Finally started on my little CO2 V8 by machining the block first. Had it looking just like an engine block and was really excited with the results. Turned it over and began milling the underside for the bearings when for some reason unbeknown to me, instead of turning the Y-axis wheel, I released the vise clamp which resulted in the engine block being tossed right out and breaking my end mill. Both are ruined due to a simple laps of concentration! A bit too heart broken to start on anothr block just yet.