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Funny Fluted Drill Bit

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azshadeguy

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#1
Funny Fluted Drill Bit
I hope the pictures come out so you can see the flutes. IMG_2051.JPG IMG_2051.JPG IMG_2050.JPG IMG_2049.JPG
Is this a special drill bit or a fluke? IMG_2049.JPG IMG_2050.JPG It looks like it's bent but it is straight.
The only markings are /64
 

T Bredehoft

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#2
That had to be made on purpose, I wonder what the purpose was...
 

Tony Wells

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#3
I've seen similar drills. My guess is that they are improperly heat treated and get twisted while in a bind. At the cutting end, it appears to have a LH twist, but other parts have a RH twist. And there is the sort of no-twist area of transition. I can't think of a valid reason to make a drill with that configuration intentionally.
 

Cadillac

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#4
It looks like it’s twist was unraveled. If you roll it it’s straight? In the fifth or sixth picture it sure looks like it’s got a droop.
 

Cadillac

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#5
You beat me to it Tony.
 

Tony Wells

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#6
Not by much, Caddy. ;)
 

BtoVin83

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#7
i have seen that happen, telephone installer drilling a hole through the wall. Drill bit wound up with insulation and the drill motor unwound the bit. Staid pretty straight too.
 

FLguy

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#8
Drill bit to drill Maple trees for sap?
 

azshadeguy

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#9
It looks like it’s twist was unraveled. If you roll it it’s straight? In the fifth or sixth picture it sure looks like it’s got a droop.
It rolls across the table pretty smooth
 

Holescreek

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#10
I have one similar somewhere in the shop. I haven't seen it in a few years.
 

Superburban

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#12
Simple, its for a reciprocating drill. :):)

There is router bits like that for wood. So both sides of the bit cut each side of the wood inwards, so there is little splintering of the edge. Called a compression bit.

compression-bit.jpg
 

Scruffy

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#13
Really ,never seen or heard of such of a bit like that.
Ron in ohio
 

ELHEAD

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#14
Looks identical to a couple of H F brand bits after first use.
Dave
 

killswitch505

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#15
I’m going with it’s a shaft from a yankie screwdriver that someone fashioned into prison shank but I have a really active imagination
 

Dredb

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#16
It's a rubbish drill bit, they used to be sold in supermarkets over here, you could bend them with your bare hands.
 

brino

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#17
There is router bits like that for wood. So both sides of the bit cut each side of the wood inwards, so there is little splintering of the edge. Called a compression bit.
@Superburban Thanks!
I had never seen those up-cut/down-cut router bits before, you taught me something new.

Here's a couple references:
What the heck is a compression router bit?
Compression Spiral and Spiral Solid Carbide Router Bits

Apparently often used for CNC routers in MDF and plywood to reduce splintering and tear-out on BOTH faces.

Although they do not look like the pictures from the start of this thread.......those just look like poorly made drill bits that got jammed and then "rearranged" themselves.....

-brino
 

RJSakowski

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#18
Soft steel. I have had cheap drill bits intended for drilling wood unwind in the past. A properly tempered HSS bit will break before it unwinds.
 

whitmore

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#19
Funny Fluted Drill Bit

Is this a special drill bit or a fluke?
I think it's a Rotazip bit, intended for drilling into sheetrock (gypsum board) and then acts as a rotary file for sideways cuts.
Goes kinda fast, and it's too floppy for more robust materials. Makes good rectangle holes for outlets, though, quickly.
 

Superburban

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#20
@Superburban Thanks!
I had never seen those up-cut/down-cut router bits before, you taught me something new.

Here's a couple references:
What the heck is a compression router bit?
Compression Spiral and Spiral Solid Carbide Router Bits

Apparently often used for CNC routers in MDF and plywood to reduce splintering and tear-out on BOTH faces.

Although they do not look like the pictures from the start of this thread.......those just look like poorly made drill bits that got jammed and then "rearranged" themselves.....

-brino

Yea, I knew they did not look the same. But on closer look, it is interesting that the original has the flutes change direction twice. The first change has both cutting edges cutting outward, which generally will create more splintering. Also does not look strong enough to cut anything more then Styrofoam, without breaking.

Even if you got it red hot, I think It would take some careful work to get the twisting, without the outer web of the flute cracking.

I wonder if it is one of those things a machinist does when he has spare time, and an inquiring mind. Or even something created by a drill maker, as a novelty.
 
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