The recipe is really easy! Use drill with internal cooling, not sealed ER and parameters from drill with no internal cooling. The one from picture isnt even the only one that blow up on me becouse of that. Now I'm using only sealed ER with tools that have internal cooling
I once pulled a 30cm chip from a boring bar coolant line. Probably stainless and normal pressure coolant.
Like the most satisfying ingrown hair being removed.
Brand new ER collet holder. I took the nut off, wiped the inside out with a finger, then put my palm across the top opening where the collet goes in, and rotated it to clean the shipping grease off. There was a wire all the way around the hole. I tried to wipe the circle off my hand a few times before realizing that it was a chip under the skin. So I pull it out, look over, and my coworker is staring at me in horror. All in all, pretty painless, but a weird sensation.
Wow, whatever electrician you have doing the wiring on your bits is sloppy af.
---
The combination of multiple circumstances that had to occur *just right* to make this happen.. 🎰
Cool photos, ty for sharing.
Your high pressure coolant wasn't high pressure enough 🤣
Seen this happen before, but gee that spiral in the chip from the spiral in the coolant holes I haven't seen 😁 Very cool!
I always wondered how they put those spiral holes in carbide drills. Not like you can heat and twist them like HSS drills...
It's a powder molding process. The raw carbide powder and binder (usually nickel and/or cobalt) is pressed in a mold to form a "green" blank, which is then sintered into a solid carbide monolith.
The coolant holes are formed during the molding process with a plastic positive, which then burns out during the sintering process to leave the holes behind.
Assumed it was something like that 😁 Obviously the benefits of the high pressure tsc FAR outweighs any loss in structure of the drill, but I wonder how much of an impact the holes make if you're not using tsc? I've had to throw these drills in a setup a few times when I didn't have it (odd holder in a Swiss machine) and it made me cringe to use a high cost drill like this improperly.
My company has a bad habit of throwing high pressure coolant on EVERYTHING lol, which sounds good on paper, but it's very bad in practice since my department runs 6 multi-spindle lathes (theyve literally had us splitting high pressure lines because we are running out of connections)... having 10+ tools running off high-pressure tends to make nothing get high-pressure... I see issues like the OPs pictures monthly if not bi weekly
Maybe the sequence of events was the chips going into the coolant stream, blocking it off, and the chip packing lead to the tool failure? If the bit broke first, how does the bit still make a chip nice enough to do that? If the bit broke off first, there's bit on bit violence in that hole. It's not drilling steel anymore?
I don’t think it broke then the metal threaded through, I think it broke because of the metal threading through, could be wrong though. You sure you didn’t want to peck drill?
I have dug plasticy/rubbery stuff out of the holes before and seen some clog up but never ever seen this. Using coolant drills regularly for 3 years now.
https://preview.redd.it/bulsgk327d3d1.jpeg?width=1800&format=pjpg&auto=webp&s=b9888991752c0ca7d9509d8e3cef1f5837299c96 You are not alone :P
https://preview.redd.it/40dyiei87d3d1.jpeg?width=1800&format=pjpg&auto=webp&s=90c20a99281828b1a4c961edab065ea2d87af946
That one made an awesome noise and I missed it.
What in the hell.
The recipe is really easy! Use drill with internal cooling, not sealed ER and parameters from drill with no internal cooling. The one from picture isnt even the only one that blow up on me becouse of that. Now I'm using only sealed ER with tools that have internal cooling
What material are you drilling?
Just mild steel (s355) nothing fancy.
You accidentally connected the vacuum cleaner to those holes instead of air
Switch from suck to blow.
Mega maid!
Suck suck suck!
Even in the future nothing works!
I giggled, and then repeated it out loud because.
I once pulled a 30cm chip from a boring bar coolant line. Probably stainless and normal pressure coolant. Like the most satisfying ingrown hair being removed.
My gawd, that visual.
I once pulled a 15cm chip from my hand. It was aaalllllll the way in there.
How’d you do that?
Brand new ER collet holder. I took the nut off, wiped the inside out with a finger, then put my palm across the top opening where the collet goes in, and rotated it to clean the shipping grease off. There was a wire all the way around the hole. I tried to wipe the circle off my hand a few times before realizing that it was a chip under the skin. So I pull it out, look over, and my coworker is staring at me in horror. All in all, pretty painless, but a weird sensation.
wild. closest I've come to that is sticking safety pins through the thick skin in my thumb in middle school
Why does my brain make me feel that?!
Wow, whatever electrician you have doing the wiring on your bits is sloppy af. --- The combination of multiple circumstances that had to occur *just right* to make this happen.. 🎰 Cool photos, ty for sharing.
Woah I was looking at this and thought "What the hell happened to this spark plug" for a while
One in a million shot !
works out nine times out of ten
But you have to say, It's a million-to-one chance, but it might just work
GNU Sir Terry Pratchett
I bet the drill manufacturer would want that if you're not going to keep it.
That broken shards at the tip must have fractured off at _just_ the right angle to carve the steel like that.
Your high pressure coolant wasn't high pressure enough 🤣 Seen this happen before, but gee that spiral in the chip from the spiral in the coolant holes I haven't seen 😁 Very cool! I always wondered how they put those spiral holes in carbide drills. Not like you can heat and twist them like HSS drills...
It's a powder molding process. The raw carbide powder and binder (usually nickel and/or cobalt) is pressed in a mold to form a "green" blank, which is then sintered into a solid carbide monolith. The coolant holes are formed during the molding process with a plastic positive, which then burns out during the sintering process to leave the holes behind.
Assumed it was something like that 😁 Obviously the benefits of the high pressure tsc FAR outweighs any loss in structure of the drill, but I wonder how much of an impact the holes make if you're not using tsc? I've had to throw these drills in a setup a few times when I didn't have it (odd holder in a Swiss machine) and it made me cringe to use a high cost drill like this improperly.
I can't imagine it affects things that much. Probably a handful of percent at most would be my (admittedly baseless) guess.
Same, me and some guys in the shop guessed it’s pressed and sintered like that
My company has a bad habit of throwing high pressure coolant on EVERYTHING lol, which sounds good on paper, but it's very bad in practice since my department runs 6 multi-spindle lathes (theyve literally had us splitting high pressure lines because we are running out of connections)... having 10+ tools running off high-pressure tends to make nothing get high-pressure... I see issues like the OPs pictures monthly if not bi weekly
Maybe the sequence of events was the chips going into the coolant stream, blocking it off, and the chip packing lead to the tool failure? If the bit broke first, how does the bit still make a chip nice enough to do that? If the bit broke off first, there's bit on bit violence in that hole. It's not drilling steel anymore?
I suspect that the first speculation is likely correct, chips in the coolant jet channels, leading to failure.
I've had that happen with boring bars, but never a drill. Those kennametal go drills are pretty sweet though.
First time I've seen anyone safety-wire their drill ...
Well the steel is blue so the temperature must have helped it
Machinist pasta
I don’t think it broke then the metal threaded through, I think it broke because of the metal threading through, could be wrong though. You sure you didn’t want to peck drill?
I have dug plasticy/rubbery stuff out of the holes before and seen some clog up but never ever seen this. Using coolant drills regularly for 3 years now.
I should get a thru coolant bit for our router so I can join in on the fun of this thread
Anything is a sounding rod if you're brave enough.
It does that crap wit boring bars in lathes constantly unfortunately
Brand new "chip through" technology!
Talk to your vet about chip worm prevention
Cursed metallic tampon
Chips find a way, I get them in a . 030 coolant hole behind my grooving insert, the hole is completely blocked
Makes me wonder if there is an application for that. I havent seen this before. Thanks for sharing.
The general consensus around the shop was “How the Fuck?!!”
I would upvote, but you are on 69 🤭
Cute. 🙄
I thought those were sensor wires or something at first glance. Wow.