Drill Bits

[SBK]

Can anyone recommend some decent drill bits for use on stainless ?

cheers

 

[Shox Dr]

The subject was recently discussed, a quick search will find it

 

[brightspark]

Can anyone recommend some decent drill bits for use on stainless ?

cheers

dormer presto sherwood guhring hss. slow speed steady pressure and cutting compound wil drill no probs atall

 

[Lawnmowerboy]

The main thing to remember that a lot of people do they think more revs equals cutting. A good feedrate with plenty of coolant or compound and the right revs will be ok. Especially with stainless if you let the drill rub without cutting you will blue the drill bugering it and work harden the surface which will be an absolute ****** to get through with even a carbide drill.

 

[SBK]

Ahh see where i been going wrong !too fast and too much pressure.
Is there a sensibly priced sharpener available.

 

[hotrodder]

You probably already one- a bench grinder. There's various guides and vids on the interweb and it takes a little practice to get results that aren't wonky

Too fast, yes. Too much pressure, not so much- as said if the feed/pressure isn't kept up then the drill rubs instead of cutting and then the stainless workhardens, the drill overheats and it all goes wrong.

 

[Jim_gsxr1000]

Dormer stuff is usualy good

 

[langy]

The Dormer A002 is what I use and I work in stainless most if the time, it's a split point type, always use the correct speed and constant pressure on stainless otherwise you will blunt the drill cutting edge.
Don't centre punch stainless either it just hardens it.

 

[Lawnmowerboy]

We run cheapie HSCO (high speed steel+ Cobalt 5% ish) Made by COMAC. Only on smaller sizes sort of 3-9mm on the CNC mills and lathes and it will run nearly 200 parts before even rubbing the coating off on 316 stainless in a 40mm deep hole!

 

[SBK]

Thanks all for the advice will have a look about.