Thanks guys, until I get the kinks worked out, the granite milling is (for entertainment purposes only) 🙂
David, yep that's 24,000 rpm for the finishing pass with this bit.
Diamond 40 Degree PCD Cutter (3683)
https://www.amazon.com/dp/B075BHLWBT/ref=cm_sw_r_cp_apa_i_TVKJCbWH3ZXAW
The roughing pass is 18,000 rpm with this bit.
Diamond Sintered Router Bits Straight Finger Burs for Granite Stone (C)
https://www.amazon.com/dp/B07J1VYJJG/ref=cm_sw_r_cp_apa_i_VyLJCbKNBN4N4
Cutting submerged is my only option for now but from my research, everyone is using water cooling like this one so I'll be rigging it up soon. That way I can see what's going on instead of just looking at a tub of muddy water and wondering... 🙂
OriGlam Mist Coolant Lubrication Spray System
https://www.amazon.com/dp/B071DXGGP4/ref=cm_sw_r_cp_apa_i_JeLJCbYHEHJJP
I saw a lot of feeds and speeds recommending 10-15 inches per minute so that's where I started but with the 6% stepover, that was gonna be about a 26 hour horse. 😞 and not worth doing. So I bumped everything way up to 12% stepover and 120 IPM
and finished the horse in 2.5 hrs. I think I can get it down to an hour without breaking anything but we'll see. 🙂