default Alumigeddon / mister in action video

I won a battle but not without casualties. I cut two of these 30x17" pieces out of 1/8" aluminum. I used 1/8 endmill for cutting the holes and pockets and broke one of those. I attempted 3 different types of bits on cutting the outside profile shape (as I aborted on one and destroyed two).

Here's a short 37 second clip showing the 1/8 endmill with the mister.

Here are the bit casualties and the end product. I first used a 1/4" 4 flute endmill to cut the profile and slowed it way down but it looked like a spider with the long pieces sticking to it. I stopped it before the aluminum shreds almost cut my mister head. After that, I snapped an upcut from the collet - I'm thinking it wasn't stuck far enough in. I then tried a single flute cutter but I think it was dull, so it basically shredded the cutting edge and it actually bent. I started ramping my cuts after destroying the first bit. I attempted to adjust speeds for each type of bit. I was using 3500 rpm and 20 IPM on the 1/8 endmill that seem to work ok after using new bit and ramping. Last cut was new 2 flute upcut running at 9000 rpm and 120 IPM.
Attached Images
File Type: jpg SAM_2650.jpg (90.9 KB, 151 views)
File Type: jpg SAM_2648.jpg (92.2 KB, 142 views)
File Type: jpg robot-hookarm-pict1.JPG (73.1 KB, 161 views)
File Type: jpg robot-hookarm-closeup.JPG (51.6 KB, 145 views)
Rich F.
CAMaster Cobra 408 X3 w/Recoil
BobCAD v25 4th Axis
Corel Draw X5

Last edited by richf; 02-01-2014 at 08:00 PM.
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Old 04-02-2014, 11:26 PM
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Default What I do.

I use single flute bits at full rpm and heavy mist for .125 bits I set my feed rate at 30ipm. For .25 bits I set my feed at 45ipm. Our machine uses a 4kw spindle. Its a little slower at lower feed rates but I go threw way fewer bits.
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