From: muratlanne@gmail.com   
      
   "Jim Wilkins"  wrote in message news:vrmdsr$207r$1@dont-email.me...   
      
   >Hardwood end grain bearings held up for a while under light loading, they   
   >needed to be easily and frequently replaced.   
      
   The point of that rambling is that I could buy a good solution at   
   substantial expense or build an adequate one with basic machine tools,   
   without either my attempts at rotating machinery were necessarily   
   pre-industrial and largely made of wood, more models than practical   
   productive machines. The fit and alignment of shafts and bearings was the   
   main limitation. My only partial success was assembling small air   
   compressors before relatively inexpensive imported ones became available in   
   the 1980's.   
      
   The Holtzapffel series and "De Re Metallica" show the state and difficulties   
   of mechanical technology before Maudslay's precision lathe revolutionized it   
   in 1797. "English and American Tool Builders" describes the rapid progress   
   it enabled.   
   https://www.gutenberg.org/ebooks/72046   
      
   Some of the machine tools mentioned and shown in engravings are in the   
   American Precision Museum in Vermont. New England has also preserved some of   
   its early industrial heritage.   
   https://americanprecision.org/   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)