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Gun Drilling Fail

Rogue_Machinist

Hot Rolled
Joined
Jul 26, 2011
Location
Oregon, USA
So I messed up really bad. Lol. I did my math incorrectly. Instead of figuring .0002"/rev @2000rpm.

I did .0012"/rev @2000rpm. Well needless to say.....$100 gun drill
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I had the sweetest 1.25" Devibe boring bar. I forgot to move it outta the way of the way when I went to the front turret. The chuck jaws survived. LOL.
 
At least it's only a $100 drill. What about a $250 body plus a $90 insert?

Ya, drills don't like to be treated like punches....... :D
 
Not even that bad. Bobw has some pretty ugly pictures. DMF TomB has a picture of a 25" long 1/2" Drill sticking out of the controls monitor. Just don't ask Marcus for pictures of his fuck ups--like jewelry to normal folks.

R
 
The point is still somewhat visible....
It's not like a 5xD drill body melted back to 1xD.....been there done that.
 
The point is still somewhat visible....
It's not like a 5xD drill body melted back to 1xD.....been there done that.
Yeah i started it slow. First time gun drilling. And gradually stepped up. My boss was there. And he heard it twist. He laughed said "oops".

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I read the title and thought "Crap, isn't that the guy I gave gun drilling pointers to? Hope this isn't my fault" :D

Glad it wasn't worse. Hope you ordered at least 5 drills!
 
I read the title and thought "Crap, isn't that the guy I gave gun drilling pointers to? Hope this isn't my fault" :D

Glad it wasn't worse. Hope you ordered at least 5 drills!
Well the manufacturer calls out 4966rpm 2.5IPM so roughly .0005"/rev.

My 12" Chuck has a max rpm of 3300rpm. But thr machine claims 3000rpm max. I tried 3000rpm and felt like the machine was ready to lift off.

So i calculated for 2000rpm and i totally mathed incorrectly and for some reason I got .0012"/rev. Lol. Should have been .0002"/rev

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Successful gun drilling today. 2500RPM @.003"/rev

Beautiful finish and makes beautiful chips.
My boss even stated im the first guy in the shops history to gun drill.

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