From: muratlanne@gmail.com   
      
   "Gerry"  wrote in message news:kpk3hj9jfrq2m2q0l5u5k984ut158a7t2b@4ax.com...   
      
   I totally broke Junior's FiL when he sent in a basket of bits for me   
   to sharpen - among them was a 1/2" concrete bit with the insert   
   missing. I sent it back nicely sharpened with a hole drilled through   
   the web and a tag wired to it saying "Drill shaped object - Use only   
   to make holes in room temperature butter"!   
      
   ---------------------------   
      
   The most recent drill-shaped object I made was a small hole saw from 3/16"   
   gas welding rod, to free the broken tip of a #1 center drill so I could   
   finish the #8-32 tap hole through the otherwise tediously completed aluminum   
   part. The filed teeth needed several resharpenings to keep the chips flowing   
   but it did the job.   
      
   The holes are for setscrews and pins that can push out pressed-in bearings.   
   The parts are bandsaw blade guide rollers similar to this, but minus the   
   sawdust grooves because a scraper of aluminum flashing cleans the blade   
   ahead of them, and the blade back support is a separate bearing on edge   
   instead of the flange.   
      
   https://cookssaw.com/parts/roller-guides/   
      
   The prototype aluminum rollers wore enough that I made a steel pair. The   
   blade runs at 50-60MPH which is hard on the guides and their bearings, not   
   far from the PV limit of a good bearing and beyond it for some cheap ones   
   from Amazon, or the smaller skate bearings I used before. The ball cages   
   break, pop the seals off and sawdust jams them or the balls fly out. The saw   
   keeps cutting but not as straight.   
      
   A safety pin (on my key chain) can remove the rubber seals or metal shields   
   from ball bearings to clean and grease them. Shields are retained by a   
   spring clip at the outer edge that the pin tip can catch the inward beveled   
   end of and pop it out of the groove. Both reinstall without tools after some   
   practice.   
      
   When I changed phone carriers the clerk couldn't find his tool to unlatch   
   the SIM card and asked me if I had one (yeah, right). To his surprise I   
   handed him the safety pin which worked fine.   
   jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)