• We want to wish everyone a healthy, happy New Year, full of joy and success. God bless you, and thank you for supporting The Hobby-Machinist.

[4]

Funny Fluted Drill Bit

[3]
[10] Like what you see?
Click here to donate to this forum and upgrade your account!

azshadeguy

Active Member
Registered
Joined
Jul 16, 2017
Messages
69
Likes
31
#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

Active User
H-M Supporter - Gold Member ($25)
Joined
Dec 27, 2014
Messages
2,793
Likes
2,135
#2
That had to be made on purpose, I wonder what the purpose was...
 

Tony Wells

Platinum
Registered
Joined
Jan 22, 2011
Messages
7,052
Likes
2,135
#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

Brass
Registered
Joined
Mar 12, 2018
Messages
587
Likes
612
#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

Brass
Registered
Joined
Mar 12, 2018
Messages
587
Likes
612
#5
You beat me to it Tony.
 

Tony Wells

Platinum
Registered
Joined
Jan 22, 2011
Messages
7,052
Likes
2,135
#6
Not by much, Caddy. ;)
 

BtoVin83

Active Member
Registered
Joined
Aug 30, 2017
Messages
190
Likes
182
#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

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Jan 11, 2016
Messages
256
Likes
140
#8
Drill bit to drill Maple trees for sap?
 

azshadeguy

Active Member
Registered
Joined
Jul 16, 2017
Messages
69
Likes
31
#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

Active User
Registered
Joined
Nov 10, 2013
Messages
759
Likes
666
#10
I have one similar somewhere in the shop. I haven't seen it in a few years.
 

Superburban

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Jan 2, 2016
Messages
630
Likes
456
#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

Active User
H-M Supporter - Gold Member ($25)
Joined
Jun 5, 2013
Messages
484
Likes
284
#13
Really ,never seen or heard of such of a bit like that.
Ron in ohio
 

ELHEAD

Active User
H-M Supporter - Gold Member ($25)
Joined
Feb 13, 2014
Messages
259
Likes
201
#14
Looks identical to a couple of H F brand bits after first use.
Dave
 

killswitch505

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Nov 10, 2013
Messages
322
Likes
315
#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

Active Member
Registered
Joined
Jan 6, 2018
Messages
94
Likes
90
#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

Active User
H-M Supporter - Gold Member ($25)
Joined
Jan 2, 2014
Messages
3,461
Likes
3,487
#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

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Feb 1, 2015
Messages
3,684
Likes
4,288
#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

Active Member
Registered
Joined
Mar 3, 2017
Messages
354
Likes
198
#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

H-M Supporter - Gold Member
H-M Supporter - Gold Member ($25)
Joined
Jan 2, 2016
Messages
630
Likes
456
#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.
 
Last edited:
[6]
[5] [7]
Top