Best drill bit for stainless steel

[Jamie Leask]

I need to drill out a 32mm hole in a stainless steel bar (4 - 6mm) What is the best type drill bit for a normal combi 18v drill.

 

[ShaunCorbs]

Tct but you can make do with a bi metal hole saw and some cutting oil but speed 1 and take your time prob around 20-30 mins a hole

 

[centralheatking]

Tct but you can make do with a bi metal hole saw and some cutting oil but speed 1 and take your time prob around 20-30 mins a hole

Hss very slowly with plenty of oil start off with a small dia and work your way up to about half dia, then go for it , nice new sharp drill loads of oil. How many are you doing ? there are electro magnetic type bench drills you can hire for site work. centralheatking

 

[Jamie Leask]

Tct but you can make do with a bi metal hole saw and some cutting oil but speed 1 and take your time prob around 20-30 mins a hole

Ok cool thanks I like the sound of this. So basically a hole saw but for metal instead of wood, and then you get different sizes instead of just one.
[automerge]1576523289[/automerge]

Hss very slowly with plenty of oil start off with a small dia and work your way up to about half dia, then go for it , nice new sharp drill loads of oil. How many are you doing ? there are electro magnetic type bench drills you can hire for site work. centralheatking

mate it’s just one for a monobloc tap.

 

[ShaunCorbs]

Ok cool thanks I like the sound of this. So basically a hole saw but for metal instead of wood, and then you get different sizes instead of just one.
[automerge]1576523289[/automerge]

mate it’s just one for a monobloc tap.

Yes will be listed as bi metal go Bosch or starrett

Get two not just one incase you hit a hard spot

 

[Jamie Leask]

Yes will be listed as bi metal go Bosch or starrett

Get two not just one incase you hit a hard spot

Yip Ill

Yes will be listed as bi metal go Bosch or starrett

Get two not just one incase you hit a hard spot

have you ever used a step drill , this type of thing. No idea if it’l just melt

 

[ShaunCorbs]

Not on thick stuff max I would go is like 2-3mm any more it doesn’t fully work you have to do it both side etc

 

[rpm]

Do not try a step drill with stainless steel, use the correct size drill and take one slow go at it.

 

[gmartine]

Not bad for £12 if you have a RS nearby, the right sized hole saw (if you dont have one) will cost near enough the same.

RS PRO Tungsten Carbide Tipped 32mm Core Drill Bit | RS

uk.rs-online.com