End mills

[John Rudd]

I finally managed to get round to trying to sharpen some end mills I have....

Having ground the clearances ( primary and secondary ) I need to grind the central clearance.........


How do you guys do yours?


I've seen the centre relieved by grinding across the face forming a X......Some of my cutters have the centre already relieved...like a counterbore....I have nothing that will grind the centre...

[chipenter]

I use worn angle grinder 1mm cutting disks for gashing , that pretty much opens the centre but they won't plunge cut any more , or for Clarkson type a tungsten carbide drill in the lathe at 150 rpm will do it .

[John Rudd]

Jeff,
Thanks for the tips.....esp the tc drill bit.....surprised that will do it...but are we talking solid carbide or something akin to masonry drills?

Plunge cutting not an issue....

[chipenter]

Solid every time I have very short spotting drill 60 degree , have tried reground masonry but they tend to wobble and not enough clearance , tip don't leave the swarf on the ways it's very fine and sharp .