The speed ratio qd between the surface speed of the rotating diamond dressing tool and the surface speed of the CBN wheel (qd = (VR / Vc) should be as follows:
Synchronous: 0.8
Asynchronous: -0.5 to -0.8
The relative dressing direction between the dressing tool and the grinding whee! brings to bear a lot of influence on the resulting grinding wheel surface roughness, and therefore, the cutting ability of the grinding wheel.
Synchronous: high metal removal rates
Asynchronous: fine surface finish
Size of dressing diamonds
The dressing diamond grit size should be three to four times larger than that of the CBN grit size:
CBN grit size B91 (170/200) = diamond grit size D301 (50/60)
CBN grit size B126 (120/140) = diamond grit size D427 (40/45) |
