Drill Bits

[VicParticipant @vic]

I wonder what these Carbide drill bits are like? Set of four on places like eBay for about £6.

[Brian WoodParticipant @brianwood45127]

I haven’t seen ones like that before, but from the design I suspect you need high speed drive, heavy pressure and sturdy equipment to be able to bore your way through by heating, eg melting the hole rather than drilling it.

Others may know better

Brian

[JasonBModerator @jasonb]

They are meant more for stone, ceramic, composite etc which they work like any other spade type bit. Only difference is they put a bit of a helix on the shank which being smaller than the carbide tip’s diameter won’t do a lot to help clear dust from deep holes.

The 1/4″ hex shanks are likely to be used in cordless drills so no need for heavy equipment.

[Ian PParticipant @ianp]

Those look weird!

If the tip, (which appears to have no cutting edges) is carbide and relies on extreme pressure to create a hole, why would it have flutes I wonder.

Not enough info in the image to really identify what the drills are.

 

Ian P

[JasonBModerator @jasonb]

better pics of similar bits in this or this listing

[Ian PParticipant @ianp]

I did some searching before I replied earlier but could not find any that looked like the one Brian showed.

Now, having looked closely at the picture I can see an outline lighter shaded bullet shape which I originally thought was the blister packaging.

IMHO the drills are ideal exhibition demo fodder, although I am sure they will work (to an extent).

Ian P

 

[Michael GilliganParticipant @michaelgilligan61133]

Well … they even claim to be ‘Eccentric’ !!

https://www.ebay.co.uk/itm/305426205545

MichaelG.

[Ian P]

On Ian P Said:

Those look weird!

 

 

Ian P

Yes, that’s what I thought.

[Nigel Graham 2Participant @nigelgraham2]

Apart from very high cone angles the e-Bay advertisement suggests their cutting-edge geometry is not ever so different from any masonry drill: no rake and shallow clearance. They scrape rather than slice the material.

Odd-looking flutes too, though I don’t think their outer diameter is much less than the tip diameter. It is hard to tell from the heading photo.

However, I won’t be rushing to buy any.

I remain Sir, Yours Unconvinced….

[VicParticipant @vic]

Also available without the flutes in Blue! 😆

[Vic]

On Vic Said:

Also available without the flutes in Blue! 😆

 

Or fluteless as I would call them! (shades of Atkins’s ‘doctors in training’)

Ian P

[JasonBModerator @jasonb]

As I said really no different to the traditional spade type tile drill. Which work well on certamic tile, slate, marble, linestone etc. I use them for work without problem. All they have done if put fancy flutes on them and made the shanks so you can use them in an impact driver or cordless with quick change.

 

[Michael Gilligan]

On Michael Gilligan Said:

Well … they even claim to be ‘Eccentric’ !!

https://www.ebay.co.uk/itm/305426205545

MichaelG.

Lots of other ebay ads for these say the same. Can’t get my head around ‘eccentric’ drill bits, although if you search the web seems a common term in drilling parlance, but appears to be more related to pipes and heavy duty stuff for oil wells. Anybody got any ideas? Or is it simply a translation error somewhere along the line that has propagated through?

[VicParticipant @vic]

Another variation with four cutting edges.

[Mike Hurley]

On Mike Hurley Said:

On Michael Gilligan Said:

Well … they even claim to be ‘Eccentric’ !!

https://www.ebay.co.uk/itm/305426205545

MichaelG.

Lots of other ebay ads for these say the same. Can’t get my head around ‘eccentric’ drill bits, although if you search the web seems a common term in drilling parlance, but appears to be more related to pipes and heavy duty stuff for oil wells. Anybody got any ideas? Or is it simply a translation error somewhere along the line that has propagated through?

On brief inspection, it looks like it’s one seller with multiple accounts, or only a handful of sellers all using the same cut-and-pasted text and selling broadly similar products.

The text, as well as the seller’s understanding of their product, gets even more “eccentric” when you look at what they say in the actual listings:

“This Crooked Drill Bit is made of high-speed steel, which is designed for drilling in wood, plastic, and metal. It is used to thread the inside of a hole, creating a female thread that can accept a mating male thread. The Crooked Drill Bit is a type of drill bit that has cutting edges at the tip and along the flutes, which are used to cut the threads. It is used in conjunction with a hand drill or electric drill to machine threads.”

To me, the use of the words “eccentric” and “crooked” with “drill” suggests the seller may have been looking for the word “twist”.

Ultimately, can we have high expectations, or any at all, from a drill bit seller who also sells “pooping dog butt toothpaste toppers” on the same platform?

[Mike HurleyParticipant @mikehurley60381]

“pooping dog butt toothpaste toppers”- Unbelievable!

 

[peak4Participant @peak4]

I would have a guess that the multiple account scenario is likely drop shipping

https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/drop-shipping?id=4176

Bill

[Michael Gilligan]

On Michael Gilligan Said:

Well … they even claim to be ‘Eccentric’ !!

https://www.ebay.co.uk/itm/305426205545

MichaelG.

Oddly, I’ve just had a link to this style pop up on my Facebook feed, pointing to a .co.uk website
I’m guessing that the eccentric part of the description refers to the point, which, unlike normal spade glass drill, does seem off-centre/
The descriptions remain a little quaint though; also mentions high speed steel, though I’m sure they mean some sort of carbide.

High-strength eccentric twist drill bit

[Mike HurleyParticipant @mikehurley60381]

21 reviews only, all 5 star!

Nothing iffy there then?

[Author]

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