Thread: Single flute carbide cutters
Obviously the best way it to pump the coolant directly over the cutter, but that's not going to end well with an MDF bed!
This discussion has got me very interested.
I have a sherline mill, ive currently got hss 4 flute roughing end mill and i can safely goto 0.3 DOC at 350 mm/min. so cutting ally takes forever and the finish is shit tbh...
Do you think a single flute carbide cutter will be good for me??
Edit: i use WD40
Depending on Max spindle speed you should easily double those figures.! (If machines upto it.?). . . Chipload is the key to cutting Ali (And most other materials) send the heat away with the chip and you'll be surprised just how deep and fast you can cut in Ali.!
Most of my work is cutting Ali and find blown air to clear chips mixed with the odd squirt of WD40 type fluid works best.
my spindle is 2700rpm max
if thats the case i will buy some.
will it give better finish to the work too?
If I need fine finish then I just use a finish pass of 0.2mm and moderate feed rate.
Really you will need to play with your machine for the best balance regards ideal cutting speeds as every machine is differant but don't be affraid to let rip.!. . . You'll know when you've hit the sweet spot by the sound and the nice stream of chips flowing off the cutter.! . . . When a single flute is cutting sweet it's like taking a piss after you've been busting for hours.!! . . . Strong flow and nice Arghh sound. :rofl:
4 flute end mill doesn't leave much space for chips at all, so they're going to get re-cut / rub etc causing the poor finish you describe. 0.3 DOC at 350 mm/min is pretty pathetic ... as Jazz said you should be able to get a lot more than that.
On my router, which compared to a mill isn't very rigid, I've been using 1.2mm DOC (sometimes 2mm for short periods) at 700mm/min and 12000rpm. Clear the slot of chips and put some cutting fluid in it before the cutter gets round.
Since your max spindle speed is 2700rpm, not 12000rpm, you want to reduce the feedrate roughly proportionately for the single flute cutter to get the same chip load and increase the depth of cut.
The video I posted earlier in the thread should give a reasonable idea of what it looks/sounds like. Finish is generally good - here's an example where I didn't do a finishing pass as such. 23mm thick if I recall correctly:
And another with a different grade of aluminium (showing how grade can make a big difference):
Thanks for the replies guys. ive hated watching the slow shitty speeds ive been running.
Gonna get some on order
that took about hour n half
dont suppose anybody has one of these spare i can buy, china are gonna take forever to get here and i wanna get cracking on!
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