Dormer centre drill grind – effective or defective?

[Bill PhinnParticipant @billphinn90025]

ETA: The thread title is meant to end with a question mark, but I can't edit one in.

I've just bought a set of 5 Dormer centre drills from RS Components. Being a curious type I got my 10X loupe out to compare the tips of my existing non-branded centre drills with those of the Dormers.

There didn't seem much difference in their tip profiles until I got to the smallest of the Dormers (BS1). One end of it looked like what I expected it to look like but the other had what looks to me like a defective grind on it.

I'd be grateful if people could share their views on whether the drill is faulty or not. I've added images to this post of both ends of the drill. I'm not sure what order they'll appear in.

Edited By Bill Phinn on 22/08/2018 16:55:30

[Bill PhinnParticipant @billphinn90025]

[Tony Pratt 1Participant @tonypratt1]

Bottom one has not been ground correctly.

Tony

[Richard S2Participant @richards2]

Yep!, you've been sold a reject there it seems

[Bill PhinnParticipant @billphinn90025]

Thanks for the replies.

While we're at it, I'd be interested to know whether anyone else has ever received a defective Dormer centre drill. Since my existing batch of unbranded centre drills were a sixth of the price of the Dormers and had no obvious faults, it's a bit dispiriting to find that an upgrade in price has entailed a downgrade in quality.

Maybe I'm just unusually unlucky. On second thoughts, you can delete the first word in that sentence.

[larry phelan 1Participant @larryphelan1]

I have bought center drills from Chronos and other suppliers and never came across one like that.

Since it is Dormer,and priced as such,I would send it back. I suspect that this was just one that slipped through the net,but still,it,s no use to you.

I think Dormer will be only too happy to replace it for you.

[Tim StevensParticipant @timstevens64731]

I just wonder if they were ever anything to do with Dormer …

I hope that's just me being cynical, but somehow I doubt it.

Cheers, Tim

[Neil WyattModerator @neilwyatt]

Posted by Tim Stevens on 22/08/2018 17:59:41:

I just wonder if they were ever anything to do with Dormer …

I hope that's just me being cynical, but somehow I doubt it.

Cheers, Tim

I'd be very surprised if RS were passing off goods.

Neil

[Michael GilliganParticipant @michaelgilligan61133]

It is interesting [and perhaps worrying] to note that the illustration on the 'datasheet' shows a different package to the one on the 'product listing'.

That said "Manufactured to BS328" is a pretty clear statement.

… A refund is the very least that should be expected !!

MichaelG.

.

https://uk.rs-online.com/web/p/products/0694481/

https://docs-emea.rs-online.com/webdocs/1388/0900766b813883eb.pdf

 

 

Edited By Michael Gilligan on 22/08/2018 18:41:15

[jimmy bParticipant @jimmyb]

Its not unheard of to get "duds"!

At work, we've had a fair few over the years.

Jim

[Bill PhinnParticipant @billphinn90025]

The drills came packaged very nicely in the red box depicted in your first link, Michael.

I've spoken to RS, and they've obligingly offered to send out a new set free of charge.

[Michael GilliganParticipant @michaelgilligan61133]

[Bill PhinnParticipant @billphinn90025]

Posted by Michael Gilligan on 22/08/2018 19:22:41:

I spoke to RS at 6pm yesterday. Replacement set (AOK) arrived 11am today.

👍👍

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