Re: Steel excavator build
			 
			 
			
		
		
		
			
			It's practical to build the 'engine house' cover as 1 big piece, that is easily removable for good access. One can have separate smaller hatches/doors in the main cover. 
Track sprocket wheels should run about 30-40 rpm. Superstructure to rotate about 10 rpm. 
Looking at your sketch, I would maybe get some more clearance between the tracks and the bottom of 'engine house'/superstructure, like double it?
		 
		
		
		
		
		
		
		
		
	
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