I was just relaying a positive experience and something to think about when purchasing a 1st or second or third machine.So you want to turn it around as to what it couldn't do and then put your product forward as a winner im guessing and googleing that your a dental supply company.so ill ask you this with the imes icore can you still mill if the spindle breaks down.From my experience all the cam software zz sum 3d and vhf are fine just different.I will still stand by my earlier statement that its best to outsource your emax milling as wet milling is much harder on the machine because of moisture no mater how well everything is waterproofed.Just look at the servicing costs of sirona machines. .
The OP asked about a mill that could successfully mill glass ceramics and hence my reply. It's great to hear that you are happy with Zirkon Zahn, that's why I was curious if the VHF offer any benefits over your existing system, in your opinion. In terms of spindle break down, no, you can't continue milling on an imes however, I guess we are not comparing apples and apples here with a 100W spindle (ZZ M5) vs 1000W (450i) so I would expect a different lifetime.
I see no issues milling glass ceramics in production provided your system in designed to do so, however, I would be hesitant to continuously move between wet and dry as it would impact the lifetime of the spindle.
Hence a setup with dry
and wet mill would be ideal e.g. Dry Zirkon Zahn: Zirconia, PMMA, Wax, Wet Imes-icore: glass ceramics, titanium, cobalt chrome) - All run by the same CAM for ease of use (SUM3D).