Half-Round, Round bur for Cabochon Settings => 10 photos

These 'half-round' shaped burs were designed just for one purpose and that was to create a seat within a tube setting.

 In this photo you can see that the bur teeth are still so very sharp. Still so sharp that the teeth can easily cut your skin. 

 I place the bur against a rotating Emery wheel on your bench grinder. This bur should be held the Emery wheel and keep it water cooled at all times. 

  As you can see that there has been some overheating of the rotating bur and a mild discoloration ensued.

 If the bur hasn't been kept water cool, the bur could become useless for long term cutting.

 

  In my bur inventory, I keep a full set of round burs for future Cabochon Setting needs.

 It is easy to see that all of these burs still retain the toothed edge just for Tube Settings.                                                            

 When, and if the need arises that I need a specific size, I have a sharp 1/2 round bur without any guessing at the last moment, "Do I have one?"

 This is the reason for these odd-looking round burs. The shape of the 1/2 round bur will the same as a Cabochon stone. All that is needed is to decide how deep the bur will be in the Tube Setting.

 

 The gentle angle of this bur is held to help create a seat inside the Tube Setting. 

 When the finished seat for the Cabochon has been completed, it appears apparent that the depth of the bur will still have enough metal to hold the stone.

 

 I will always have a supply of 'half-round burs' sitting near my bench-peg for continuous Tube Cutting. 

  This is exactly how the half-round bur looks prior to any bench-grinder shaping. You will notice how sharp the teeth are at this point.

 If they get worn, the teeth will lose their sharp edges and function as a gemstone setting tool.