Thread: Group Buy - End Mills?
I got one of the X5070 Blue end mills from Cutwell tools recently. It is a 6mm dia. cutter with only 6mm flute length, but it has a very slightly reduced shank above the flutes so it can reach to cut 15mm depth, provided you take 6mm passes.
I think this works really well because it is super stiff and gives a great cut quality. However they are expensive!
I was thinking about getting some of the 6mm K2 stub end mills that have 8mm flute length and then having the shank reduced above the flutes so it can reach 20mm (standard they have 6mm dia. cut and 6mm shank so will rub slightly if you cut deeper than the flutes).
Would anybody else be interested in these? I guess the price could be better if I buy more.
Much much better option if cutting Ali or plastics and not much more expensive than X Blue range are the Karnasch 1 flute. They have flute lengths upto 32mm in 6mm Dia. The cut quality is absolutly fantastic and they last age's in Ali, far far longer than any other cutter I've used.! . . . but they are expensive and you pay for the quality.
Basicly I buy the cheap Ebay cutters for general use and the Karnasch for finishing or better jobs.
I haven't tried the single flute eBay ones yet, though I have ordered some. I have tried the 2 flute and 4 flute K2 and the 4 flute X5070. I found 4 flutes gives a better finish than 2 flutes and the shorter flutes of the X5070 give better finish than the longer K2.
It's much more critical S&F are spot on giving correct chip load when using multi flute cutters.! If not they wear quickly due to heat and the finish gets rubbish fast.!!
Shorter cutters will always tend to give a better finish anyway due to less tool flex. I always do a full depth 0.1mm finish pass when machining Ali and wanting decent finish so even the cheap chinese cutters give a good finish.
If chip removal is the key to good finih, then a 2 flute cutter would give a better result than a 4 flute, wouldn't it? It didn't for me.
Those cutters are advertised as:
'For ultra high speed machining of high hardened materials.• Suitable for dry cutting and high speed cutting.'
So they're meant for machining hardened steel without coolant at a high speed ... nothing to do with machining aluminium. The coating only helps when the cutter is operating at a high temperature (which is not the case when cutting aluminium), hence the cutter will actually achieve a higher material removal rate without coolant since it allows the coating to reach the higher temperature where it's properties (hardness etc) change and most of the heat goes into the chips.
Jazz has said it all really - more space for the chips with a single flute and the chips are ejected more readily.
Wait until you've used the 6mm single flute cutters ...
To be honest I find the Alu pow HSS 1 flute give a great finish, better than carbide, but they don't last long enough.
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