From: none@none.com99   
      
   On 10/18/2024 4:55 AM, Jim Wilkins wrote:   
   > "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   
      
      
   I tried to make a tiny hole saw to cut out rusted and broken steel   
   screws galvanicaly bonded into aluminum sheet last year... maybe the   
   year before.  It was a work of art, until all the teeth sheared off   
   instantly on the first screw.  Then I did what I should have done in the   
   first place and picked up the plasma cutter.   
      
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
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