From: djb@invalid.com   
      
   On 18/02/2026 03:52, Snag wrote:   
   > I'm going to try my hand at brazing new carbide on some chipped and   
   > worn boring bars for my mill . I have 3 choices for heat source , O/A   
   > , TIG , or my induction heater . I also have a couple of choices for   
   > braze filler , phosphor bronze TIG filler , regular brazing rod , and   
   > silver solder if I can find mine . I also have some brass wire ,   
   > composition unknown and a few sticks of silphos , though I don't know   
   > if that will stick to steel . I also have both borax and regular   
   > brazing flux .   
   >   
   >  The plan is to heat and remove the old/broken insert , apply flux and   
   > a thin piece of brazing filler topped with a new carbide piece , and   
   > heat to brazing temp . After watching a couple of youtube videos it   
   > looks like I may need to hold the new carbide in place as it   
   > heats/cools , I'll probably use a piece of SS TIG filler for that .   
   >   
   >   I just realized that I can replace the carbide teeth on the face   
   > mill that came with my milling machine . I tried to sharpen the   
   > cutters on the lathe , turned out less than optimum . If I do that   
   > I'll use the indexing device I built for sharpening end mills to   
   > sharpen them . Might try that to even them up , might turn out I don't   
   > need to replace them right away .   
   >   
   >  Thoughts on heat source and filler selections ?   
      
   I don't know if regular brazing flux is going to do it, I use one   
   intended for brazing tips and stainless steel as it is formulated to   
   deal with the more tenacious oxides.   
      
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