If you can find four flute cutters to fit your collets, you'll find them much more robust than two flute. Or... If the collets will take 6mm shanks, you have a wide choice of three flute disposable carbide cutters that can be run at 7-10,000RPM.
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Thanks. I can only fit 1/8" shank cutters into our machine (Excellon). I did find a company selling a 3/32" cutter with an 1/8" shank suuitable for cutting metal so I might try one of those.
Steve.
I might have some 1/8" shank solid carbide cutters (four flute), if not I can put you in touch with a UK supplier. Ping me in a day or so if I haven't gotten back (doing the night shift tonight).