Countersinks- Single flute/Zero Flute....?

[EmilioG]

I own and have used a variety of countersinks, most are Keo and Melin. Single flute, multi flute, zero flute, cobalt, HSS, etc..in 82 and 90°, which is what I use most often. Size range from 1/8"-7/8".
Using slow speeds, I get the best results but sometimes I get some chatter which results in munged up countersink op.

What are you gentlemen using that gives the best results? in steel and non ferrous materials. I use mostly tool steel, mild steel (1018 1041), aluminum, bronze, copper and brass. what works best with what? I try to countersink right after I drill a hole to keep things lined up.

 

[4GSR]

Single flute and the Weldon zero flute ones is what I prefer. Multi-flute C'Sinks have the tendency to chatter regardless what you try to do to remedy the chatter. Generally have to run very slow to keep the chatter out.

 

[David S]

May I ride on this thread and ask if anyone can identify this type of countersink? I have searched all over and have no idea what they are called.



David

 

[mikey]

I use Keo and Weldon zero flute countersinks exclusively to chamfer holes and countersink for screw heads. I prefer single flute countersinks from MA Ford to create accurate tapered sockets.

 

[EmilioG]

Are the zero flute CS's easy to sharpen? How?

 

[Rustrp]

Are the zero flute CS's easy to sharpen? How?

Send them out to have them sharpened at about 1/3rd the cost of new. The same with the single flute M A Ford, Severance CS tools.

 

[Rustrp]

May I ride on this thread and ask if anyone can identify this type of countersink? I have searched all over and have no idea what they are called.

View attachment 232548 View attachment 232549

David

It's a single flute CS design for an insert.

 

[EmilioG]

Why is Weldon CS so popular? Is it the range that they can CS? I have not seen another CS brand that has this range.

 

[Bob Korves]

Countersinks need to be fed at higher rates than many of us are willing to try. The tool needs to be cutting real chips, not powder. Slow speed + fairly heavy feed = success! Slow feed = dull cutter...

 

[4GSR]

Are the zero flute CS's easy to sharpen? How?

If you're a DIY like me, Weldon used to make a sharpening fixture that was an accessory for your T & C grinder. I have one I picked up several years ago and have not used it to this day. Like Rustrp said, "send them out for sharpening".

EDIT- The fixture has a one lobe cam that is used in the sharpening process. And depending on the diameter of the countersink, you have different height lobes to choose from. There is a little hit and miss using this this of sharpening fixture, too.