Countersinking brass - what drill bit?

[Cheshire cat]

This does the job. £10.00 for one bit seems steep but you get what you pay for. I used it to countersink holes in brass for the slide runners. It also works well on steel.

 

https://www.amazon.co.uk/Draper-19235-16MM-Rose-Countersink/dp/B0002BUJ3U/ref=sr_1_16?keywords=steel+countersink+draper&qid=1554117257&s=diy&sr=1-16

 

The trick is to use it at slow speed which allows the cutting edge to cut rather than hop.

[Morlulon]

Not so long ago, I was choosing a drill for a hard surface. And since I am a novice, I have many questions and difficulties. I received a lot of advice from friends but have not yet decided on the choice. My search led me to сountersink bit sets IRWIN Tools 1877793  https://drilling-it.com/best-countersink-bit-sets-reviews/ share my little experiences, maybe this information is useful to you.

[WotEver]

2 hours ago, Morlulon said:

Not so long ago, I was choosing a drill for a hard surface. And since I am a novice, I have many questions and difficulties. I received a lot of advice from friends but have not yet decided on the choice. My search led me to сountersink bit sets IRWIN Tools 1877793  https://drilling-it.com/best-countersink-bit-sets-reviews/ share my little experiences, maybe this information is useful to you.

Sadly the Irwin bits don’t appear to be available in the UK. Several US sellers on eBay but the postage costs are high. 

5 hours ago, Cheshire cat said:

The trick is to use it at slow speed which allows the cutting edge to cut rather than hop.

The same when countersinking wood. 

[starman]

On 31/03/2019 at 22:55, ditchcrawler said:

Do people still do that

Yes. 

[MtB]

20 hours ago, Morlulon said:

Not so long ago, I was choosing a drill for a hard surface. And since I am a novice, I have many questions and difficulties. I received a lot of advice from friends but have not yet decided on the choice. My search led me to сountersink bit sets IRWIN Tools 1877793  https://drilling-it.com/best-countersink-bit-sets-reviews/ share my little experiences, maybe this information is useful to you.

 

 

Interesting to note from your link that countersink bits are 82 degrees, not 90 as I previously imagined. 

 

 

[ditchcrawler]

According to Wiki you are all right https://en.wikipedia.org/wiki/Countersink

Edited April 2, 2019 by ditchcrawler

[BEngo]

UN Series threads are 82 degree countersunk.   BA, BSW/F and  SI Metric threads are 90 deg countersunk.

 

N

 

[WotEver]

2 hours ago, BEngo said:

UN Series threads are 82 degree countersunk.   BA, BSW/F and  SI Metric threads are 90 deg countersunk.

How about Chinese screws?

[RLWP]

22 minutes ago, WotEver said:

How about Chinese screws?

[WotEver]

I’ve got some magnetic Chinese brass screws that go rusty... they’re very special. 

[rusty69]

2 minutes ago, WotEver said:

 go rusty... you're very special. 

Gee, thanks WotEver!

[TheBiscuits]

4 minutes ago, rusty69 said:

Gee, thanks WotEver!

We often think of you as being "special."