Hi Sam, the 1.8kW designation in the D5's liquid-cooled Jager spindle is for continuous power, not maximum. Some spindle companies use max power to name or identify their products, and some use continuous power, like Jager.
However, what's much more important than spindle power is the actual performance relative to your specific application - in this case, titanium implant parts. I've never seen the power consumption of the D5 spindle go over 24% milling titanium bars or implants. In fact, it usually hovers around 14-16%.
Another indication of a spindle that's properly (or improperly) spec'd for a particular application is its bearing wear. There's a vibration measurement device we use whenever performing preventative maintenance on any of our machines (dental or industrial) that indicates the level of wear on a machine's spindle bearings. We have a customer with over 6500 hours on their 1.8kW D5 spindle that ONLY mills titanium implant parts at their facility (about 90% bars). After the last test at this particular customer, the results revealed a wear amount that was practically negligible... after 6500 hours! That's more than triple the manufacturer's warranty period.
Regarding D5 references, we have a few customers in the US that would be more than happy to talk with you about how they're using the D5, the level of service that Datron provides, and how the machine has revolutionized their business' capabilities, and more importantly, their profitability. Shoot me a PM if you'd like their info.
Thanks!