Deep Boring

[thestelster]

I had to bore out a piece of AL6061 to 0.740". Used a 5/8" carbide boring bar. 6" depth, that's 9.6:1 ratio. No chatter, 670rpm@0.005ipr. It was a pretty tight fit! Finish isn't great, but doesn't need to be on this project.

 

[Susquatch]

I had to bore out a piece of AL6061 to 0.740". Used a 5/8" carbide boring bar. 6" depth, that's 9.6:1 ratio. No chatter, 670rpm@0.005ipr. It was a pretty tight fit! Finish isn't great, but doesn't need to be on this project.

Boy, that's a tight fit! Nice job!

For some reason my pants don't fit right whenever I do stuff like that.

Guessing some of the finish observation was the result of swarf bunching up behind the bar.

Is the boring bar carbide or just the insert?

 

[thestelster]

Boy, that's a tight fit! Nice job!

For some reason my pants don't fit right whenever I do stuff like that.

Guessing some of the finish observation was the result of swarf bunching up behind the bar.

Is the boring bar carbide or just the insert?

It's a carbide shank with coolant hole. I blow compressed air through the hole to clear the chips.

 

[Brent H]

Nice work!!

 

[Susquatch]

It's a carbide shank with coolant hole. I blow compressed air through the hole to clear the chips.

Ah, I see! Very cool! Does the air blowing through the shank act like a venturi to pull extra air through the tube too? Or does it just go everywhere?

 

[Proxule]

Try dcgt or ccgt inserts, sharper and allows for shallower DOC.
They're intended for aluminum but do nice in steel as well
gluck

 

[thestelster]

Try dcgt or ccgt inserts, sharper and allows for shallower DOC.
They're intended for aluminum but do nice in steel as well
gluck

I've never tried those inserts. I'll have to give them a go. But how long do they last on steel?