Ever break a bit

D

Dixieblade57

Joined
Jun 20, 2007
Messages
1,361
Have you ever broke a drill bit off flush in what you were drilling, I did today when I was drilling a pilot hole for the bearing mount plate for my KMG clone today.
Now the problem was I had a 1/8"bit (of Lowe’s quality) carbide bit broke off in the 3/4" plate and it had not drilled thru where I might have a chance of driving it out. After nearly two hours of nothing working I chucked up one of these 1/4" bits

http://www.mcmaster.com/#solid-carbide-drills/=43s80q (scew 1/2 way down the page to the straight flut drill bits and click of that)

and to my surprise, with the assistance of some cutting fluid it eat up the first bit. Now I will say I was putting the pressure to it. But I was surprised how well it eat thru that other bit. It saved my buns.
I think it was either Phill or Nick that origionally turned me on to these bits. They are kind of expensive and they will break and you can ruin the cuttting edge but, when you have to cut someting hard these are the trick!! :thumbup:
 
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you can pour some ferric chlouride in the hole and leave it overnight,that will loosen it up enough to get it out sometimes.
 
caseynz said:
you can pour some ferric chlouride in the hole and leave it overnight,that will loosen it up enough to get it out sometimes.
Click to expand...

Only on Ti my friend, only on Ti (and a couple other exotic alloy's) ;).
If you were to do that with mild steel you would be very disappointed come morning :eek:

FWIW, a good trick for getting broken centerdrills, standard drills etc. out is by simply using your scriber and an air gun set-up with a small tip that will concentrate the blast. Most of the times there is some wiggle in the broken bit. By concentrating the air blast in the hole and picking with your scriber, 99% of the time it will come flying right out........... but not likely when you're 6" deep into a part. ;)


:)
 
yeah i tried drilling from the other side hoping to push it out, but that didn't work, then tried beating it out, finally gave up after a couple of hours. my boss worked at it for a week, trying you break its out with a smaller drill. ended up walking the drill bit and drilling out the side of the part lol, fun times
 
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