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14-11-2018 #1
I am looking for a little guidance on feeds and speeds with a 2kw 3040 size gantry router (not chinese - this one has 20mm hiwin linear rails).
I want to take a light skim over a large area of ali plate. (no idea what grade it is).
So after googling about and looking at the feed and speed calculator on littlemachineshop's site, it appears that if I am using an HSS 12mm 4 flute endmill, the spindle speed should be very slow at 1600 rpm and the feed also slow at 275 mm/min.
Switching to a carbide endmill, a much higher spindle speed, 7200rpm and much much faster feed of 2800mm/min.
Does that sound right?
I have seen people using very fast spindle speeds and feeds (16k prm, 4000 mm/min) but not sure with a 12mm cutter?
Any general advise regarding this topic?
Obviously lube/cooling comes into play here, but initially I would like to run the machine dry or with a minimal mount of lube.
I am looking at taking a very shallow cut as I am just getting the plate flat, so no more than a 0.1 or 0.2mm cut.
Any advice welcome.
Cheers!
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14-11-2018 #2
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14-11-2018 #3
Google feeds and speeds calculator , it will take you to the little machine shop, input max spindle speed, material, mm/inch, cutter size and material and flute count. Hit calculate
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14-11-2018 #4
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14-11-2018 #5
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14-11-2018 #6
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14-11-2018 #7
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14-11-2018 #8
I'm using 0.1-3mm Mills I have a bin full of shafts without ends lol.
It's scary when it looks like it's smashing side on into a piece of brass stock. But in all honesty since I used the calculator I just back the feed off slightly. It's fine. Then I let it run at the feed rate... Still fine.
My cut depth is 0.5mm I cut at 1mm but scared the shit out of me.
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14-11-2018 #9
Oh not with mills below 0.5mm I broke all those, my machine isn't quite gentle enough
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15-11-2018 #10
Just found GWizard.
It's telling me, for a 12mm 4 flute endmill in cast ali, 4148rpm and 427 mm/min for HSS.
For Carbide 6222rpm and 525 mm/min.
That seems very consvative.
If I set the surface finish from 1% to 30% the feed rate doubles.
If the tool size drops to 4mm then the RPM goes up to 18666!
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