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Can anyone tell me what is the correct radius ball end mill to use when making a rivet bucking bar?

I have read that others have used a 1/4" ball end mill. I ordered one, and used it to make a bucking bar out of a steel block. I tried it and got a nasty ring around the head of my rivet. I tried to flair out the radius in the steel block with a handy dandy Dremel tool and a small cylinder stone. I found that I don't have a distinct ring like before, but it still makes a not too sweet looking rivet!

My eyes started to go crossed at 1:00 AM this morning, so I just quit on it until I could ask you experts!

Thanks in advance!

Yours,
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[Stickerman]

Get a 9/32 ball nose end mill for that and you should be fine.

 

[hcpookie]

I just used a hand drill - drill shallow with around 3/32 size, then to 5/16" head. Move the hand drill in all directions at 45-degrees to the surface to enlarge the hole. That's all I've ever done and it has worked well. Could use a dremel too.

 

[Thumb Clip Pull Pin]

Thanks fellas!

I just looked up the price of a four fluted, center cutting 9/32" single ended carbide ball end mill in the MSC catalog! Talk about sticker shock!

I think that I will try hcpookie's method before I order another dag done dust collector that I will never be able to find when I need it again!

Yours,
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[yosuthnmasa]

I just used a hand drill - drill shallow with around 3/32 size, then to 5/16" head. Move the hand drill in all directions at 45-degrees to the surface to enlarge the hole. That's all I've ever done and it has worked well. Could use a dremel too.

Very nice! Wish I would've know how to do this, before spending the money on a ball end mill along with shipping a few months back. I don't know about you guys, but the flutes on mine seemed to have chipped fairly easily!

 

[Stickerman]

Yeah, that 4 flute end mill is kind of pricey. I lost one and had to buy another

We're getting ready to pack all of my equipment up for the move in the next couple of days so I'm putting that end mill somewhere I can find it. Then hopefully the one I lost will show up too.

 

[Thumb Clip Pull Pin]

Chipped flute prevention.

Very nice! Wish I would've know how to do this, before spending the money on a ball end mill along with shipping a few months back. I don't know about you guys, but the flutes on mine seemed to have chipped fairly easily!

Yo massa,

You got to go slow, with both feed and speed. Use plenty of lube, and clear the chips often. Treat them just like a pretty woman!

Yours,
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[Thumb Clip Pull Pin]

The dreaded words! "Pack up and move!"

Yeah, that 4 flute end mill is kind of pricey. I lost one and had to buy another

We're getting ready to pack all of my equipment up for the move in the next couple of days so I'm putting that end mill somewhere I can find it. Then hopefully the one I lost will show up too.

I think that I would loose the rest of my over taxed mind if I had to pack up all of my "treasures" and move again! My wife used to hate for me to go to the dump because I would always bring back what I like to call, "raw materials" (she calls it "junk"!)

Yours,
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[fal_shooter]

Yo massa,

You got to go slow, with both feed and speed. Use plenty of lube, and clear the chips often. Treat them just like a pretty woman!

Yours,
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If you have a problem with your pretty women chipping you might be doing it wrong.

 

[Thumb Clip Pull Pin]

No! Actually I ment for the reader to use plenty of lube, ease the tool in at slow revs, and don't go too deep too fast. I never actually chipped a woman. Pretty or ugly.

Yours,
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