The Boride CS-HD 220 grit is one of the roughing stones in the CS-HD series that follows the 150 grit stone and serves to remove scratches from the previous stone. The average grain size in the sieving in this bar is about 60 microns. Therefore, this stone is recommended to be used at the end of the roughing stage to complete the initial formation of the knife approach, regrinding, repair (for example, removing notches) and other operations that require the removal of a large amount of metal. The recommended grit for the 220 grit step following the Boride CS-HD stone is 320 grit (ANSI) Boride CS-HD.
The Boride CS-HD series is one of the few whetstone series produced by Boride that is based on silicon carbide grit. The Boride CS-HD series has a medium-hard bond and, thanks to the silicon carbide abrasive grain, works equally well with both carbon and chromium, high alloy and powder steels. The Boride CS-HD series has extended recommendations for the hardness of machined steels from the hardest knife steels to fairly soft stainless steels.
The Boride CS-HD series works with both oil and water coolants, however, since the Boride CS-HD series of whetstones is not impregnated, i.e. the inter-abrasive space is not filled with a special composition that prevents the products of processing from getting stuck between the particles of the abrasive (loading). The lubricating fluid during operation penetrates into the stone. To improve stock removal performance and comfort, it is recommended to use low density cutting fluid, water, or specialized cutting fluid from Boride Bori-Lube, in this case, as a rule, it is preferable to oil. The leveling of the bar is carried out on glass, on silicon carbide powder. During operation and when cleaning from salting, the use of household detergents is allowed. The Boride CS-HD series machine equally well, both hard tool and carbon steels, and soft chromium steels. The Boride CS-HD range of whetstones includes whetstones with an abrasive capacity of only the roughing range of 120, 150, 220, 320, 400, 600, 800, 1000, 1200 grit in various form factors - 152x25x6mm (6”x1”x1/4” ), 152x12x6mm (6”x1/2”x1/4”) and 152x25x12mm (6”x1”x1/2”).
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