Which bur will you use "HSS", or "156c" ? => 18 photos

  "HSS" bur is another correct name for "High Speed Steel".

 The letter 'C' in "156C" refers to the softer Carbide steel. I've mentioned this reference name a few times in previous essays.  

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  These '156C burs' are also named 'bearing cutters'. In which the angles of the cutting edges are 45degrees instead of the regular 90degrees.

  Not like the "HSS" burs, can these be repaired if they get worn down? The teeth of the "156C" are in close proximity to each other, which does not allow any opportunity to be repaired.

 These burs, under 'normal situations', will last for months. They can be repaired by resharpening the teeth on a regular basis.

There are an estimated 45 burs to a 'full set'. This is for preparing claws of various sizes of gemstones. The sizes of burs start at 0.03 mm and go up to 10.00 mm (or larger)!

 Here in this photo are two burs of two pavilion depths, each of which has multiple uses. 

 Hence the difference in proportions. The thin bur is used just for 'bearing cutting', the thicker bur prepares the Pavilion Facet.

 In this remarkable upclose photo, you can see the extreme edges of the teeth, which are getting 'rounded' by constant metal cutting. I use a 'Separating Disk'  to cut into the teeth, one at a time.

  As these teeth look the same, I will use a 'dark, marking pen' this will distinguish one tooth from the other.

 The cutting disk will recut each of the teeth. This process will rejuvenate the longevity of the bur.

As each bur tooth is being reshaped, it is reclaiming the 'cutting life' of this bur.

  Here is a wide assortment of 156C burs of 'medium-sized' burs. As many of these burs are showing signs of wear, they cannot be repaired. The reason why is that the teeth are too close to each other. The only solution is to discard the bur, plus the teeth are not as deep as the HSS bur, 'goodbye'.

 The price of these 156C burs is not as expensiveas the HSS burs, trust me!

 These burs should be immediately discarded if and when the teeth get badly worn and become useless.

 The only minor problem is that after every tooth repair, the size of the HSS diminishes slightly.

 Examine the width of the teeth from the large size bur to the smaller bur.

 I KEEP ALL OF THE 'HSS' BURS IN THEIR SEPARATE DISPLAY BOXES. I have 4 boxes for my (expensive) burs, each box determines where these different sizes will be kept.

 These are the boxes of 156C burs for my inventory. I keep them from touching each other and maintain the sizes in these plastic boxes.

  This HSS bur is a good candidate for reclaiming, asap. Every tooth has become 'rounded' and can no longer cut metal.

 From this 156C bur to the above HSS bur, you can now see the difference in both the tooth depth and size.