I ruined a drill today. I'm embarrassed.

Mark Rand · Mar 19, 2020

I was just bashing a 1/2" hole through a bit of 1/8" plate on the mill, prior to welding it onto a bit of 1/2" stainless bar. 600rpm and 1.5thou/rev. OK, it was 316 stainless. It turns out that friction drilling is a thing, even with a 2hp mill. I now have a MT1 HSS drill with a taper on the flutes and a bit of 316 plate with a super-hard hole in it.

I really do need to pay attention to what the material is when I'm using something other than carbon steel or aluminium. :confused:

gbent · Mar 19, 2020

Welcome to the club.

eKretz · Mar 19, 2020

Ouch. Time to get the carbide drill out.

Limy Sami · Mar 19, 2020

Reassuring to know one is not alone

PSSST, Blame it on your age - works for me

John Garner · Mar 19, 2020

Let's see if I can keep a straight face while typing this . . . You SHOULD be embarrassed, NONE of the rest of us have EVER done such a thing.

Nope, I couldn't.

Cole2534 · Mar 19, 2020

Big holes in thin stainless sheet always sucks.

To be clear- when I say I big, I mean that the drill diameter is 4x the material thickness.

MrWhoopee · Mar 19, 2020

I was nodding my head, yes, good, until I read 316! [Sound of screeching brakes]
We all have lapses, they are the lessons that stick.

Big B · Mar 19, 2020

As long as you don't do it again right away we'll let it slide this time.

Limy Sami · Mar 19, 2020

Big B said:
As long as you don't do it again right away we'll let it slide this time.

And who's after the foreman's job?

13engines · Mar 19, 2020

Hmmm... paying attention or not, I can't think of any material I'd run a 1/2 Drill in at 1.5 thou per rev. Sorry but no sympathy here... you had it coming. :-)

But would you like to see my collection of broken off and busted up drills and end mills? I think I'm up to about a medium flat rate box full by now. Just added a 1/4-20 tap yesterday that tried to tap where there wasn't a hole. What do they say? "That'll leave a mark!"

Mark Rand · Mar 19, 2020

Yes, 6 thou/rev might have saved the drill, but wasn't thinking after the last time I used the quill feed.

If it gets remembered, it'll be a cheap lesson!

eaglemike · Mar 19, 2020

13engines said:
Hmmm... paying attention or not, I can't think of any material I'd run a 1/2 Drill in at 1.5 thou per rev. Sorry but no sympathy here... you had it coming. :-)

But would you like to see my collection of broken off and busted up drills and end mills? I think I'm up to about a medium flat rate box full by now. Just added a 1/4-20 tap yesterday that tried to tap where there wasn't a hole. What do they say? "That'll leave a mark!"

You must be a youngster. Or else you just don't make mistakes. :bowdown:

13engines · Mar 19, 2020

Ha-ha... Let's just say I saw the Beatles the first time they were on Ed Sullivan. And they give me discounts at the movies without even asking. Can't beat it.

I thought a medium flat rate box full sounded like a lot of eff-ups.

Frank.H · Mar 19, 2020

1/2" drills are cheap, 1/8" 316 is cheap unless you have the largest bridge mill in the world. Get back to work bruh, you spent more money posting than just fixing your mistake.

L Vanice · Mar 19, 2020

Cole2534 said:
Big holes in thin stainless sheet always sucks.

But step drills (Unibit type) take away lots of the pain, if you keep the speed appropriate.

https://www.irwin.com/tools/browse/drill-bits/unibit-step-drills

Larry

cyanidekid · Mar 19, 2020

Cole2534 said:
Big holes in thin stainless sheet always sucks.

Haha! 1/2” is a big hole? I’ll second Larry and say step drill for that in I/8, or just to be super annoying, put it on the laser! Why would you use power feed for that??? I’d think more like 175 rpm for SS too.. start it with 3/16 with a cordless, then stepdrill. Slooww.. ( that said, I just destroyed about ( 4 )5/16 twist drills in stainless myself going about 800..)

Cole2534 · Mar 19, 2020

cyanidekid said:
Haha! 1/2” is a big hole? I’ll second Larry and say step drill for that in I/8, or just to be super annoying, put it on the laser! Why would you use power feed for that??? I’d think more like 175 rpm for SS too.. start it with 3/16 with a cordless, then stepdrill. Slooww

In the grand scheme? No. But, it is 4x the material thickness and a basic twist drill doesn't like that in mild. Toss in 13 or whatever percent chrome and your day doesn't get any brighter.

cyanidekid · Mar 19, 2020

Haha, yes, see my edit.. :sulk:

memphisjed · Mar 19, 2020

just one bit? a twist bit at that... I would be embarrassed as cutting a piece of stock wrong, which I have never done so not sure how embarrassed that is.

Cole2534 · Mar 19, 2020

memphisjed said:
just one bit? a twist bit at that... I would be embarrassed as cutting a piece of stock wrong, which I have never done so not sure how embarrassed that is.

Me neither. Nor have I used an ER16 collet nut to face an aluminum bar by mistake.

I ruined a drill today. I'm embarrassed.

Diamond

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Diamond; Mod Squad

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Hot Rolled

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Stainless

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Aluminum

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