Drilling 95% Tungsten Darts

[TomG]

(12-16-2018, 08:46 AM)Wongster Wrote: Thank you, Tom.  I've not done grey iron before.  Given that I'll be using a 3mm drill, what's the recommended speed?

I'll visit the hardware shop near my office tomorrow to see if I can pick up a couple of carbide drill.

Regards,
Wongster

Even at a conservative 200 sfpm, a drill that small in carbide could be run at 6000-7000 rpm. Slower is ok for drilling because it doesn't increase the side load as with an end mill.

Tom