Quote Originally Posted by Karl View Post
So do these single flute carbide cutters on ebay have a centre cut for plunging?
the cut passes the centre and because of the rake and clearence etc if you plunge a blind hole you end up with a small dome at its base

make sure you measure the radius of your cutter when you buy them !!!!
mine sold as 3.175mm however the cutter was much closer to 3mm and the shaft was 3.175mm..... took me ages to work out why some of my parts were under/over sized:whistling: