Patent ID: 6890250

Claim:
A diamond blade ( 31 ) for grinding or cutting workpieces, comprising: a wheel body ( 32 ); and an annular rim type cutting tip ( 33 ) having a uniform rectangular-shaped cross-section, which is fixed to a periphery of said wheel body ( 32 ), said rim type cutting tip including: two diamond layers ( 38 , 38 ′) including diamond particles ( 39 ), which are longitudinally disposed parallel with rotation direction of said wheel body ( 32 ); and a non-diamond portion ( 35 ) disposed between said two diamond layers ( 38 , 38 ′), in which said non-diamond portion ( 35 ) does not include the diamond particles ( 39 ); whereby said two diamond layers ( 38 , 38 ′) form microscopic cutting grooves ( 37 , 37 ′) within the workpieces ( 37 ) during grinding or cutting operation and said non-diamond portion ( 35 ) crushes portion ( 40 ) of the workpieces ( 37 ) between the microscopic cutting grooves ( 37 ′, 37 ″) into a relatively larger size as said non-diamond portion ( 35 ) applies a relatively small friction and a rotation impact to the portion ( 40 ).