It is currently 03 Mar 2024, 19:39

Sharpening countersink bits

This forum is for any general questions, queries or plain old chinwaggery on Woody stuff in general.

Sharpening countersink bits

Postby Mike G » 12 Feb 2024, 08:18

Is it possible? I've got almost a dozen countersink bits (I inherited most of them), and I have to try to remember which ones are sharp, and which ones chatter and produce a fluted hole. I'd like to sort them out one day. All I can imagine is it's a job for a dremmel, which I don't own.

If they're not sharpenable, what do you guys buy?
User avatar
Mike G
Sequoia
 
Posts: 9773
Joined: 30 Jul 2014, 22:36
Location: Suffolk
Name:

Re: Sharpening countersink bits

Postby toolsntat » 12 Feb 2024, 08:36

Hi Mike, I like to use one of the DMT card hones on the "engineering" 3 flute type.
Also very effective on router cutters.
If I was buying new it would have to be the same 1/2 parallel sided ones, as a bonus is, they leave perfect holes for wooden plugs.
Cheers.,Andy
toolsntat
Sapling
 
Posts: 292
Joined: 04 Apr 2021, 14:32
Location: Leicestershire
Name:

Re: Sharpening countersink bits

Postby Dr.Al » 12 Feb 2024, 08:41

Like Andy, I use a thin diamond card thing on the ones that have a flat surface behind the lip. The ones with the hole through the middle (like this) can allegedly be sharpened through the hole (leaving the cone alone), but I've never tried: I've only got one of them and it is still sharp!
My projects website: https://www.cgtk.co.uk
User avatar
Dr.Al
Old Oak
 
Posts: 1914
Joined: 31 Dec 2020, 10:11
Location: Dursley, Gloucestershire
Name: Al

Re: Sharpening countersink bits

Postby Richard » 12 Feb 2024, 08:45

Never bothered much trying to sharpen the type with six or eight flutes, if that's the type your talking about: you can touch them up a bit with a small triangular file.

I switched to snail countersink bits two or three decades ago for wood. There's plenty of choice online from about £10 upwards, and each one lasts for years of heavy use. Slainte.
Richard
New Shoots
 
Posts: 65
Joined: 25 Jul 2018, 20:21
Name:

Re: Sharpening countersink bits

Postby Weekend_Woodworker » 12 Feb 2024, 08:54

I bought a couple of countersinks like Dr Al’s picture from Wealdons (sp?) which seem to be good with no chatter and haven’t needed sharpening yet.


Sent from my iPhone using Tapatalk
User avatar
Weekend_Woodworker
New Shoots
 
Posts: 162
Joined: 03 Apr 2021, 21:27
Name: Mark

Re: Sharpening countersink bits

Postby Mike G » 12 Feb 2024, 09:19

toolsntat wrote:........If I was buying new it would have to be the same 1/2 parallel sided ones....


I can't picture this, Andy. Have you got a link?
User avatar
Mike G
Sequoia
 
Posts: 9773
Joined: 30 Jul 2014, 22:36
Location: Suffolk
Name:

Re: Sharpening countersink bits

Postby Eric the Viking » 12 Feb 2024, 10:53

Same as everyone else, but I'm lazy, so for a quick and dirty tune up, I run them backwards in a cordless drill against a fine diamond plate. Obviously this doesn't do the relief profile properly, but It's mostly good enough--and quick.

Regarding the snail-shell ones, I have an Axminster set that really isn't good enough to resharpen well (and usually only gets used for woodwork, anyway). The one decent snail-shell one I have (Rohm?) is hardened, and hasn't yet needed sharpening.
Eric the Viking
Sapling
 
Posts: 453
Joined: 10 Dec 2020, 21:34
Location: In the downstairs shower, trying to fix the leak.
Name:

Re: Sharpening countersink bits

Postby toolsntat » 12 Feb 2024, 11:50

Mike G wrote:
toolsntat wrote:........If I was buying new it would have to be the same 1/2 parallel sided ones....


I can't picture this, Andy. Have you got a link?


Difficult to find with a point now but here's mine.

20240212_104740.jpg
(263.57 KiB)
toolsntat
Sapling
 
Posts: 292
Joined: 04 Apr 2021, 14:32
Location: Leicestershire
Name:

Re: Sharpening countersink bits

Postby Cabinetman » 12 Feb 2024, 15:55

Granny’s eggs etc Mike, but if you countersink before you drill the hole the result is much better, chatterwise.
Ian
Cabinetman
Old Oak
 
Posts: 3144
Joined: 11 Oct 2020, 07:32
Location: Lincolnshire Wolds + Pennsylvania
Name: Ian

Re: Sharpening countersink bits

Postby AndyT » 12 Feb 2024, 17:40

I thought I remembered discussing this before and indeed, we did, back here
viewtopic.php?f=23&t=7114 and it's worth a look.

The photos had dropped off my post so I have put them back. For completeness, here's the sharp countersink in question in an exciting action shot up against a bit of old oak:

bbin141.jpg
(288.75 KiB)


and Mike, if you haven't got a suitable brace to go with such a bit, I'm sure something could be arranged!
--------------
Andy
User avatar
AndyT
Old Oak
 
Posts: 2335
Joined: 23 Nov 2020, 19:45
Location: Bristol
Name: Andy

Re: Sharpening countersink bits

Postby Mike G » 12 Feb 2024, 19:01

I've a couple of braces, Andy, but I haven't got a countersink bit designed for a brace. I do use the egg beater for countersinking now and then, though.
User avatar
Mike G
Sequoia
 
Posts: 9773
Joined: 30 Jul 2014, 22:36
Location: Suffolk
Name:

Re: Sharpening countersink bits

Postby SamQ aka Ah! Q! » 12 Feb 2024, 19:09

A pragmatist inside a perpetual optimist, heavily influenced by an experienced cynic, wrapped around an aging relic.
SamQ aka Ah! Q!
Nordic Pine
 
Posts: 962
Joined: 21 Jul 2014, 23:06
Location: High above the Aln.
Name: Sam


Return to General Woodworking

Who is online

Users browsing this forum: No registered users and 5 guests