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Plunge cutting boring bar (Oopsie!!)

Finegrain

Diamond
Joined
Sep 6, 2007
Location
Seattle, Washington
Question: How far can a 1-1/4" boring bar make it into a 3" OD 6061 blank that doesn't have a drilled hole?
Answer: Surprisingly far!

Boring bar plunge cut.jpg

These blanks have a 1.69" hole drilled in one end, and the boring bar is supposed to finish the bore to 1.753". Get distracted, put the blank in the wrong way, hit the button, start to walk away just like you did a hundred times before, and you hear that funny groaning, chomping noise :eek:.

The machine didn't even stall out or overload the servo. Boring bar was fine other than being pushed back in its holder a little. Replace the insert, reset the offsets, and good to go.

Regards.

Mike
 
You just need to grind a single flute on the boring bar opposite the insert. Then you skip the drill altogether!
 
Question: How far can a 1-1/4" boring bar make it into a 3" OD 6061 blank that doesn't have a drilled hole?
Answer: Surprisingly far!

View attachment 299822

These blanks have a 1.69" hole drilled in one end, and the boring bar is supposed to finish the bore to 1.753". Get distracted, put the blank in the wrong way, hit the button, start to walk away just like you did a hundred times before, and you hear that funny groaning, chomping noise :eek:.

The machine didn't even stall out or overload the servo. Boring bar was fine other than being pushed back in its holder a little. Replace the insert, reset the offsets, and good to go.

Regards.

Mike

This time saving technique actually works pretty well on plastic parts with a micro 100 boring bar :D
 
Question: How far can a 1-1/4" boring bar make it into a 3" OD 6061 blank that doesn't have a drilled hole?
Answer: Surprisingly far!

View attachment 299822

These blanks have a 1.69" hole drilled in one end, and the boring bar is supposed to finish the bore to 1.753". Get distracted, put the blank in the wrong way, hit the button, start to walk away just like you did a hundred times before, and you hear that funny groaning, chomping noise :eek:.

The machine didn't even stall out or overload the servo. Boring bar was fine other than being pushed back in its holder a little. Replace the insert, reset the offsets, and good to go.

Regards.

Mike

LOL!

Did NOT stall? Itty-bitty inch & a quatah?

Machine has the balls you could be wasting an op with those pilot holes?

See "balanced" boring-bar, Gun drill. Spade drill. Insert drill. "etc."

Lotta stuff needeth no "pilot hole" Not just an Iowa-class Mark 7 16"-50 super-heavy projectile.

:D
 








 
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