Show off your largest drill bit!

[OccupantRJ]

Sorting drills tonight, so I decided to take a pic of this 2-5/8" runt and start this thread for fun and for your viewing pleasure. Next I gotta find a container to vinegar soak it. Now it's someone else's turn at the largest personally owned drill bit challenge, beginning now.

 

[Rye425]

I think you just threw all the cards out on the table and left no room for any improvement!

That's one big freakin drill bit

 

[alex71]

what sort of personally-owned machine do you have to turn that personally-owned drill?

 

[KCarGuy]

That has got to be the Worlds Smallest Sprite Zero Bottle that I have ever seen!!!

 

[rickey1013]

Thats a mindfreak.

 

[Stephenw]

Sorting drills tonight, so I decided to take a pic of this 2-5/8" runt and start this thread for fun and for your viewing pleasure. Next I gotta find a container to vinegar soak it. Now it's someone else's turn at the largest personally owned drill bit challenge, beginning now.

My biggest is one inch.

Your bit looks like it has a morse taper shank. Post pictures to prove you have a machine that can turn it.

 

[OccupantRJ]

what sort of personally-owned machine do you have to turn that personally-owned drill?

I can adapt it to turn it, but don't think I could do much drilling with it! I've hung onto it for a conversation piece, and used to have it displayed on a bookcase in my shop. It sure makes jaws drop! I've often thought about adapting it to fit a standard pistol grip drill, and just leave it laying around to see what people do who see it.

 

[OccupantRJ]

My biggest is one inch.

Your bit looks like it has a morse taper shank. Post pictures to prove you have a machine that can turn it.

Never said I did, did I?

 

[Alchymist]

Not a drill bit, just a small ball end mill - that's a 6" 4 jaw it's setting next to.

 

[OccupantRJ]

Not a drill bit, just a small ball end mill - that's a 6" 4 jaw it's setting next to.

She's a healthy one, too! You got me beat on the ball end mill.

 

[east_tn_emc]

Here are the two bits I used to drill a hole in my concrete foundation....

 

[A_Pmech]

I haven't tooled up the little radial yet.



Offhand, the largest I can scare up is around 1 1/16" straight shank:

 

[OccupantRJ]

I haven't tooled up the little radial yet.



Offhand, the largest I can scare up is around 1 1/16" straight shank:

I thought about you and the radial when I posted this up.

 

[OccupantRJ]

Here are the two bits I used to drill a hole in my concrete foundation....

How did that drill on the left do for you? What name does it go by? Is it considered a concrete spade drill?

 

[bchee]

How about a 3" spade bit?

 

[east_tn_emc]

How did that drill on the left do for you? What name does it go by? Is it considered a concrete spade drill?

It did very well...long story short, my concrete guy showed up earlier than expected so I did not get conduit in place for electric before concrete was poured. I went ahead and did the block knee-wall and used the drill to go thru about 8-10 inches of fully cured 5000PSI concrete. It took about 20 minutes to go thru.....loud but not too difficult...I kept a waterhose on to keep the bit cool.

It was a 3 1/2" carbide spline bit...that, the 1 1/2" bit and a Dewalt rotary hammer-drill code ~$60 to rent for 24 hours.

 

[OccupantRJ]

How about a 3" spade bit?

Spade, forstner, hole saws, they're all included in the fun show off of big drills, as long as you own it. No pics plucked from the Internet, please.

 

[OccupantRJ]

It did very well...long story short, my concrete guy showed up earlier than expected so I did not get conduit in place for electric before concrete was poured. I went ahead and did the block knee-wall and used the drill to go thru about 8-10 inches of fully cured 5000PSI concrete. It took about 20 minutes to go thru.....loud but not too difficult...I kept a waterhose on to keep the bit cool.

It was a 3 1/2" carbide spline bit...that, the 1 1/2" bit and a Dewalt rotary hammer-drill code ~$60 to rent for 24 hours.

Great. I haven't had the need for one like that yet, but it's always good to know what weaponry is available.

 

[BigMike782]

I don't have any pics of it......cuz I never figured on posting pics of hole making tools but my biggest is the boring head for the Bridgy.

 

[jake00]

6" hole saw.

 

[american lockpicker]

 

[A_Pmech]

Maybe this puts me back in the running...

1-3/4 x 18

 

[327-365hp]

I've been looking for some big drill bits to go with my big taps.

[/IMG]

The bigger one is 3 1/4" The bolt is 2" and takes a 3 1/8" wrench.

 

[Sparkfarmer]

I use this for some landscaping in the backyard when i don't feel like using my shovel.

 

[OccupantRJ]

I've been looking for some big drill bits to go with my big taps.

[/IMG]

The bigger one is 3 1/4" The bolt is 2" and takes a 3 1/8" wrench.

I think you are well on your way to winning the big tap award, that's for sure.

 

[William Payne]

There are some pretty big drill bits at work but I don't think any are bigger then the original posters I will have to look.

 

[theoldwizard1]

No pic, but related. There is a surplus store nearby that sells all sorts of "interesting" stuff (much is Chinese). Kitts is a pretty amazing place. Any tool guy would go nuts in there.

So I picked up a 3/4" drill with a shaft turned down to 1/2". The first time I used it, I was drilling a hole in a stud to run some wires and was smiling about how well it worked when the bit stuck. It flipped the drill around and smashed my wrist into the wall (not using the side assist handle). After checking to see that my wrist was not broken (not the first time with this drill) and backing out the bit, I found that I actually BENT it !

 

[bestatv]

My lord,what did that valve come out of?An ocean liner?

 

[scott37300]

No pic, but related. There is a surplus store nearby that sells all sorts of "interesting" stuff (much is Chinese). Kitts is a pretty amazing place. Any tool guy would go nuts in there.

So I picked up a 3/4" drill with a shaft turned down to 1/2". The first time I used it, I was drilling a hole in a stud to run some wires and was smiling about how well it worked when the bit stuck. It flipped the drill around and smashed my wrist into the wall (not using the side assist handle). After checking to see that my wrist was not broken (not the first time with this drill) and backing out the bit, I found that I actually BENT it !

Similar story about 10 years ago I was an electrician. Roughing in a new house and went to drill the 4" hole out the side of the house to vent the bath fan. Using a hole hawg and a 4" hole saw going through OSB sheathing and it caught. Ripped the drill out of my hands and spun it around and broke my nose. I was standing in the trusses and fell to the floor. Those things have some major torque when they catch! Also had an incident with a 3" hole saw and hole hawg going through 3/8" steel. Just have a small drill press so figured the hole hawg would handle it better. Really need a mag drill before I break another bone!

 

[CAOS]

My lord,what did that valve come out of?An ocean liner?

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I use mine as a paper towel roll holder in the garage!

 

[speed bump]

My avatar is a 8.75" diameter bit, I was looking around today but I couldn't find the 13 5/8" tricone we use for surface. We had a bunch of cute little 6.125" Tricones and full drift bits though.

 

[TozziWelding]

2 3/4"

 

[OccupantRJ]

Maybe this puts me back in the running...

1-3/4 x 18

Looks like it's time for AP to make a small scale black powder cannon........

 

[OccupantRJ]

No pic, but related. There is a surplus store nearby that sells all sorts of "interesting" stuff (much is Chinese). Kitts is a pretty amazing place. Any tool guy would go nuts in there.

So I picked up a 3/4" drill with a shaft turned down to 1/2". The first time I used it, I was drilling a hole in a stud to run some wires and was smiling about how well it worked when the bit stuck. It flipped the drill around and smashed my wrist into the wall (not using the side assist handle). After checking to see that my wrist was not broken (not the first time with this drill) and backing out the bit, I found that I actually BENT it !

I have seen a few good quality drills bent that way. There's a lot of force applied when a drill hangs up and can flip the operator around. I don't usually drill wood with a twist drill without grinding the end to a brad point configuration. This will make some really nice, clean holes in wood when used in a drill press, and helps prevent the hangup you refer to.

 

[OccupantRJ]

2 3/4"

Looks like Tozzi has upped the ante!

 

[Sterff]

If you have ever used a core drill you will see some big bits. I have used a 24" bit before.

 

[danski0224]

A real core drilling rig uses hydraulics

And yes, the coring outfits can have very large and expensive coring bits.

 

[cnc-me]

No pic, but related. There is a surplus store nearby that sells all sorts of "interesting" stuff (much is Chinese). Kitts is a pretty amazing place. Any tool guy would go nuts in there.

Used to buy a lot of tools from Kitts.
A lot of my sockets are SK bought from Kitts.
Even got a Brut sandblaster from them.
They used to have some of the best deals on air tools too, these were
in the days before the internet.

 

[cnc-me]

If you have ever used a core drill you will see some big bits. I have used a 24" bit before.

That sure is cute, never seen one with a vacuum pump on it before.

 

[327-365hp]

2 3/4"

Hey, that's not going to fit in my Drill Doctor