The new toy in action!

 

It's called a surface grinder - a CN machine which grinds down metal surfaces to be perfectly flat and level. The machining process is abrasive: a diamond grinding wheel which is spinning at a high speed to grind away differences in height.  The end result is a perfectly flat piece of metal. In watchmaking, surface grinding is essential for both tool making and parts manufacturing.  Here is a quick 30 seconds video of Josh explaining the grinding process. Yes, once again, we are talking microns -  https://www.instagram.com/p/CKSZ7Q1Jrd8/