Drill Bits breaking

[55fairlane]

Hmmm. Machinists at my day job call them drill bits. Then other things.

Of course, I sometimes struggle to get more than “I need a drill bit” out of them

I checked 3 different machinist & tool maker books I own. No mention of drill bits, small sample from this particular book.

 

[Squirt239]

I checked 3 different machinist & tool maker books I own. No mention of drill bits, small sample from this particular book. View attachment 257543 View attachment 257544 View attachment 257545 View attachment 257546 View attachment 257547

This reminds me of the clip vs magazine conundrum

 

[DoggyDaddy]

Question for @55fairlane ... What do you call this?

I'll give you a hint Wheel of Fortune style... __race and __it

 

[Jaybird1980]

Question for @55fairlane ... What do you call this?

I'll give you a hint Wheel of Fortune style... __race and __it


View attachment 257591

Pain in the A** is what I call them

 

[ditcherman]

Question for @55fairlane ... What do you call this?

I'll give you a hint Wheel of Fortune style... __race and __it


View attachment 257591

The first cordless drill?

 

[DoggyDaddy]

Pain in the Ass is what I call them

I have one and like it! The hole into which my drive through gate's drop rod falls sometimes gets clogged with dirt and debris, and it's perfect for clearing it.

 

[DoggyDaddy]

The first cordless drill?

No. According to 55fairlane, all "drills" are cordless since they're just pieces of metal designed to poke holes in things.

 

[Jaybird1980]

No. According to 55fairlane, all "drills" are cordless since they're just pieces of metal designed to poke holes in things.

I know the first time I worked with someone from overseas he asked me for a drill and I handed him my cordless. He was confused, then I was confused. We got it sorted out though.

He called them drills and drill machines.

 

[DoggyDaddy]

I know the first time I worked with someone from overseas he asked me for a drill and I handed him my cordless. He was confused, then I was confused. We got it sorted out though.

He called them drills and drill machines.

Maybe 55fairlane is from overseas. Kidding aside, he is the only one I've seen referring to them as "drills" as opposed to "drill bits" in my 63 years on this earth. Obviously he posted some evidence that they were indeed referred to as such back in the olden days.

 

[Jaybird1980]

Maybe 55fairlane is from overseas. Kidding aside, he is the only one I've seen referring to them as "drills" as opposed to "drill bits" in my 63 years on this earth. Obviously he posted some evidence that they were indeed referred to as such back in the olden days.

They're still referred to as drills by some people in the trades, especially during training or literature. I had never heard it until I was 18 or so on the job.

Kind of like Bolts and Screws. In some a bolt is a screw until it has a nut, but with most a screw is tapered and bolts are not.

 

[DoggyDaddy]

Kind of like Bolts and Screws. In some a bolt is a screw until it has a nut, but with most a screw is tapered and bolts are not.

Machine screws have a nut. Sometimes a nut just means the screw is over...

 

[Jaybird1980]

Machine screws have a nut. Sometimes a nut just means the screw is over...

A machine screw is a bolt in a lot of literature

 

[DoggyDaddy]

A machine screw is a bolt in a lot of literature

And sometimes you have to bolt in the middle of a screw...

 

[55fairlane]

Question for @55fairlane ... What do you call this?

I'll give you a hint Wheel of Fortune style... __race and __it


View attachment 257591

An idiot tool? Cause only an idiot wants to drill holes with this tool....

 

[55fairlane]

I know the first time I worked with someone from overseas he asked me for a drill and I handed him my cordless. He was confused, then I was confused. We got it sorted out though.

He called them drills and drill machines.

A drill motor is the habd held item used to power a drill. To be more technical there are, cordless drill motor, an air powered drill motor, a drill press ......and radial arm drill press, like the one in this picture

 

[55fairlane]

No. According to 55fairlane, all "drills" are cordless since they're just pieces of metal designed to poke holes in things.

Drills make cylindrical shapes voids in metal
Reamers take the "hole" to size
Counter bores add an additional cylindrical shaped void , true to the axis line of the "hole"

 

[Flingarrows]

A drill motor is the habd held item used to power a drill. To be more technical there are, cordless drill motor, an air powered drill motor, a drill press ......and radial arm drill press, like the one in this picture View attachment 257651

In my younger days in the trades I worked with some old timers (and great workers) who would refer to the mechanical object that twists the drill [bit], as a “drill motor”. I don’t recall what they called the drills.

 

[D K]

And the older electricians I’ve worked with called them “drill motors”, too.
Unless it was cordless - those were “battery drills”. Drove me bonkers, but it sounds like there was some validity to their terminology!

 

[55fairlane]

Double Margin drills have an additional margin ground behind the leading margin,providing twice the number of contact points.The second margin performs various functions to improve hole quality.

• The trailing margin burnishes the cavity, making a true hole and smoother finish, helping to provide a more concentric drilled hole
• 
  
• A reamer finish can be achieved with double margin drills, eliminating a second operation.
• 
  
• When a double margin drill is used with a drill bushing, the four margins locate in the bushing, providing increased bushing support in excess of 200%.
• 
  
• When intermittent cutting is required, the double margin drill performs in two ways: Enhanced margin support in the first cavity cut, and support on breakthrough, which stops the drill from wandering when in contact with the work space.
• 
  
• Drill back taper is more tightly controlled than a regular drill, enhancing a rounder hole location.
• 
  
• 135-degree split point provides immediate self-centering on contact with the work piece, and reduces thrust, due to its notch-type web thinning at the chisel edge length. The split point is excellent for drilling harder materials (titanium, stainless steel, and high temperature alloys.)
• 
  
• Will all these features incorporated in this double margin drill, it is excellent for hand drilling.

 

[Milo]

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