Milling a half circle

[Aaron012696]

What tool would you use to mill a half circle like the one shown in the picture?

 

[706jim]

Corner rounding cutter. Don't know if there would be enough clearance for the job you've shown though.

 

[mhajicek]

In production, as said, a corner rounder, if there's room. Lacking room, or in a small batch, I'd surface it with a ball endmill.

 

[sfriedberg]

Another production option would be a custom tool. Could be as simple as a flycutter ground to a radius, set to cut on the inside instead of the outside, cutter made from tool steel flat, dumb slotted round with setscrews as the tool holder. Could be deluxe like a Severance external deburr tool, but with a radius rather than a chamfer. Both of these would require minimal clearance from the other features on the part.

 

[Radar987]

What tool would you use to mill a half circle like the one shown in the picture?

Really?

A "circle"?

 

[CarbideBob]

Hollow mill or hollow cutter even if only one or two flute?

 

[plastikdreams]

3 electrodes on a sinker edm, rough, semi finish, finish.

 

[kustomizer]

It would be an interesting challenge in a turning center, how many are we making and what is the material?

 

[Cole2534]

I'd forge it.

Whether that means a large press or counterfeiting remains to be seen.

Programmed via Mazatrol

 

[Ianagos]

Just get the part 3d printed. It’s the technology of the future you know

 

[mhajicek]

Another production option would be a custom tool. Could be as simple as a flycutter ground to a radius, set to cut on the inside instead of the outside, cutter made from tool steel flat, dumb slotted round with setscrews as the tool holder. Could be deluxe like a Severance external deburr tool, but with a radius rather than a chamfer. Both of these would require minimal clearance from the other features on the part.

Good point. In high production, a custom ground annular cutter would do it on one drill cycle per feature.

 

[G00 Proto]

Dang it, I saw a guy making hemispheres using an annular cutter while rotating the part on a 5-axis. It was slicker than snot. I was going to go back and figure it out… but I got sidetracked. Now it’s just a hazy memory.


Sent from my iPhone using Tapatalk

 

[beege]

Depending on scale and material, it should be do-able with a corner rounding end mill.

But it made me recall a job I did 25 years ago. I called the tool a trepan, but I guess it was a three flute annular cutter. Spherical part was .110" in diameter.

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