Single flute carbide cutters

[blackburn mark]

0.5mm depth of cut

that doesnt sound like you jonathan !!

in acetal (like butter to cut) ill go up to 3mm depth with the 3.175mm cutter at 200mm feed and adjust spindle speed untill the chips are nice chunky curl and do a 0.5mm finish at full depth (upto 20mm)
i use a fish tank type air pump to blow the chips away... its a tiny amount of air but with the nature of acetal chips it doesnt take much to clear them even in a slot

they are quite good in abs as well, with the reports i had heard i was exspecting meling problems but i didnt get any of that, im guessing my spindle speed was aprox 2000rpm

iv snapped a couple of small single flute cutters in plastic when braking out of slots that arent perpendicular to the exit face, when the cutter exits the material it can pull itself out of the exit and try to walk around the corner .... pi**es me right off when its a fresh cutter, im guessing a lower feed or higher spindle speed would stop this but it seems to happen at what i would cosider the sweet spot (i might be overly aggressive:whistling:)