First off we dont grind any of our endmills but do alot of hand grinding on carbide and HSS. We tried to use OSG endmills (HSS and Cobalt) finish endmills for last couple years and they squeek like hell and chatter like mad. Tried everything ..toolholders, checked retention, runout. I have a microscope here maybe I will post up the flutes and angles. The OEM grind is horrendously bad on or am I going nuts here? They chatter in steel, aluminum you just cannot get any kind of SFM out of these in any material. Anyone else have this issue with OSG?
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