Engraving bit for granite?

[Davo]

I normally use a diamond drag bit but it wears it out so fast is there a smaller engraving bit that would work ?

[Davo]

If not granite, marble also

[steve_g]

I’ve had modest success using a carbide V 60 bit in soft marble…
SG

[scottp55]

I found this one Davo.
http://www.talkshopbot.com/forum/showthread.php?12653-Engraving-marble&highlight=marble
I'm just worried about the dust on my machine, But Slate was kind of cool and AM going to try Soapstone and will just amp up DC.
If an American penny won't scratch it easily, I wouldn't try it. I've got some white marble that annealed copper electrical wire will scratch easily after I soaked it a week in water, but haven't tried it yet.