From: djb@invalid.com   
      
   On 27/03/2025 07:52, Richard Smith wrote:   
   > "Jim Wilkins"  writes:   
   >   
   >> "Richard Smith"  wrote in message news:m134f1egx2.fsf@void.com...   
   >>   
   >> Gerry  writes:   
   >> ....   
   >>> On Sun, 23 Mar 2025 18:13:23 -0400, "Jim Wilkins"   
   >>>  wrote:   
   >> ....   
   >>   
   >> ...   
   >>   
   >> More than one turn of rope on the drum will walk sideways.   
   >> ...   
   > I didn't know that.   
   > That's why capstans/windlasses have a concave "waisted" shape - so the   
   > rope stays central, being unable to "climb" the taper?   
   > How does a "traditional" lathe work - a pedal-plank, a string with   
   > round-turn around the wooden piece beign turned, an a lath above to be a   
   > spring?  The string "walks" back-and-forth "sideways"?   
   > Thanks,   
   > Rich S   
      
   On a traditional pole lathe of that sort the string does walk back and   
   forth but as it only does a few turns before reversing it effectively   
   stays in one place and in use the bodger may reposition it to get access   
   to different parts of the piece being turned.   
      
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