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SOLID CARBIDE DRILLS User Guide
Regrinding Instructions for DBC21 / DBICT21 Pre-Thread Solid Drills
For each grinding operation, rotate the drill
180° and repeat the grinding procedure.
45°
7°ÊspiralÊrelief
Primary Clearance
1
a° D Range
7 0.8-6.0
10 >6.1
Secondary Clearance
2
Chisel
3
a° D Range
100 3.0-4.8
105 4.9-10
95 10.1-20
Edge Preparation
4
R D Range
0.02 0.8-6.0
0.03 6.1-18.0
0.04 18.1>UP
Grinding Wheel Recommended Specifications: 3. Grit size: 325/400 mesh (45/38µ)
1. Diameter grinding wheel: GA2 4. Diamond concentration: C-75 (3.3 carat/cm3)
2. Grinding wheel bond: synthetic resin 5. Cutting fluid emulsion 3%
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