I am dry milling the concrete backing off a mosaic (1.25 inches thick) and cannot use liquid coolant. I do have a venturi tube blowing lots of cold air to help remove the dust and cool the bit somewhat.
I have had some success using diamond ball nose bits of a 40 grit and a trochoidal toolpath.
I was wondering if, instead of a diamond bit (I've used both sintered and brazed), I used a standard AlTiN coated end mill. The diamond bits grind as opposed to cut, but I wondered if the AlTiN coating is strong enough to withstand taking tiny chips off the concrete. It certainly would be good in the high heat department, and is supposed to be really good against abrasion. But it just seems odd to try a cutting surface on such a material.
Anyone every try burying a AlTiN or CVD diamond coating into something similar (rock, hard ceramic, concrete)?
Did it work or did to just break your bit straight away?
For future note, don't try it unless you want to see what color carbide is when it melts
went at the same speed/rate at which I was feeding the diamond brazed end mill, made it about 5 seconds and then lit up like a christmas tree.
Live and learn